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Multi-isotopic and hydrochemical evidence of water resources evolution and recharge estimation in the tropical coastal aquifer
Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland, Powstańców Warszawy 55.
Department of Geology, University of Malaya, 50603 Kuala Lumpur, Selangor, Malaysia, Selangor.
Hubert H. Humphrey Fellowship Program, Global Affairs, University of California, Davis, CA, United States.
Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Selangor, Malaysia, Selangor.
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2024 (English)In: Groundwater for Sustainable Development, E-ISSN 2352-801X, Vol. 24, article id 101065Article in journal (Refereed) Published
Abstract [en]

The study integrates hydrochemical and isotopic (δ18O, δ2H, 3H, and δ13C) techniques to investigate water evolution in the North Kelantan River basin. Groundwater facies were mainly classified as Ca–Mg–Cl, Ca–Mg–Cl–HCO3, and Na–Cl during the rainy season and shift toward Ca–Mg–HCO3 and Na–Ca–HCO3–Cl during the dry season in surface water and shallow aquifer, while facies in intermediate and deep aquifers were classified as Na–HCO3 and Na–Cl. The δ18O and δ2H compositions of most groundwater samples have not deviated significantly from NKMWL (δ2H = 8.4 δ18O + 11.5) with slightly depleted isotopic values due to the humid climate. Isotopically, evaporation does not impact recharged water significantly. However, shallow aquifers are slightly enriched than deep aquifers of the study area. The estimated recharge was 20.17% and 22.52% of annual rainfall based on the CMB and δ18O values, respectively. The recharge mainly occurs during the wet season and is influenced mostly by the amount of rain. Aquifers clustered in distinct groups based on their isotopic signatures and hydrochemical results. The decomposition of organic matter is the primary carbon source in the study area. Building on this, by utilizing isotope hydrology to study water resources, we can gain a deeper insight into the susceptibility of groundwater in coastal aquifers of monsoonal tropical humid regions.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 24, article id 101065
Keywords [en]
Environmental isotopes, Hydrochemistry, North kelantan basin, Recharge estimation, Seasonality, Tropical coastal aquifer
National Category
Oceanography, Hydrology and Water Resources
Identifiers
URN: urn:nbn:se:kth:diva-342185DOI: 10.1016/j.gsd.2023.101065ISI: 001150248500001Scopus ID: 2-s2.0-85181154662OAI: oai:DiVA.org:kth-342185DiVA, id: diva2:1827912
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QC 20240115

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-02-13Bibliographically approved

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Bhattacharya, Prosun

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