P oceedings
J,ne21-2612010
SWI M21
Azo es·
Po ugal
21s
Sa~
Wa e
In usion
Mee ing
Tempo ale olu iono ma inein usionando he saliniza ion
p ocessesin he olcanic‐sedimen a yaqui e o  heeas o G an
Cana ia(Cana yIslands,Spain)
J.He nández1,N.Boluda‐Bo ella1,M.C.Cab e a2andE.Cus odio3
1Depa men o ChemicalEnginee ing,Uni e si yo Alican e,Spain
2Depa men o Physics,Uni e si yo lasPalmasdeG anCana ia,Spain
3Depa men o Enginee ing,Uni e si yo Ca alonia,Spain
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ABSTRACT

Thecoas al olcanic‐sedimen a yaqui e o  heEas o G anCana iahassu e eda
p og essi esaliniza ionp ocesssince he1960’s ha hasbeena ibu ed oin ensi e
exploi a ion.I isasec o o  heinsula aqui e cha ac e izedasacomplex,
he e ogeneousandmul ilaye aqui e inwhichg oundwa e  lows om hehighpa si 
heisland owa ds hecoas .Discha geismos lyindi use o m.Unde na u al
condi ions heaqui e discha gedalsoassp ingsin hebo omo  hemaingullies,bu 
cu en ly hisdischa gehasbeensubs i u edbyexploi a ionwells(Cab e ayCus odio,
2004).

Thes udya eaisloca eda  heEas o G anCana iaIsland.Thea e age ain allis345
mm, anging om900mmin heuppe pa o  hezone(1800masl) o100mmin he
coas ,and hea e ageyea ly empe a u eis24ºC.Thisa eahasbeen adi ionally
dedica ed oin ensi e,i iga edag icul u e(mainly oma oesin he20 hCen u y)wi h
wa e  om heuppe pa o  heislandand om helocalaqui e ,bu  hesca ci yand
p og essi esaliniza iono g oundwa e is hecauseo ag icul u eabandoning.

Cu en ly, heexploi edma e ialsin hea eaa emos lyMiocenebasal sandphonoli es
(Cab e a,1995).Pliocenebasal s( olcanicagglome a esandla a lowso  heRoque
NubloG oup)andQua e na ybasal s(Recen Basal s)a elocallyexploi edinsome
poin sa  heuppe pa o  hea ea.Theunsa u a edzoneconsis so RoqueNublo,
Recen basal sandde i ic o ma ionsinmos o  hea ea.Thesewe e heaqui e 
ma e ialsunde na u alcondi ions,be o edewa e le eld awdown.

The eisanimpo an hyd ogeologicalda abase ha hasbeenp o idedby heWa e 
au ho i ieso  heisland.I includespiezome icandchemicalda a( ieldmeasu emen s
andlabo a o ywa e analysis) om1970 o1999.Th eepiezome icmapsha ebeen
econs uc ed(1970‐76;1980‐89and1990‐1999).Ex ensi ea easwi had awdown o
60mbelowseale elha ebeeniden i ied,co espondingwi h hemo eexploi eda eas
(locally,somewellswen down o100mbslin1992).Thee olu iono  hewa e able
showsap og essi ed awdown om1970 o1999,wi h hede elopmen o  ou sha p
d awdownconesa  hecoas alplane.

Thehyd ogeochemicals udyhasincluded hecons uc iono se e alhyd ogeochemical
mapsand he heo e ical(closedsys em)wa e mixingcalcula ions.G oundwa e 
a ainselec icalconduc i i iesup o10mS/cma  hesou hdeepd awdowncones,bu 
no a  heno ho  hea ea.Theanalysiso hyd ogeochemicalin o ma ionallows o
Azo es, Po ugal
SWIM21 - 21s Sal Wa e In usion Mee ing
June 21 - 26, 2010
103
iden i yanac i ema inein usionin hea ea,bu also heexis enceo o he 
saliniza ioncauses: e u ni iga ion lowsand hee ec o wea he ingby olcanicCO2
con ibu ionsin wolocalizeda eas.Thecon ibu iono b ackish echa gewa e sdue o
hea idi yo  hezonemus bealsoconside edasana u alcauseo salini ya  hesou h
o  hea ea.

Wa e supplyquali yp oblemsha ebeensol edbymeanso  e e seosmosis acili ies
in hemo ep oduc i ewellsand heuseo seawa e desalina ion o popula ionsupply,
bu  heaqui e saliniza ionhasno beena es edin he ecen yea s.Awides udyhas
beenca iedou by heSpanishGeologicalSu ey(IGME)and heWa e Au ho i yo 
heIslandino de  odecla edeaqui e aso e exploi ed.I isconside edin heSpanish
Wa e Legisla ion ha allowscon olling heexploi a iona  hewellsincoas alaqui e s
ominimizeseawa e in usion.In hiscase, hedi icul  ocha ac e ize hisp ocess
due o hecomplexgeologyand heexis enceo di e en salini yo iginshasp e en ed
hedecla a ion.
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Thisabs ac isbasedon hewo ko He nández‐Ma ín(2009),unde  hesupe isiono 
heo he au ho s.
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REFERENCES
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Cab e a,M.C.1995.Ca ac e izacióny uncionamien ohid ogeológicodelacuí e o
cos e odeTelde(G anCana ia),Doc o alThesis,Uni e si yo Salamanca,
Spain.

Cab e a,M.C.andCus odio,E.2004.G oundwa e  lowina olcanic–sedimen a y
coas alaqui e :Teldea ea,G anCana ia,Cana yIslands,Spain.Hyd ogeology
Jou nal,12:305‐320.

He nández‐Ma ín,J.A.2009.Ca ac e izaciónhid ogeoquímicaye olución empo alde
lain usiónma inayo osp ocesosdesalinizaciónenelacuí e o olcánico‐
sedimen a iodelEs edeG anCana ia.Enginee ingGeologyP ojec  o 
g adua ion.Uni e si yo Alican e.


Con ac In o ma ion:M.Ca menCab e a.Uni e sidaddeLasPalmasdeG anCana ia.
[email p o ec ed]
Azo es, Po ugal
SWIM21 - 21s Sal Wa e In usion Mee ing
June 21 - 26, 2010
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