Evaluating freshwater lens morphology affected by seawater intrusion using chemistry-resistivity integrated technique: a case study of two different land covers in Carey Island, Malaysia

Freshwater lenses are vital to small island communities but are susceptible to seawater intrusion due to the physical changes in the shoreline land cover. The effect of seawater intrusion and irrigation water on a coastal unconfined aquifer beneath naturally preserved mangrove and deforested mangrov...

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Bibliographic Details
Published in:Environmental earth sciences 2013-08, Vol.69 (8), p.2779-2797
Main Authors: Tajul Baharuddin, M. F, Othman, A. R, Taib, S, Hashim, R, Zainal Abidin, M. H, Radzuan, M. A
Format: Article
Language:English
Subjects:
aquifers
Biogeosciences
case studies
Chemical analysis
Chemistry
Coastal aquifers
Deforestation
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Environmental Science and Engineering
Exact sciences and technology
forests
Fresh water
freshwater
Freshwater ecology
Freshwater lenses
Geochemistry
Geology
Hydrogeology
Hydrology
Hydrology. Hydrogeology
Hydrology/Water Resources
Irrigation water
Islands
land cover
Land use
Original Article
Saline water intrusion
saltwater intrusion
Seawater
Shorelines
Terrestrial Pollution
Total dissolved solids
Unconfined aquifers
Water analysis
Water resources
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Summary:Freshwater lenses are vital to small island communities but are susceptible to seawater intrusion due to the physical changes in the shoreline land cover. The effect of seawater intrusion and irrigation water on a coastal unconfined aquifer beneath naturally preserved mangrove and deforested mangrove-barren belt was investigated in Carey Island. Analysis of the total dissolved solids (TDS) and earth resistivity (ER) using a geochemistry-electrical integrated technique gave a TDS–ER relationship capable of predicting freshwater lens morphology affected by sea-irrigation water. The study result shows freshwater was fourfold thicker in close proximity of the mangrove forest than the mangrove barren area; the further the shoreline from the mangrove thickest section, the less vulnerable was the seawater intrusion and the more fresh the irrigation water, and hence the greater the freshwater availability potential.
ISSN:1866-6280
1866-6299
DOI:10.1007/s12665-012-2098-9