Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia

Tajul Baharuddin, M.F. and Taib, S. and Hashim, Roslan and Zainal Abidin, M.H. and Ishak, M.F. (2011) Time-lapse resistivity investigation of salinity changes at an ex-promontory land: a case study of Carey Island, Selangor, Malaysia. Environmental Monitoring and Assessment, 180 (1-4). pp. 345-369. ISSN 01676369, DOI https://doi.org/10.1007/s10661-010-1792-x.

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Time-lapse resistivity measurements and groundwater geochemistry were used to study salinity effect on groundwater aquifer at the ex-promontory-land of Carey Island in Malaysia. Resistivity was measured by ABEM Terrameter SAS4000 and ES10-64 electrode selector. Relationship between earth resistivity and total dissolved solids (TDS) was derived, and with resistivity images, used to identify water types: fresh (ρ e > 6.5 Ω m), brackish (3 Ω m < ρ e < 6.5 Ω m), or saline (ρ e < 3 Ω m). Long-term monitoring of the studied area's groundwater quality via measurements of its time-lapse resistivity showed salinity changes in the island's groundwater aquifers not conforming to seawater-freshwater hydraulic gradient. In some aquifers far from the coast, saline water was dominant, while in some others, freshwater 30 m thick showed groundwater potential. Land transformation is believed to have changed the island's hydrogeology, which receives saltwater pressure all the time, limiting freshwater recharge to the groundwater system. The time-lapse resistivity measurements showed active salinity changes at resistivity-image bottom moving up the image for two seasons' (wet and dry) conditions. The salinity changes are believed to have been caused by incremental tide passing through highly porous material in the active-salinity-change area. The study's results were used to plan a strategy for sustainable groundwater exploration of the island.

Item Type: Article
Additional Information: Cited By (since 1996):2 Export Date: 16 December 2013 Source: Scopus CODEN: EMASD PubMed ID: 21136290 Language of Original Document: English Correspondence Address: Tajul Baharuddin, M.F.; Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia; email: mdfaizal@uthm.edu.my Chemicals/CAS: Water Pollutants, Chemical
Uncontrolled Keywords: Ex-promontory land, Groundwater chemistry, Salinity, Time-lapse resistivity, Earth resistivity, Groundwater aquifer, Groundwater quality, Groundwater system, Hydraulic gradients, Land transformation, Long term monitoring, Malaysia, Resistivity measurement, Salinity change, Salinity effects, Sustainable groundwater, Total dissolved solids, Water types, Wet and dry, Aquifers, Groundwater resources, Hydrogeology, Landforms, Porous materials, Salinity measurement, Seawater, Water quality, Groundwater geochemistry, ground water, aquifer, electrode, freshwater, geochemistry, groundwater, analytical parameters, article, hydrology, monitoring, seashore, time lapse resistivity, Environmental Monitoring, Fresh Water, Seasons, Water Cycle, Water Pollutants, Chemical, Water Supply, Carey Island, Selangor, West Malaysia
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 18 Feb 2014 02:13
Last Modified: 31 May 2019 05:06
URI: http://eprints.um.edu.my/id/eprint/8860

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