Groundwater assessment at Manukan Island, Sabah: Multidisplinary approaches

Sarva Mangala Praveena and C. Y., Lin and Ahmad Zaharin Aris and Mohd Harun Abdullah (2010) Groundwater assessment at Manukan Island, Sabah: Multidisplinary approaches. Natural Resources Research, 19 (4). pp. 279-291. ISSN 1520-7439


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A rapid increase in the number of tourists has placed a heavy demand for freshwater on Manukan Island, a small island located offcoast of Kota Kinabalu, Sabah. Hydrochemical and numerical approaches have been applied in this study to evaluate the groundwater quality of unconfined aquifer lying in Manukan Island, Sabah, East Malaysia. This is vital to enhance better understanding about groundwater management. Hydrochemical analysis output indicated NaCl water type in sampling locations. Seawater intrusion is marked by its relatively high Na+, Mg2+, Cl- and SO42- concentrations. Hydrochemical analysis output clearly showed the influence of seawater in groundwater of Manukan Island. The numerical model output proved the influence of seawater in groundwater of Manukan Island by indicating the upconing process at the beneath of the pumping well. Current status of seawater intrusion in Manukan Island is about 14.6% of freshwater and seawater mixing ratio in low lying area of Manukan Island as simulated by SEAWAT-2000 model output. Numerical model SEAWAT-2000 output showed clearly that the upconing process is the possible route of seawater to influence the fresh groundwater aquifer chemistry in Manukan Island. The results have enhanced the current understanding of seawater intrusion in the study area. Future studies will focus on using numerical models to simulate and suggest suitable groundwater management plans in Manukan Island. © 2010 International Association for Mathematical Geology.

Item Type: Article
Keyword: Hydrochemical, Numerical model, Seawater intrusion, Shallow groundwater, Small island
Subjects: G Geography. Anthropology. Recreation > GB Physical geography > GB3-5030 Physical geography > GB651-2998 Hydrology. Water > GB980-2998 Ground and surface waters > GB1001-1199.8 Groundwater. Hydrogeology
Q Science > QH Natural history > QH301-705.5 Biology (General) > QH540-549.5 Ecology
Department: SCHOOL > School of Science and Technology
Depositing User: ADMIN ADMIN
Date Deposited: 01 Mar 2011 14:50
Last Modified: 20 Oct 2017 14:34

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