Abstract

AbstractIt is vital to outline the mechanisms of recharge of aquifers as far as water resources management is concerned. Monitoring variations in isotopic signatures (δ18O and δ2H) can provide us with valuable inputs on groundwater recharge processes. In the present study, the stable isotope (δ18O and δ2H) contents of groundwater, rainwater, and surface waters from the Northern parts of Kelantan, Malaysia, were employed to trace the recharge processes. In the Kelantan area, the recharge of shallow groundwater is mainly due to precipitation from northeast monsoon. The recharge mechanisms for shallow groundwater, especially in low-lying areas, are the infiltration of surface water. The primordial isotopic signatures (pre-evaporation) of post-season groundwater samples fall well within the isotopic range of post-season rainwater, signifying direct recharge from precipitation without any major fractionation. The narrow isotopic range for post-season implies that groundwater recharge for post-season occurs during a limited interval compared to pre-season. The aquifer in the area is isotopically heterogeneous and shows enrichment towards north-west during post-season and south-east during pre-season.KeywordsMechanismGroundwater rechargeEnvironmental isotopesMalaysia

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