Groundwater recharge mechanisms inferred from isoscapes in a complex tropical mountainous region

 

Guardado en:
Detalles Bibliográficos
Autores: Sanchez-Murillo, Ricardo, Birkel, Christian
Formato: artículo
Fecha de Publicación:2016
Descripción:Stable isotope variations and groundwater recharge mechanisms remain poorly understood across the tropics, particularly in Central America. Here stable isotopes (δ18O and δ2H) in groundwater, surface water, and rainfall are used to produce high-resolution (100m2 grid) isoscapes for Costa Rica, from which an isotope ratio of precipitation to groundwater (P/GW) is estimated to elucidate the dominant groundwater recharge processes. Spatially, groundwater and surface water isotope ratios depict the strong orographic separation into the Caribbean and Pacific slopes induced by moisture transport directly from the Caribbean Sea and the eastern tropical Pacific Ocean. P/GW isotope ratios reveal that groundwater recharge is biased toward intensive and more depleted monthly rainfall across the Pacific slope with clear evidence of secondary evaporation indicating slower soil matrix recharge processes. On the other hand, P/GW isotope ratios indicate a weak influence of secondary evaporation across the Caribbean slope suggesting rapid recharge via preferential flow paths,
País:Repositorio UNA
Institución:Universidad Nacional de Costa Rica
Repositorio:Repositorio UNA
Lenguaje:Español
OAI Identifier:oai:https://repositorio.una.ac.cr:11056/20559
Acceso en línea:http://hdl.handle.net/11056/20559
Access Level:acceso abierto
Palabra clave:ISOTOPOS
AGUAS SUBTERRÁNEAS
COSTA RICA
CARIBE
PACÍFICO
ISOTOPES
GROUND WATERS