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Physical model simulations of seawater intrusion in unconfined aquifer

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Author(s): Tanapol Sriapai | Chaowarin Walsri | Decho Phueakphum | Kittitep Fuenkajorn

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 34;
Issue: 6;
Start page: 679;
Date: 2012;
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Keywords: seawater intrusion | physical model | salinity | aquifer | groundwater pumping

ABSTRACT
The objective of this study is to simulate the seawater intrusion into unconfined aquifer near shoreline and to assessthe effectiveness of its controlling methods by using scaled-down physical models. The intrusion controlled methods studiedhere include fresh water injection, saltwater extraction, and subsurface barrier. The results indicate that under natural dynamicequilibrium between the recharge of fresh water and the intrusion well agree with the Ghyben-Herzberg mathematical solution.Fresh water pumping from the aquifer notably move the fresh-salt water interface toward the pumping well, depending on thepumping rates and the head differences (h) between the aquifer recharge and the salt water level. The fresh water injectionmethod is more favorable than the salt water extraction and subsurface barrier method. The fresh water injection rate of about10% of the usage rate can effectively push the interface toward the shoreline, and keeping the pumping well free of salinity.
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