Tanaphol Sriapai, Chaowarin Walsri, Decho Phueakphum, and Kittitep Fuenkajorn

pp. 679 - 687

Abstract

The objective of this study is to simulate the seawater intrusion into unconfined aquifer near shoreline and to assess
the effectiveness of its controlling methods by using scaled-down physical models. The intrusion controlled methods studied
here include fresh water injection, saltwater extraction, and subsurface barrier. The results indicate that under natural dynamic
equilibrium 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 the
pumping rates and the head differences (h) between the aquifer recharge and the salt water level. The fresh water injection
method is more favorable than the salt water extraction and subsurface barrier method. The fresh water injection rate of about
10% of the usage rate can effectively push the interface toward the shoreline, and keeping the pumping well free of salinity