Record number :
2320343
Title of article :
Isotopic and Geochemical Tracers in the Evaluation of Groundwater Residence Time and Salinization Problems at Santiago Island, Cape Verde
Author/Authors :
Carreira، نويسنده , , Paula M. and Marques، نويسنده , , José M. and Nunes، نويسنده , , Dina and Santos، نويسنده , , Fernando A. Monteiro and Gonçalves، نويسنده , , Rui and Pina، نويسنده , , Antَnio and Gomes، نويسنده , , Antَnio Mota، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
5
From page :
113
To page :
117
Abstract :
Stable isotopes (δ18O, δ2H) and tritium (3H), together with geochemistry and geophysical data, were used for evaluating groundwater recharge sources, flow paths, and residence times in a watershed on Santiago Island, Cape Verde, West Africa. Stable isotopes indicate the predominance of high-elevation precipitation that undergoes little evaporation prior to groundwater recharge. Low tritium concentrations at seven sampling sites indicate groundwater residence times greater than 50 years. Higher tritium values at other locations suggest more recent recharge. Young ages indicate local recharge and potential groundwater vulnerability to surface contamination and/or salt-water intrusion. Geochemical results indicate that water–rock interaction mechanisms are the major processes responsible for the groundwater quality (mainly calcium-bicarbonate type), reflecting the lithological composition of subsurface soil.
Keywords :
Santiago Island , Cape Verde - West Africa , Groundwater age , Groundwater quality , Seawater intrusion , stable isotopes
Journal title :
Procedia Earth and Planetary Science
Serial Year :
2013
Link To Document :
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