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Integration of geochemical and geophysical approaches for the assessment of seawater intrusion on groundwater for agricultural purposes

Tajul Baharuddin, Mohamad Faizal (2015) Integration of geochemical and geophysical approaches for the assessment of seawater intrusion on groundwater for agricultural purposes. PhD thesis, Universiti Malaya.

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Abstract

Groundwater contamination is a serious issue because it depletes fresh groundwater resources. Groundwater resources in coastal areas are susceptible to seawater intrusion given its close proximity to sea. Seawater intrusion can induce salinity, which affects groundwater resources and agriculture activities along coastal areas. This situation becomes more severe in island coastal areas as the primary water resources are mainly from freshwater lenses. This study aims to assess the impact of seawater intrusion into groundwater aquifer and agriculture activities in island coastal areas. Groundwater salinity in a Malaysia island coastal area was assessed by using a geo-electrical-and-geochemical integrated technique in combination with surface and subsurface hydrogeology study. The effect of groundwater salinity on the agricultural cultivations, especially of oil palm plants, has not been examined previously. The integrated technique was applied to the coastal area of Carey Island in Selangor, Malaysia, which is the biggest island in Malaysia whose inhabitants cultivate oil palm plants as a major income source. A large part of the island (the west and south areas) is near the Straits of Malacca and is thus exposed to seawater intrusion, which can deteriorate the quality of the fresh groundwater aquifer. A subsurface hydrogeology study revealed that the aquifer system in Carey Island consists of semi-confined and unconfined aquifer systems. The unconfined aquifer (sandy material) was located at the edge of Carey Island (near the sea). The amount of total dissolved solids (TDS) in groundwater of unconfined aquifer in the east was twice that in groundwater in the west. Groundwater chemistry, conductivity, and time lapse electrical resistivity tomography measurements showed that groundwater in this area was affected by seawater. The integrated technique established the relationship between subsurface resistivity and geochemistry and generated an empirical equation.

Item Type: Thesis (PhD)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1-163 Engineering (General). Civil engineering (General)
Divisions: Faculty of Civil and Environmental Engineering > Department of Water and Environmental Engineering
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 21 Sep 2017 02:57
Last Modified: 21 Sep 2017 02:57
URI: http://eprints.uthm.edu.my/id/eprint/9325
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