Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago. Technical Report No. 126

PINNGORTITALERIFFIK · GRØNLANDS NATURINSTITUT Tusass Connect Marine Route Survey report Seabed survey feasibility study in Nuuk archipelago Technical Report no. 126 Greenland Institute of Natural Resources Technical report no. 122, Greenland Institute of Natural Resources Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx Title: Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago. Authors: Karl Brix Zinglersen Aqqaluk David Sørensen Publisher: Greenland Institute of Natural Resources Date of publication: 11th April, 2023 Financial support: Greenland Institute of Natural Resources Tusass A/S Cover photo: R/V TARAJOQ near Nuuk in 2022. Karl Brix Zinglersen ISSN: 1397-3657 ISBN: 978-87-972977-9-7 EAN: 9788797297797 Web: https://natur.gl/forskning/rapporter/ Citation: Zinglersen, K.B., Sørensen, A.D., 2023: Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago. Technical report no. 126, Greenland Institute of Natural Resources, Greenland. ISBN: 978-87972977-9-7. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx Document: GINR Tusass Nuuk-AC61 Survey report.docx Cruise leaders: Karl Zinglersen and Aqqaluk Sørensen Survey period: 03/12-2022 to 05/12-2022 Project number: N20001 (N61014) Project manager: Helle Siegstad Contact information: Pinngortitaleriffik, Greenland Institute of Natural Resources Kivioq 2, P.O. 570, GL-3900 Nuuk, Greenland Web: https://natur.gl/ email: [email protected] tel: +299 361200 Document Revision List Rev. Date File Name Description Draft 0 2022-12-19 Tusass Connect Nuuk Skærgård and Ring Survey report - preliminary v0.docx Preliminary report Draft 1 2023-01-09 Tusass Connect Nuuk Skærgård and Ring Survey report - preliminary v1.docx Preliminary report, revised after first commenting Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx Table of contents Summary ........................................................................................................................................................................ 1 Naalisarneqarnera ..................................................................................................................................................... 1 Sammenfatning ......................................................................................................................................................... 1 1. Introduction .......................................................................................................................................................... 2 1.1. Background ................................................................................................................................................. 2 1.2. Objectives ................................................................................................................................................... 2 1.3. Specific objectives ....................................................................................................................................... 2 1.4. Survey route and area summary ................................................................................................................. 3 1.5. Restricted areas .......................................................................................................................................... 5 2. Operational summary ........................................................................................................................................... 6 2.1. Mobilization and testing summary ............................................................................................................. 6 2.2. Survey instruments and software ............................................................................................................... 6 2.3. Survey summary ......................................................................................................................................... 6 2.4. General cruise log ....................................................................................................................................... 8 2.5. Navigation report ........................................................................................................................................ 9 2.6. Fishery activities and other offshore activities observed ............................................................................ 9 2.7. Shipping activities observed ..................................................................................................................... 10 3. Survey technical information .............................................................................................................................. 11 3.1. Calibrations and verifications ................................................................................................................... 11 3.2. Verification at harbor................................................................................................................................ 11 3.3. Calibrations at sea .................................................................................................................................... 12 3.4. Project geodesy and vertical reference .................................................................................................... 14 4. Survey results ...................................................................................................................................................... 16 4.1. General description of segment ............................................................................................................... 16 4.2. Nuuk Ring from Start HDD to End HDD..................................................................................................... 18 4.3. Nuuk Skærgård from Start HDD to KP 06 .................................................................................................. 19 4.4. Nuuk Skærgård KP 06 to KP 16 ................................................................................................................. 21 4.5. Nuuk Skærgård KP 16 to KP 24 ................................................................................................................. 22 4.6. Nuuk Skærgård KP 25 to KP 35 ................................................................................................................. 25 4.7. Nuuk Skærgård KP 35 to 42 ...................................................................................................................... 25 4.8. Nuuk Skærgård KP 42 to 46 ...................................................................................................................... 27 4.9. Nuuk KP 46 to 57 ...................................................................................................................................... 29 4.10. Nuuk Skærgård from KP 57 to 63 ............................................................................................................. 30 4.11. Nuuk Skærgård KP 63 to 74 ...................................................................................................................... 31 4.12. Nuuk Skærgård KP 74 to KP 78 ................................................................................................................. 32 Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx List of tables Table 1: List of acronyms................................................................................................................................................ 7 Table 2: Unit abbreviations ............................................................................................................................................ 7 Table 3: Cruise log .......................................................................................................................................................... 8 List of figures Figure 1: Geological map 1:500.000 from GEUS. Yellow: Orthogneiss, mainly granodioritic to tonalitic; Light brown: Tonalitic to granodioritic gneiss, locally agmatitic; Dark Brown: Mica schist; Pink: Qôrqut granite complex; Green: Amphibolite; Black lines: Faults ................................................................................................................... 3 Figure 2: Planned survey area on navigational chart with marked shipping lanes and territorial borders. Map source: Danish Geodata Agency Chart 1310 ........................................................................................................................ 4 Figure 3: Map of protection zones around bird colonies or areas (red) w. Route lines (red and green lines). .............. 5 Figure 4: Snapshot of backscatter results from the southern part of the survey affected by swells and waves. Black lines perpendicular to the sailed route can be distinguished and will minimize the analytical possibilities ........... 7 Figure 5: Vessel traffic from AIS recordings in November 2022. Green to black cells: Monthly hours pr km2 ship traffic activity, not equally distributed. Source: Global Maritime Traffic Density Service (GMTDS) ...................... 10 Figure 6: Bathymetric overview of the surveyed route. North to the right ................................................................. 16 Figure 7: The Nuuk Ring route from Nuuk harbor to Qinngorput running through the harbor channel, along the deeper bay area around protruding rocks and to the steep slope. ....................................................................... 18 Figure 8: Details of the start of the route. Green line: proposed route, Red dotted line: planned route. ................... 19 Figure 9: Overview of the section from Start HDD to KP 06 over the bay and through the channel ........................... 20 Figure 10: Detailed section of the narrow channel ...................................................................................................... 20 Figure 11: Depressions near KP 13-14 and KP 14 ......................................................................................................... 21 Figure 12: Overview of the section, through the very narrow and changing stretch between KP 20 and KP 24. The alternative route scanned to the south is visible in the bathymetric model. ........................................................ 22 Figure 13: KP 20 of the planned Anchor Point and the c. 85 degree bend, down the slope from NE to SW, and then from NW to SE towards KP 21 through a narrow stretch. ..................................................................................... 23 Figure 14: Area between KP 20 and 21 running between protruding rocks. ............................................................... 23 Figure 15: The corner bend between KP 23 and KP 24 with the north-south-going line in between rocky areas ....... 24 Figure 16: The shallowing of the valley with a more narrow strait and closer proximity to the coast ........................ 25 Figure 17: Cross section near KP 39. The proposed valley of cable installation is the deepest ................................... 25 Figure 18: The narrow channel between KP 38 and 39 with the cross section marked with a full red line ................. 26 Figure 19: The valley between KP 39 and 42 ............................................................................................................... 26 Figure 20: Cross section of ridges in Chart 5 and 6 with distinguishable sand or gravel ridges ................................... 27 Figure 21: Change of geology from bedrock to sediments with wave formations ....................................................... 28 Figure 22: North-South going strait of Narsakkoortariaa with ridge, deeper basin and sediment wave ridges .......... 29 Figure 23: A coherent bassin of c. 255-265 m depth with sediments and fewer bedrock features ............................. 30 Figure 24: Shallow areas and narrow subsea channels W of Meqquitsoq (Skinderhvalen) ......................................... 31 Figure 25: Part of the navigational chart displaying the shallow grounds and difficult navigation possibilities of the water near Saattut off Meqquitsoq. Navigational chart, copyright to Geodatastyrelsen ...................................... 32 Figure 26: The deep basin and corner of the route near the Sankta Maria Skær rock SW of Saattut and Meqquitsoq. Navigational chart, copyright to Geodatastyrelsen ............................................................................................... 32 Figure 27: Continuation of the subsea valley possibly suitable for cable installation, however unmapped during the survey. Navigational chart, copyright to Geodatastyrelsen ................................................................................... 33 Figure 28: Readings from Danish Geodata Agency Hydrographic Office, survey D20261, undated. Copyright Geodatastyrelsen J. nr. KMS-739-00231 ................................................................................................................ 33 Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx List of appendices 1. Vessel specification 2. Survey equipment and general arrangement of sensors 3. List of key personnel 4. Daily reports 5. Summary of equipment breakdown or repairs 6. Bibliography 7. Pipeline Crossing Report Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago - v1.docx Table 1: List of acronyms Term Description DGPS Differential Global Positioning System DGNSS Differential Global Navigation Satellite System GAMS GPS Azimuth Measurement Subsystem GINR Greenland Institute of Natural Resources GNSS Global Navigation Satellite System GPS Global Positioning System IMU Inertial Measurement Unit LAT Lowest Astronomical Tide MBES Multi Beam Echo Sounder MLW Mean Low Water MRS Marine Route Survey NTRIP Network Transport of RTCM via Internet Protocol R/V Research Vessel PDS2000 Teledyne RESON Navigation Software RPL Route Position List RTCM Radio Technical Commission for Maritime Services RTX Real Time Kinematic global modelling technology (Trimble) RTK Real Time Kinematic SVS Sound Velocity Sensor SVP Sound Velocity Profile UTM Universal Transverse Mercator WGS84 World Geodetic System 1984 Table 2: Unit abbreviations Term Description d Degree(s) cm Centimeter(s) Nm Nautical mile(s) hr Hour(s) kHz Kilohertz km Kilometer(s) km2 Square Kilometer(s) kts Knots m Meter(s) m/pixel Meter(s) per pixel m/s Meter(s) per second mL Milliliter(s) mm Millimeter(s) Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 1 of 40 Summary This report covers a survey of the seabed to find a suitable route for installing submarine cables from the Atlantic to Nuuk. The survey on board R/V Tarajoq was conducted over 48 hours starting and ending in Nuuk. Due to bad weather along the west coast of Greenland, it was not possible to cover the remaining areas. During the study, the coverage and data quality obtained were verified as suitable for the purpose. Naalisarneqarnera Immap naqqanik misissuisoqarsimanera uani nalunaarusiarineqarsimavoq, Atlantikup imartaaniit Nuummut kabelilersuisoqassappat aqqutigisinnaasaanik piukkunnartorsiornissaq angalanerup siunertarisimavaa. R/V Tarajoq-mik angalaneq akunnerit 48it sipporlugit sivisussuseqarsimavoq, Nuuk avalaffigeriarlugu utimut tulaffigeqqinneqarsimavoq. Kalaallit Nunaata kitaani silarlunnera pissutaalluni sumiiffiit sinnerisa misissuiffigineqarnissaat pisinnaasimanngilaq. Angalanermi misissukkat nalunaarsuutillu pitsaassusaat aallaavigalugit umiarsuaq suliassamut piukkunnaateqarluartoq uppernarsarneqarpoq. Sammenfatning Denne rapport dækker en undersøgelse af havbunden for at finde en egnet rute til installation af undersøiske kabler fra Atlanterhavet til Nuuk. Undersøgelsen ombord på R/V Tarajoq blev gennemført over 48 timer med start og slut i Nuuk. På grund af dårligt vejr langs Grønlands vestkyst var det ikke muligt at dække de resterende områder. Under undersøgelsen blev den opnåede dækning og datakvalitet verificeret som egnet til formålet. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 2 of 40 1. Introduction 1.1. Background The national Greenland telecommunication company Tusass A/S is planning on expanding their network of subsea telecommunication cables. Greenland Institute of Natural Resources (GINR) has been requested to assist with a marine survey of for the passage between the capital Nuuk and existing stations in the Atlantic Ocean (Skærgårdsruten) as well as a short section between Nuuk Harbor to the town’s suburb Qinngorput. 1.2. Objectives The main objective of the survey is to establish a bathymetric data set and relevant sea bottom coverage for the future installation of the planned telecommunication cable route from the Qinngorput headland at Start HDD to the point AC 61. To support the main objective, several subsidiary objectives are needed including calibration, correctional data, processing, interpretation, map production, and reporting. The results of the process, data retrieved and processed, analysis and reporting are also to be evaluated. 1.3. Specific objectives 1. Mobilization of R/V TARAJOQ and calibration at sea of instruments. 2. Survey with multi beam instrument from Nuuk landing near Qinngorput (Start HDD) to point AC 61 off Kangerluarsoruseq and return to a coverage fit for purpose within limits of planned survey time. 3. Sound velocity profiling at sea for corrections during processing 4. Recording of POSPac DGNSS measurements at sea for corrections during processing 5. Interim survey report 6. Processing of data to a relevant degree 7. Interpretation of survey results and preparation of report fit for cable installation. 8. Evaluation of project process. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 9 of 40 2.5. Navigation report According to the ship’s logbook R/V Tarajoq was berthed at Feeder Quay and sailed from Nuuk on the 3rd of December 2022 at 10:30 (UTC +3) on a voyage for multi beam survey. Every hour a GPS position was recorded in the logbook. At 10:00 AM every day the captain reported the current position and plans to the Aasiaat Radio authorities. A snow shower was recorded Saturday 3rd of December 2022 at 21:00 (UTC +3). Sunday early morning, the logbook notices wind 6-7 m/s from SE, cloudy, +1˚ C and 1026 hPA. Position and plans communicated to Aasiaat Radio at 10:00. Monday of similar properties, however 4˚ C and wind from SSE, at 13:00 local time finished survey awaiting moorage. At 16:30 there was a Man Over Board boat exercise. At 17:00 waiting at Nuuk Roadsted unloading 6 PAX, 17:10 return to Nuuk Roadsted, at 17:30 anchoring N of Rypeø, still awaiting moorage. 2.6. Fishery activities and other offshore activities observed During operation, a small orange buoy, possibly with a subsea net attached, was observed, and avoided. Smaller fishing vessels were observed at different times, however not in operation, probably due to weather circumstances. It is recommended to perform an analysis of recorded fishery activities from sources of AIS and the Greenland Fisheries License Control. GINR can be of assistance in such analysis. No offshore activities, e.g., dredging, dumping, drilling, construction, or charting, were observed during navigation. It is recommended to consult the Danish Maritime Authority, the local harbor and eventually the Ministry of Minerals before cable installation activities to establish an overview of possible activities during operation. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 10 of 40 2.7. Shipping activities observed The Nuuk Ring and northern part of Nuuk Skærgård is situated in and in proximity to the busiest harbor of Greenland with intense traffic of dinghies, trawlers, smaller fishing vessels and large container ships. Their operations were monitored visually and on AIS screen during navigation, however not recorded. A large part of the route is in a narrow strait with only a little traffic from dinghies and smaller fishing vessels. The northern and southern parts of the route are in the shipping lane towards Nuuk and consequently with normally more vessel traffic, however only little during survey due to the severity of weather. Offshore a large container vessel was observed having difficulties in heading further south due to severe headwind. It is recommended to perform an analysis of the general traffic pattern by using satellite AIS data. GINR can assist in such analysis, however not within the scope of the current report. An interim overview from November 2022 can be seen below. It reveals that the shipping lanes in general are used and correspond with the southern route of the cable. The map also reveals a more direct southern going route between the islands West of the outlaid lane, likely used for smaller vessels. The planned and proposed survey route is used for maritime traffic. Figure 5: Vessel traffic from AIS recordings in November 2022. Green to black cells: Monthly hours pr km2 ship traffic activity, not equally distributed. Source: Global Maritime Traffic Density Service (GMTDS) Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 11 of 40 3. Survey technical information 3.1. Calibrations and verifications In Spring 2022, when the new vessel was received from production shipyard in Spain and before commencing fishery surveys in West and East Greenland, a new dimensional control survey was conducted at Søviksnes Yard in Norway and a patch test and GAMS maneuver near Nuuk upon arrival. The instrument provider of GINR, Teledyne Marine RESON, established the coordinate reference system of the vessel and instruments from information in the dimensional control survey report, and calculated the offset values from the patch test and GAMS maneuvers to their satisfaction. After end of fishery cruise season, the vessel arrived at Nuuk few days before the cable survey for Tusass. The survey team of GINR conducted a patch test on the 30th of November but identified a horizontal offset of c. 80 meters in the sailing direction over a steep slope, which was assessed as a severe issue before commencing further survey. In the office, the instrument provider was contacted for identification of the source of the issue, and the GINR survey team independently sought and tested different possible sources of failures. A lack of clock synchronization between instruments was suggested, and a new test over the same steep slope was conducted with slightly better but not exact results. Consequently, further testing scenarios and calculations were done in the office. The instrument provider did not provide other relevant options for finding the source of the offset, so the GINR survey team contacted the US partners of CCOM, University of New Hampshire. Together, they recalculated and moved the reference coordinate system of vessel and instruments, and inserted the new values in the instrument software, Applanix PosView positioning software and Teledyne PDS acquisition software. The new reference point (0,0,0) for the coordinate system is the top mark of the Applanix OceanMaster IMU. Because of the changes the previously acquired data fell into place with only limited offsets to be calibrated in a new patch test and GAMS calibration. 3.2. Verification at harbor The vessel is newly built, so full mobilization had not been completed well before the vessel’s arrival to Nuuk. The screen system on bridge was re-configured to display content from multi beam computer, computers were moved to server room and network reconfigured, backup procedures established, updates of software and operating system conducted, and connection to SVP probe altered. Before calibration at sea, it was verified that the acquisition computer and PDS software could receive GNSS positioning and inertial motion sensing data via Applanix POSMV and Seabat 7160 sonar, and Applanix PosView could receive online GNSS network RTK positioning from Trimble CenterPoint™ RTX real time kinematic satellite service (RTX) over the NTRIP protocol. Innomar Sub-Bottom Profiler was configured to the project and working. Valeport Datalog X2 for sound velocity probing was working and could connect to probe. Online sensing of sound velocity for hull-mounted probe RESON SVP70 AML was working. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 12 of 40 The license for conducting hydrographic survey received from the Danish authority, Danish Geodata Agency, was provided to the captain in case of being required from the Arctic Command coast guard authority when at sea. 3.3. Calibrations at sea The calibration of instruments was completed at sea: • Check of systems at sea. • Patch test to resolve static biases of roll, heading, time delay, pitch and sound velocity. • GAMS calibration of GNSS positioning • Final patch test at end of cruise Checklist: Item Description Multibeam software and instruments In Sonar computer Check of Seabat 7160 MBES in SonarUI of system health and general measurements. Startup of Seabat 7160 CW pulse mode, 44 kHz, full power, 200 µs pulse length, 0 gain, 20 dB spreading, 20 dB absorption, 1.5˚ beam width. Clock synchronization in 7K IO Module, normalization check, Check of sonar image wedge display, Trigger output activation between Seabat sonar and Innomar SBP PosView software and instruments In Multibeam acquisition PC. Check of Lever Arms & Mounting Angles configuration. Check in POSView of POSMV online data receiving: POS Mode = Nav Full, IMU Status = OK, Nav Status = Pri. Trimble RTX, GAMS = Online, Ethernet log = Logging, Attitude = green, Heading = green, Position = green, Velocity = green, Heave = green, Position Accuracy (m) = c. 0.04. Check of POSPac ethernet log running. Check of GAMS calibration running. Other sonars In K-Sync administration computer Disabling of disturbing echo sounder signals from other instruments Acquisition software On multibeam acquisition PC. Check of PDS2000 software startup Project setup: UTM Zone 22 WGS 84 map projection, active grid 5 m resolution, coastline G100V DXF. Check of vessel configuration and offsets. Offsets only on MBES sonar required. Check of settings for logging and backup (PDS, Snippets, active grid, s7k) Check of Acquisition program in PDS2000. Start up, running line, check of Messages. Check of resulting files in folders on computer and NAS backup server Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 13 of 40 Patch test Patch test at sea solving: A) Time delay and pitch bias combined a. Repeated line x4, same direction and inverse direction, 6 knots and 12 knots b. Perpendicular to a slope and a seabed feature B) Roll bias a. Repeated line x2, inverse direction, any speed b. Optionally across-track profile c. Flat, smooth seafloor C) Heading bias a. Offset lines, same direction, same speed, 6 knots b. Crossing the same seabed feature in both swaths GAMS calibration Calibration at sea of GNSS antenna positioning, and consequently online during cruise. Check GAMS Solution in software. Number of satellites in view >5. Maneuvering of vessel through moderately aggressive turns: figures of 8 and changes of speed. Check GAMS status to be Online. Save configuration All checks and calibrations were fulfilled before the start of cruise. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 14 of 40 3.4. Project geodesy and vertical reference Data were recorded and processed in WGS84 UTM Zone 22 N (EPSG:32622). Definition of WGS84 UTM Zone 22 N in OGC WKT: Spheroid WGS84 Datum WGS84 Semi major axis (a) 6,378,137.000 m Semi minor axis (b) 6,356,752.314 m Inverse flattening (1/f) 298.257223563 Projection UTM Zone(s) 22 N Longitude of origin 129 W Latitude of origin 0 N False Northing 0 False Easting 500,000 m Scale factor on CM 0.9996 Unit of measurement Meters In Tusass Survey Requirements it is required that Swath bathymetry with all soundings and subsequent contours reduced to lowest astronomical tide (LAT) by prediction. For the current survey, measurements in three dimensions were received from the GNSS antennas, the multi beam sonar, and the inertial motion unit with GNSS positional corrections XYZ from the Trimble CenterPoint RTX online survey with a positional quality below 0.05 m. The height information recorded through the current survey is relative to the Ellipsoid Heights, and depths have been reduced to Ellipsoid Elevations utilizing automatic recordings of local tidal changes in the Z direction from the GNSS instrument onboard. Elevations have been further converted to Mean Sea Level Orthometric Heights for Greenland regionally, using calculations to the Greenland geoid GGEOID2016 produced by the Agency for PROJCS["WGS 84 / UTM zone 22N", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4326"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",-51], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",500000], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AXIS["Easting",EAST], AXIS["Northing",NORTH], AUTHORITY["EPSG","32622"]] Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 15 of 40 Data Supply and Infrastructure. By doing so the depths are referenced to Greenland Vertical Reference 2016, GVR2016. The geoid grid implements the transformation between GRS80 ellipsoid heights and heights in the GVR2016 system with coordinates referenced to GR96. The horizontal grid is referenced to GR96 defined by the Agency for Data Supply (SDFI) and Infrastructure and the Nordic Geodetic Commission (NKG). Download and more information on the GGEOID2016 geoid for Greenland can be found at the website of SDFI and NKG, and the GitHub page of NKG. (https://github.com/NordicGeodesy/NordicTransformations). The measured swath bathymetry soundings and derived contours are not reduced further from the Greenland geoid to Lowest Astronomical Tide, LAT, or Chart Datum, during survey or in the subsequent processes. Real-time water level data for the tide station of Nuuk (station 820) is not available from Danish Meteorological Institute, DTU Space, or the University of Hawaii Sea Level Center website with the station published by DTU Space (https://uhslc.soest.hawaii.edu/stations/?stn=820). A national LAT model is under development by DTU Space for the SDFI, however not finalized yet by end of 2022 (pers. comm., SDFI employee). For future expansion of bathymetric measurements to other regions and towns, and the subsequent cable installations and directional drillings from land to seabed, it is advised to consider local variances in the datums for Greenland, particularly between the Technical Base Maps of towns and villages and the used MSL, the current national geoid GGEOID2016, and the local LATs, as well as the documentation and data behind these datums. It is advised to consult the national authorities and their scientific advisors on this subject: The Danish Agency for Data Supply (SDFI) and Infrastructure and the Danish Geodata Agency (GST), and their scientific advisors at Danish Meteorological Institute (DMI) and Denmarks Technical University, Department of Space Research and Technology (DTU Space). Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 16 of 40 4. Survey results The survey involved remote sensing measurements with 44 kHz multi beam sonar and c. 100 kHz sub-bottom profiler, with no additional ground truthing observations such as grab, coring or imagery. Geological and morphological analyses are thus based on results from these acoustical methods. General depths quickly find depths of 100 m or deeper and consequently smaller details such as boulders are difficult to distinguish from the frequencies and beam properties utilized. Recordings from sub-bottom profiler have not been processed, because no burial of cable is planned. The data can be processed and interpreted upon request. 4.1. General description of segment The surveyed segment is situated in the archipelago West Greenland, W of Nuuk. The sea bottom can be divided into coherent regions based on bathymetry, morphology, and geology. The northernmost part near Nuuk is in a bay area with a homogenous subsea plain of possibly sediments (Chart 001, Nuuk Ring KP0-2, Nuuk Skærgård KP 0-4), then the route travers a narrow and shallow strait between the islands of Taartunnguaq and Ikaarissat made of Archaic bedrock (gneiss) before it runs through a subsea valley in the Ivinnguit fault, again with a relatively plain surface besides a depression (Chart 002-003). Later the route enters an area of undulating Archaic, which provides a challenging environment for navigation and cable installation to avoid numerous rocks, an open part of the route and finding the best route for installation (Chart 003). Going SE, the route follows a deep valley, at deepest c. 280m, with good possibilities for cable installation – although a bend is needed at KP28 (Chart 003-004). The bottom seems soft with sediments, while the sides are of hard bedrock. The deeper valley ends at KP 30, and it is again a challenging narrow subsea channel between the subsea bedrocks supporting the islands Qernertulissuaq, Angisorsuaq, and Qassisallit, and the smaller Figure 6: Bathymetric overview of the surveyed route. North to the right Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 17 of 40 island SE hereof. Near KP 35 the route is entering the navigational route to Nuuk (Chart 005). The subsea channel between bedrock outcrops continues until KP 43. After a c. 90-degree bend to the S, the survey corridor broadens to cover the deep strait of Narsakkoortariaa (Narsaq Løb), which seabed include deep sediment basins and ripples of gravel waveform sediment deposits possibly produced by currents on the seafloor. The deep basin is 4 km x 1.5 km and ends at a subsea ridge with the similar ripples of 2-10 m height (Chart 006), and S hereof another basin of c. 7 km length, and then a bedrock ridge with a steep slope at KP 56-57 to the deepest basin of the survey (5 km length, c. 270 m depth, Chart 007-008). Subsequently, the route enters the narrow and more shallow passage near Meqquitsoq (Skinderhvalen) and Saattut surrounded by small islands and numerous rocks that dries up during low tide. The route is difficult to navigate and with only a little space for cable installation. The survey ended near the territorial base line at KP 78. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 18 of 40 4.2. Nuuk Ring from Start HDD to End HDD Chart: Nuuk Bathy Segment 1 Chart 1 The near-coast waters shallower than c. 0-30 m meters have not been measured but require an inshore survey with a different logistical and sonar setup. Nuuk Ring is a short segment running from a peninsula down a gradient slope at the mouth of the industrial harbor into the bay in front of Nuuk harbor around protruding rock outcrops to the north near the islands to the southernmost tip of the Qinngorput area up a steep slope. Morphologically, the geology along the coast is of undulant bedrock (gneiss or similar) and the relatively flat sea floor near KP 01 and KP 02 seems to be of sediment, probably gravel with depths of c. 110-130 m. Figure 7: The Nuuk Ring route from Nuuk harbor to Qinngorput running through the harbor channel, along the deeper bay area around protruding rocks and to the steep slope. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 25 of 40 4.6. Nuuk Skærgård KP 25 to KP 35 Chart: Nuuk Bathy Segment 1 Chart 03 and 04 From KP 24 to KP30, the route follows a deep valley with sediments and a more space between protruding rock outcrops, one of the larger is just north of KP 28, where the route bends to avoid this. From KP 30 the valley gets shallower and more rock outcrops protrude, which requires navigation of the route between these. Figure 16: The shallowing of the valley with a more narrow strait and closer proximity to the coast The route is only bending a little to avoid rocks, but after KP 34 a larger degree bend is necessary to find a passage. 4.7. Nuuk Skærgård KP 35 to 42 Chart: Nuuk Bathy Segment 1 Chart 04 and 05 The undulating terrain below sea surface continues from KP 34 to KP42. Between KP 36 and KP 38 it is wider but still with protruding rocks and not a smooth surface. Near KP38 and to KP 39 the submerged valley is very narrow (c. 100m) and surrounded by steep, shallow rock areas, changing c. 80 m vertically within 130 m. Figure 17: Cross section near KP 39. The proposed valley of cable installation is the deepest Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 26 of 40 Figure 18: The narrow channel between KP 38 and 39 with the cross section marked with a full red line From KP 39 the valley widens and deepens, and two options open for routing. However, as there is a wish for as few bends as possible, the deep valley is not followed entirely but a route least changes in depth are found passing KP 40 and north of a rocky outcrop. Figure 19: The valley between KP 39 and 42 Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 27 of 40 4.8. Nuuk Skærgård KP 42 to 46 Chart: Nuuk Bathy Segment 1 Chart 05 and 06 From KP 42 the route is downhill towards a broad deep area. The geology changes immensely with the bedrock archipelago to the W and softer sediments to the E and S. The part covers a large basin with sediments, surrounded by the archipelago and bedrock slopes. Many gravel or sand ridges are located on the bedrock slopes or outcrops. The ridges are aligned in an E-W direction perpendicular to the proposed cable route. The amplitude of the ridges are c. 2-5 meters, Figure 20, and located at 100-200 m depths. Figure 20: Cross section of ridges in Chart 5 and 6 with distinguishable sand or gravel ridges These features suggest massive transport of sediments probably by tidal waves or currents between the fjords and the ocean. The nearby Ameralik Fjord is connected to the Greenland Icesheet via a large sedimentary delta and rivers, transporting large volumes of sediments. The suggested route tries to find the route least affected by the gravel or sand ridges. However, it is not possible to entirely avoid this at KP 43 if no further bends must be introduced. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 28 of 40 Figure 21: Change of geology from bedrock to sediments with wave formations Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 29 of 40 4.9. Nuuk KP 46 to 57 Chart: Nuuk Bathy Segment 1 Chart 06 and 07 In direction S from KP 46 there is a ridge over c. 1,5 km width from the island Qeqertarsuaq to the islands Qilaangaarsuit and Kittoqqat over the strait Narsakkoortariaa (Narssaq Løb). The ridge has similar waveform sedimentary ridges perpendicular to the strait but with longitudinal streams of sediments to the previous section. Reading the morphology, they sit on top of bedrock with a sediment cover softening the bedrock shapes. From KP 48 to KP 51 there is a deep basin with a smooth surface indicating sediments. Further longitudinal sediment formations and a deepening near a bedrock formation to the S around the edge of the basin also indicate strong sedimentary transport processes in the N-S direction. From KP 51 to KP 53 bedrock with the wavy sediment forms are met again, followed by a part until KP 56 with a smooth and little deeper surface. At KP 55 the route bends to avoid a rocky outcrop. Between KP 56 and KP57, there is a sharp descent of c. 100 m vertically within c. 450 m horizontally into the deepest basin of the survey area. The optimal route down the slope is identified, and it is recommended to cover an additional area E of KP54 to KP58 to search for a smoother route avoiding a rocky area W of the mentioned KP’s. An extension of the survey to the W of the planned route did reveal a relevant alternative crossing the shallower rocky area but met other obstacles further to the south. The survey coverage width was extended to 2400 m, almost 2.5 times the requirements. Due to severe weather in the near-offshore region, it was not possible within the time frame to cover further areas to the E. For now, the proposed route follows a slope of less ruggedness as the planned route. Figure 22: North-South going strait of Narsakkoortariaa with ridge, deeper basin and sediment wave ridges Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 30 of 40 4.10. Nuuk Skærgård from KP 57 to 63 Chart: Nuuk Bathy Segment 1 Chart 08 After the steep descent between KP 56 and KP 57, there is a long stretch of smooth surface, probably of sediments in a deep basin of 255-265 m depth. At KP 60 and 61 there are some rocky outcrops, which can however be avoided easily. From KP 62 and onwards, the space between the rocky outcrops narrows significantly as a shallower (still c. 65 m depth) party of bedrock is passed, and the subsea landscape is becoming again more undulated. Figure 23: A coherent bassin of c. 255-265 m depth with sediments and fewer bedrock features Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 31 of 40 4.11. Nuuk Skærgård KP 63 to 74 Chart: Nuuk Bathy Segment 1 Chart 09 and 10 This section is close to the prominent land feature Meqquitsoq (Skinderhvalen) marking a geological outpost between the protected coastal waters, a complicated and undulated seabed morphology, and the open Atlantic Ocean. To local mariners, the area is known for strong winds and waves and swells from the ocean, and mixed wave behavior due to the change from ocean bathymetry to shallow, undulant waters. Nearby an oscillation of 40˚ on magnetic compasses is recorded (Anon., 2021). Figure 24: Shallow areas and narrow subsea channels W of Meqquitsoq (Skinderhvalen) The stretch is characterized by rocky outcrops and narrow channels in between. The area is difficult to navigate due to harsh weather and shallow grounds. Near KP 68 and KP 73 there are rocks of only 6 m depth LAT or less, so the possibilities of finding alternative routes are very limited. Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 32 of 40 The full 1000 m coverage asked for has not been possible to meet with the current configuration and platform used for the survey. It would be difficult to expand the survey coverage much. If needed, then it is suggested to investigate part W of KP 69-70 (at 147 and 57 m depth on the navigational chart) for an alternative to the route between the to KP’s. Figure 25: Part of the navigational chart displaying the shallow grounds and difficult navigation possibilities of the water near Saattut off Meqquitsoq. Navigational chart, copyright to Geodatastyrelsen 4.12. Nuuk Skærgård KP 74 to KP 78 Chart: Nuuk Bathy Segment 1 Chart 10 It was not possible to fulfill the entire survey to the W in the Atlantic Ocean due to severe weather, and the stretch is only covered by two lines stopping shortly after KP 78. However, they reveal a very deep basin of c. 280m depth W of Sankta Maria Skær (a named rock). The route bends in the center of the basin midway between KP 75 and 76 and runs further along the basin moving into a valley depressing passing KP 77-78. The bassin is expected to have softer sediments in the bottom and is 500-1000 m wide. Figure 26: The deep basin and corner of the route near the Sankta Maria Skær rock SW of Saattut and Meqquitsoq. Navigational chart, copyright to Geodatastyrelsen Tusass Connect Marine Route Survey report. Seabed survey feasibility study in Nuuk archipelago 33 of 40 Although the planned route was not covered further than KP 78 with c. 22 km missing to the planned endpoint, the navigational chart Chart 1310 reveals that the valley is continuing to the WSW between shallower areas. A particular point of interest would be the narrow saddle or pass of 71 m depth. Figure 27: Continuation of the subsea valley possibly suitable for cable installation, however unmapped during the survey. Navigational chart, copyright to Geodatastyrelsen The sources to the navigational chart is for the area scarce and of early origin, before multi beam systems were used and possibly also before the use of electronic survey systems, so positions and recordings are not of recent standards. However, the recordings provide an impression of the seabed morphology, and show that the planned route is possible throug the narrow valley and over the 71m pass. After the 71m pass the route should have a stronger bend to avoid side features of the shallower ground left of 71m. Figure 28: Readings from Danish Geodata Agency Hydrographic Office, survey D20261, undated. Copyright Geodatastyrelsen J. nr. KMS-739-00231 1. Vessel specification 3 2. Survey equipment 7 3. List of key personnel 19 4. Daily Project Reports 21 5. Summary of equipment breakdown or repairs 47 6. Bibliography 49 7. Pipeline Crossing Report 51 Appendix 2 2 Vessel coordinate reference system (during dimensional control survey, report can be received upon request) 2. Survey equipment 8 Appendix 2 3 Applanix POS MV OceanMaster Positioning system Rack mounted computing system. Stationary mounted IMU and GNSS antennas. Manages GNSS position data, correction from base station data providers, IMU motion data, GNSS Azimuth Measurement System (GAMS) heading. Logging to files, and distribution via ethernet of data to SeabatUI, PDS2000 and Innomar SES-2000 (time tag, status, position, attitude, velocity, track, speed, dynamics, performance metrics, raw IMU, and raw GNSS data). Post-processing of data in POSPac MMS8 as backup to Trimble CenterPoint RTX online corrections. MV-POSView software, with corrections from Trimble CenterPoint RTX 2. Survey equipment 9 Appendix 2 4 Applanix OceanMaster Internal Motion Unit (SN 11262, top hat SN 5520) 2. Survey equipment 10 Appendix 2 5 Trimble 540AP GNSS antenna, ANT1 40 starboard side, ANT1 41 port side 2. Survey equipment 11 Appendix 2 6 Sonar systems Teledyne RESON Seabat 7160 multi beam sonar Tx, Rx 2. Survey equipment 12 Appendix 2 7 Teledyne RESON Seabat Transceiver and Processing units 2. Survey equipment 13 Appendix 2 8 Innomar SES-2000 Medium-100 Sub bottom Profiler 2. Survey equipment 14 Appendix 2 9 Sound Velocity Profiling Teledyne SVP-70 online Sound Velocity Probe, hull mounted Valeport miniSVP Sound Velocity Probe, for over the side profiling of water column, DataLog X2 software 2. Survey equipment 15 Appendix 2 10 2. Survey equipment 16 Appendix 2 11 The configuration settings Table 1 Offsets with IMU as reference origin and Applanix sign convention. REFERENCE FRAME: APPL. +X FWD, +Y STBD, +Z DOWN LINEAR OFFSETS ANGULAR OFFSETS REFERENCE ORIGIN: IMU REF POINT Alongship Athwartship Vertical Roll Pitch Yaw TARGET SOURCE + FWD (X) + STBD (Y) + DOWN (Z) + PORT UP + BOW UP + COMPASS Vessel Reference Point Baseline at Rudderstock Calculated -41.803 -0.504 16.81 Center of Gravity Calculated -16.468 -0.504 9.331 POS MV IMU Ref. Point By definition 0 0 0 -0.39 -0.13 0.04 RESON 7160 TX Array Calculated 6.747 -0.463 16.877 -0.23 2.09 0.26 RESON 7160 RX Array Calculated 7.73 -0.461 16.806 -0.15 2.5 -0.15 GNSS Antenna PORT (ID 41) Calculated -10.252 -2.234 -12.628 GNSS Antenna STBD (ID 40) Calculated -10.143 1.226 -12.65 Table 2 Offsets with IMU as reference origin and Reson sign convention. REFERENCE FRAME: RESON+X STBD, +Y BOW, +Z UP LINEAR OFFSETS ANGULAR OFFSETS REFERENCE ORIGIN: IMU REF POINT Alongship Athwartship Vertical Roll Pitch Yaw TARGET SOURCE + FWD (Y) + STBD (X) + UP (Z) + PORT UP + BOW UP + COMPASS Vessel Reference Point Baseline at Rudderstock Calculated -41.803 -0.504 -16.81 Center of Gravity Calculated -16.468 -0.504 -9.331 POS MV IMU Ref. Point By definition 0 0 0 -0.39 -0.13 0.04 RESON 7160 TX Array Calculated 6.747 -0.463 -16.877 -0.23 2.09 0.26 RESON 7160 RX Array Calculated 7.73 -0.461 -16.806 -0.15 2.5 -0.15 RESON 7160 TX Array relative to RX Calculated -0.983 -0.002 -0.071 GNSS Antenna PORT (ID 41) Calculated -10.252 -2.234 12.628 GNSS Antenna STBD (ID 40) Calculated -10.143 1.226 12.65 2. Survey equipment 17 Page 2 of 4 LAST SAVED: 02-01-2023 15:21:00 (local time) PROGRESS AND EVENTS SUMMARY OF WORK: Summary of the work performed during the preceding 24 hours Vessel in Nuuk harbor in morning. Setting up of: MBES operator computer to sonar room rack, network connectivity to sonar LAN network with assistance from Vodanet, Adder screens to operator computer w DVI to mini-display port, POSView network setup, POS Trimble RTX configuration with assistance from Applanix, Valeport SVP Datalog software configuration. Afternoon: departure from Nuuk 15:10 local time. Patch test survey on slope and flat seabed close to Nuuk. Three times up and down slope, two times each way on flat area, two times across a distinctive feature. Run of SVP. At harbor 18:45 Backup and finishing until 20:00 SUMMARY OF PLANNED WORK: Summary of planned work for the next 24 hours Wednesday will include processing of patch test data, setup of survey plan, setup K-Sync, Innomar SBP, extension of screens on Adder system. Plan for the next day’s start of survey. WEATHER AND SEA STATE: LAST 24 HRS: Not recorded FORECAST 24 HRS: Not recorded SIGNIFICANT EVENTS THE LAST 24 HOURS: Notes on: samplings, start and finish of sections, technical breakdowns or other issues, safety issues, navigation events, activities from fishery, shipping or other offshore activities. 15:00 Departure from Nuuk for patch test and sea trials 19:00 Arrival to harbor 20:00 End of day’s work 4. Daily Project Reports 24 Page 3 of 4 LAST SAVED: 02-01-2023 15:21:00 (local time) TIME STATISTICS Time spent on effective work during each 24 hour period and cumulative total.(ship time, not man hours) Activity Last 24 hours Cummulative Comments/notes Mobilization/demob. 7 7 Configurations In transit WDT standby Ship downtime 1 1 Opening of HY hangar door Other (comments) Sampling work Surveying work 4 4 Patch test Total time (24h) 12 12 Not full 24h TIME ON DAY RATE Mobilization/demob. 0 0 In transit / survey 0 0 Weather Down Time 0 0 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 0 0 TOTAL SURVEY TIME 12 12 LENGTH STATISTICS (km) Survey track 0 0 Proposed cable route 0 0 SUMMARY OF SECTION SEABED MORPHOLOGY AND SURFACE GEOLOGY Steep slope with outcrop at c. 50 m, flat seabed at c. 300 m SEABED SUBSURFACE GEOLOGY Not applicable OTHER OBSERVATIONS Not applicable 4. Daily Project Reports 25 Page 4 of 4 LAST SAVED: 02-01-2023 15:21:00 (local time) COMMENTS & ENDORSEMENT COMMENTS Deviations, additions, alterations from survey party chief REPRESENTATIVES’ COMMENTS Comments from the clients representative SIGNATURES Karl Zinglersen Niklas Carlsson Party chief Client representative Date: Date: 4. Daily Project Reports 26 Page 1 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) DAILY PROJECT REPORT REPORT NO.: 002 DATE: 2022-12-01 VESSEL: R/V Tarajoq VHF CALL SIGNAL: OYLD VESSEL TELEPHONE: +45 32421294 VESSEL E-MAIL: [email protected] PROJECT NAME: Tusass Connect Nuuk PROJECT NO.: 61014 / PARTY CHIEF: Karl Zinglersen PROJECT MANAGER: Helle Siegstad PARTY CHIEF email.: [email protected] RECEIVERS OF DAILY REPORTS: Name: Company: Email: Note: Mads H. Petersen Tusass [email protected] Project manager, Tusass Ture Jönsson (Tusass) [email protected] Advisor to project Steen Hansen Tusass [email protected] Head of Department Niklas Carlsson Baltic Offshore [email protected] Advisor to project Helle Siegstad GINR [email protected]l Head of Department POSITION AND OVERVIEW: Geographical position of the survey vessel at the time of the report and include an overview chart showing completed and non-completed sections. Position (Lat./Lon): NA NA Section: NA Area name: Nuuk harbor, off Nuuk Overview chart insert: Patch test area off Nuuk and work in Nuuk office of recorded data 4. Daily Project Reports 27 Page 2 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) PROGRESS AND EVENTS SUMMARY OF WORK: Summary of the work performed during the preceding 24 hours Summary of the work performed during the preceding 24 hours, Data processing of patch test data from the day before. Experienced a gross error on upslope/downslope measurements. Approximately 13 seconds delay resulting in several meters offset. The error was identified as a time delay between instruments, and Teledyne Marine was consulted. Check of configuration in PDS and changing Clock synchronization from POSMV to Seabat. Conducted new patch test survey on the slope off Nuuk, starting at 15:00 local time. SUMMARY OF PLANNED WORK: Summary of planned work for the next 24 hours Summary of planned work for the next 24 hours. Processing and reporting of new patch test. Planning of new ETD considering last mobilization efforts needed, and reporting to client and vessel crew of new ETD. WEATHER AND SEA STATE: LAST 24 HRS: Not recorded FORECAST 24 HRS: Not recorded SIGNIFICANT EVENTS THE LAST 24 HOURS: Notes on: samplings, start and finish of sections, technical breakdowns or other issues, safety issues, navigation events, activities from fishery, shipping or other offshore activities. 8:00 Start of data processing and analysis of patch test 15:00 Start of new patch test survey off Nuuk 20:00 Leaving vessel after return to Nuuk harbor, backup procedures etc. 4. Daily Project Reports 28 Page 3 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) TIME STATISTICS Time spent on effective work during each 24 hour period and cumulative total.(ship time, not man hours) Activity Last 24 hours Cummulative Comments/notes Mobilization/demob. 12 24 In transit 0 0 WDT standby 0 0 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 12 24 Not full 24h TIME ON DAY RATE Mobilization/demob. 0 0 In transit / survey 0 0 Weather Down Time 0 0 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 0 0 TOTAL SURVEY TIME 12 24 LENGTH STATISTICS (km) Survey track 0 0 Proposed cable route 0 0 SUMMARY OF SECTION SEABED MORPHOLOGY AND SURFACE GEOLOGY SEABED SUBSURFACE GEOLOGY OTHER OBSERVATIONS 4. Daily Project Reports 29 Page 4 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) COMMENTS & ENDORSEMENT COMMENTS Deviations, additions, alterations from survey party chief REPRESENTATIVES’ COMMENTS Comments from the clients representative SIGNATURES Karl Zinglersen Niklas Carlsson Party chief Client representative Date: Date: 4. Daily Project Reports 30 Page 1 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) DAILY PROJECT REPORT REPORT NO.: 03 DATE: 2022-12-02 VESSEL: R/V Tarajoq VHF CALL SIGNAL: OYLD VESSEL TELEPHONE: +45 32421294 VESSEL E-MAIL: [email protected] PROJECT NAME: Tusass Connect Nuuk PROJECT NO.: 61014 / PARTY CHIEF: Karl Zinglersen PROJECT MANAGER: Helle Siegstad PARTY CHIEF email.: [email protected] RECEIVERS OF DAILY REPORTS: Name: Company: Email: Note: Mads H. Petersen Tusass [email protected] Project manager, Tusass Ture Jönsson (Tusass) [email protected] Advisor to project Steen Hansen Tusass [email protected] Head of Department Niklas Carlsson Baltic Offshore [email protected] Advisor to project Helle Siegstad GINR [email protected]l Head of Department POSITION AND OVERVIEW: Geographical position of the survey vessel at the time of the report and include an overview chart showing completed and non-completed sections. Position (Lat./Lon): Section: Area name: Nuuk harbor Overview chart insert: Work in office at Greenland Institute of Natural Resources 4. Daily Project Reports 31 Page 2 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) PROGRESS AND EVENTS SUMMARY OF WORK: Summary of the work performed during the preceding 24 hours Analysing data from patch tests at 30th november and 1st December. Contact with multi beam system provider Teledyne Marine RESON in Denmark. The two patch tests revealed an offset of c. 89 m along track when covering a steep slope from Malenebugt to Godthåbsfjord basin. The matters was discussed with the provider and analysed separately. AQQS discovered that there must be mistakes in the coordinate system configuration of POSView and PDS on board. Together with our US partner Multibeam Advisory Committee (MAC) servicing the US Academic Fleet SUMMARY OF PLANNED WORK: Summary of planned work for the next 24 hours Update settings to new coordinate system New test off Nuuk Start of survey if successful WEATHER AND SEA STATE: LAST 24 HRS: Severe storm came at 13:00 local time FORECAST 24 HRS: Storm will end c. 14:00, Dec 3, 2022 SIGNIFICANT EVENTS THE LAST 24 HOURS: Notes on: samplings, start and finish of sections, technical breakdowns or other issues, safety issues, navigation events, activities from fishery, shipping or other offshore activities. 08:00 Start of office work 13:00 Severe weather started 14:00 Break 15:00 Visit at vessel for configuration 16:00 End of day 4. Daily Project Reports 32 Page 3 of 4 LAST SAVED: 02-01-2023 15:22:00 (local time) TIME STATISTICS Time spent on effective work during each 24 hour period and cumulative total.(ship time, not man hours) Activity Last 24 hours Cummulative Comments/notes Mobilization/demob. 8 32 Vessel RF calculations In transit 0 0 WDT standby 16 16 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 24 48 TIME ON DAY RATE Mobilization/demob. 0 0 In transit / survey 0 0 Weather Down Time 0 0 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 0 0 TOTAL SURVEY TIME 24 48 LENGTH STATISTICS (km) Survey track Proposed cable route SUMMARY OF SECTION SEABED MORPHOLOGY AND SURFACE GEOLOGY NA SEABED SUBSURFACE GEOLOGY NA OTHER OBSERVATIONS NA 4. Daily Project Reports 33 Page 2 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) PROGRESS AND EVENTS SUMMARY OF WORK: Summary of the work performed during the preceding 24 hours Ending first line of Nuuk skærgård, ended at c. AC45 due to severe swells and waves, which gave air bobbles under the sonar. Returned along Eastern/Northern part of the main route. Took SVP near AC20. Area between AC25 and AC26 was not mapped due to signal or software failure. Was covered afterwards. Returned North through Nuuk Skærgård between AC45 and Anchor, East of the main track, turned on Anchor and returned South along the West side of the main track. SVP at AC19. Continued South. Meeting at 10:00 local time: Niklas, Karl, and Aqqaluk. Went through the intermediate bathymetry 5m grid model from start of survey to c. 2022-12-04 8:00. New areas were identified along the track for covering possible alternative routes. The weather forecast for the coming 24-48 hours is severe for the outer regions at around AC30, and not possible to cover in this survey. It was decided to try come as much South and offshore as possible and reasonable. The mapping work and general management of the survey including alternative measures was orally approved by Niklas. Niklas was presented with the daily reports until date, with no comments from his side, and they are considered as endorsed. Already at AC26 the waves were too large for reasonable mapping and air bubbles disturbed the signal. Return North on the East side of the track also covering the alternative routes, starting at AC25 at around 15:00 local time. SUMMARY OF PLANNED WORK: Summary of planned work for the next 24 hours Covering the alternative routes, and broadening the swath coverage north of AC26, and not covering areas near and south of AC26 due to weather. Approaching Nuuk at around 2022-12-05 12:00. Further backup procedures and preparation of intermediate models WEATHER AND SEA STATE: LAST 24 HRS: FORECAST 24 HRS: Severe weather, particularly offshore SIGNIFICANT EVENTS THE LAST 24 HOURS: Notes on: samplings, start and finish of sections, technical breakdowns or other issues, safety issues, navigation events, activities from fishery, shipping or other offshore activities. 05:45 UTC Severe weather with waves, giving air bubbles under keel. 11:30 SVP 16:30 SVP 20:15 SVP 01:15 Heavy waves giving air bubbles under keel 01:25 Survey northbound 03:00 SVP 03:00 Survey continuing Southbound 4. Daily Project Reports 40 Page 3 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) TIME STATISTICS Time spent on effective work during each 24 hour period and cumulative total.(ship time, not man hours) Activity Last 24 hours Cummulative Comments/notes Mobilization/demob. 0 36 In transit 0 0 WDT standby 0 24 Ship downtime 0 0 Other (comments) 0 0 Sampling work 0 0 Surveying work 0 0 Total time (24h) 0 60 TIME ON DAY RATE Mobilization/demob. 0 0 In transit / survey 0 1 Weather Down Time 0 0 Ship downtime 0 0 Other (comments) 0 0 Sampling work 4 5 Surveying work 20 30 Total time (24h) 24 36 TOTAL SURVEY TIME 24 96 LENGTH STATISTICS (km) Survey track None recorded Proposed cable route None recorded SUMMARY OF SECTION SEABED MORPHOLOGY AND SURFACE GEOLOGY None recorded SEABED SUBSURFACE GEOLOGY None recorded OTHER OBSERVATIONS None recorded 4. Daily Project Reports 41 Page 4 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) COMMENTS & ENDORSEMENT COMMENTS Deviations, additions, alterations from survey party chief Route between AC 25 and AC 26 not mapped during first run due to software malfunction. Covered in second run. Route from AC 45 and towards West and the ocean is not covered due to severe weather with swells and waves. REPRESENTATIVES’ COMMENTS Comments from the clients representative SIGNATURES Karl Zinglersen Niklas Carlsson Party chief Client representative Date: Date: 4. Daily Project Reports 42 Page 1 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) DAILY PROJECT REPORT REPORT NO.: 06 DATE: 2022-12-05 VESSEL: R/V Tarajoq VHF CALL SIGNAL: OYLD VESSEL TELEPHONE: +45 32421294 VESSEL E-MAIL: [email protected] PROJECT NAME: Tusass Connect Nuuk PROJECT NO.: 61014 / PARTY CHIEF: Karl Zinglersen PROJECT MANAGER: Helle Siegstad PARTY CHIEF email.: [email protected] RECEIVERS OF DAILY REPORTS: Name: Company: Email: Note: Mads H. Petersen Tusass [email protected] Project manager, Tusass Ture Jönsson (Tusass) [email protected] Advisor to project Steen Hansen Tusass [email protected] Head of Department Niklas Carlsson Baltic Offshore [email protected] Advisor to project Helle Siegstad GINR [email protected]l Head of Department POSITION AND OVERVIEW: Geographical position of the survey vessel at the time of the report and include an overview chart showing completed and non-completed sections. Position (Lat./Lon): Not recorded Section: Area name: Nuuk skærgård Overview chart insert: Northern part of Nuuk Skærgård. Survey of alternative routes near AC22 and AC20, as well as Anchor / AC14. Through the narrow strait to Malenebugten. 4. Daily Project Reports 43 Page 2 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) PROGRESS AND EVENTS SUMMARY OF WORK: Summary of the work performed during the preceding 24 hours During night 2022-12-04 to 22-12-05 covering the alternative routes near AC18 to AC23 moving North. Early 2022-12-05 covering alternative routes near AC13-16 and broadening the coverage between AC13 to AC06. SVP around AC08. Three times through the narrow strait towards Malenebugten, broadening the coverage to Qinngorput and further to Nuuk. Patch test by the end of the cruise. Six hours waiting for a harbor slot without luck. Transport with dinghy from anchorage to harbor. Six hours after anchoring subsequently. SUMMARY OF PLANNED WORK: Summary of planned work for the next 24 hours Start of data processing and reporting in office. WEATHER AND SEA STATE: LAST 24 HRS: FORECAST 24 HRS: SIGNIFICANT EVENTS THE LAST 24 HOURS: Notes on: samplings, start and finish of sections, technical breakdowns or other issues, safety issues, navigation events, activities from fishery, shipping or other offshore activities. 05:17 UTC Northbound survey 07:30 UTC Southbound survey 09:15 Direction East towards Nuuk 11:25 Narrow channel finished 11:45 Entering Malene Bugt region 13:11 SVP 14:00 Finishing survey near Nuuk 14:15 Starting calibrations of yaw 15:00 Ending calibrations of yaw 15:00 Waiting for harbor slot 21:00 UTC Dinghy to set survey crew and Tusass representative to harbor 4. Daily Project Reports 44 Page 3 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) TIME STATISTICS Time spent on effective work during each 24 hour period and cumulative total.(ship time, not man hours) Activity Last 24 hours Cummulative Comments/notes Mobilization/demob. 0 36 In transit 0 0 WDT standby 0 24 Ship downtime 0 0 Other (comments) 6 6 Anchoring after survey Sampling work 0 0 Surveying work 0 0 Total time (24h) 6 66 TIME ON DAY RATE Mobilization/demob. 1 1 Yaw calibration check In transit / survey 0 1 Weather Down Time 0 0 Ship downtime 0 0 Other (comments) 6 6 Waiting for harbor slot Sampling work 1 6 Surveying work 10 40 Total time (24h) 18 54 TOTAL SURVEY TIME 24 120 LENGTH STATISTICS (km) Survey track Not recorded Proposed cable route Not recorded SUMMARY OF SECTION SEABED MORPHOLOGY AND SURFACE GEOLOGY Not recorded SEABED SUBSURFACE GEOLOGY Not recorded OTHER OBSERVATIONS Not recorded 4. Daily Project Reports 45 Page 4 of 4 LAST SAVED: 02-01-2023 15:23:00 (local time) COMMENTS & ENDORSEMENT COMMENTS Deviations, additions, alterations from survey party chief REPRESENTATIVES’ COMMENTS Comments from the clients representative SIGNATURES Karl Zinglersen Niklas Carlsson Party chief Client representative Date: Date: 4. Daily Project Reports 46 Appendix 5 Summary of equipment breakdown or repairs During mobilization and survey no breakdown was reported or repairs needed. Note: From the results from tests 30th of November and 1st of December near Nuuk it was required to reestablish the vessel reference coordinate system including change of reference frame and instrument positioning information in positioning and sonar aquisition software using information from the dimensional control survey carried out by ANKO earlier in 2022. The dimensional control survey by ANKO was conducted instead of the original dimensional control survey, which involved serious issues. The revised calculations of the vessel reference coordinate system and instrument positioning and new patch test on 3rd of December provided a strong solution of offsets, meaning that the corrections for roll, pitch and yaw were minimal. 5. Summary of equipment breakdown or repairs 47 Appendix 6 Bibliography Anon., 2012. Seamless digital 1:500 000 scale geological map of Greenland, Geological Survey of Denmark and Greenland (GEUS), https://data.geus.dk/MetaVis/Klik.jsp?id=2378&lang=en&lang=en Anon., 2021. Den grønlandske Lods. Sejladsanvisninger Vestgrønland. Ajourført til SKR 1-2/2021, Geodatastyrelsen. https://gst.dk/media/7013/181109_dgl_vestgronland_dk_skr_1_2_2021.pdf Anon., 2021: Report. Tarajoq. Dimensional Survey Report. Surveyed at VARD Søviknes in Søvik, Norway. Anko Maritime AS. Client: Greenland Institute of Natural Resources. Document reference: 2206009-003. Dowdeswell, J. A., Canals, M., Jakobsson, M., Todd, B. J., Dowdeswell, E. K., & Hogan, K. A., (eds) 2016. Atlas of Submarine Glacial landforms: Modern, Quaternary and Ancient. Geological Society, London, Memoirs, 46, http://doi.org/10.1144/M46. Ghetta, M. et al., 2022, Data Plotly, D3 plots for QGIS. Plugin to QGIS3, release 3.9.2. https://github.com/ghtmtt/DataPlotly Goudie, A., 2014. Alphabetical glossary of geomorphology. International Association of Geomorphologists, GLOSSARY_OF_GEOMORPHOLOGY1.pdf Freire, F.F., 2016. High Arctic submarine glaciogenic landscapes. Doctoral Thesis in Marine Geology at Stockholm University, Sweden 2016. Meddelanden från Stockholm Universitets Institutionen för geologiska vetenskaper No. 360. ISBN: 978-91-7649-367-0, diva2:907168, http://su.divaportal.org/smash/get/diva2:907168/FULLTEXT03.pdf Jakobsson, M., L Mayer, C Bringensparr, C Castro, R Mohammad, P Johnson, T Ketter, D Accettella, D Amblas, L An, J E Arndt, M Canals, J Casamor, N Chauché, B Coakley, S Danielson, M Demarte, M-L Dickson, B Dorschel, J Dowdeswell, S Dreutter, A Fremand, D Gallant, J Hall, L Hehemann, H Hodnesdal, J Hong, R Ivaldi, E Kane, I Klaucke, D Krawczyk, Y Kristoffersen, B Kuipers, R Millan, G Masetti, M Morlighem, R Noormets, M Prescott, M Rebesco, E Rignot, I Semiletov, A Tate, P Travaglini, I Velicogna, P Weatherall, W Weinrebe, J Willis, M Wood, Y Zarayskaya, T Zhang, M Zimmermann, and K Zinglersen (2020): The International Bathymetric Chart of the Arctic Ocean Version 4.0, Nature Scientific Data (Paper #SDATA-20-00261A) QGIS Development Team, 2022. QGIS v. 3.28. QGIS Development Team (2022). QGIS Geographic Information System. Open Source Geospatial Foundation Project. http://qgis.org 6. Bibliography 49 Appendix 7 6 of 6 B. For the landing points in Qinngorput – END HDD of both Nuuk Ring, it is proposed to move the END HDD of Nuuk Ring to the SW, as the branch pipes of the sewer system indicates that the municipality is planning construction sites for housing near the END HDD of Nuuk Ring, which should be moved, Figure 4. C. For the landing point for Nuuk Skærgård, it is closely intersecting with the sewer outlet. It is advised to move the location to a place near the END HDD of Nuuk Ring, Figure 4. Figure 4: Landing point near Qinngorput. Technical Base Map from Asiaq Greenland Survey displays a road and built up ground, and the sewer chart displays a main pipe, an marine outlet and a number of branch pipes. 7. Pipeline Crossing Report 56