Author(s): B. F. Chen; S. M. Hsu
Linked Author(s):
Keywords: Seawater intrusion; Tidal effects; Unconfined aquifer; Finite-difference method
Abstract: This study presents a two-dimensional time-independent finite difference model to simulate tidal effects on the intrusion of seawater in either a confined or phreatic aquifer. The model considers the sloped beach face and tidal effects. The dominant feature of confined aquifer is that seawater intrudes inland during the flood tide. The saltwater continues to intrude further inland and reaches its furthest upstream position at ebb tide. In an unconfined aquifer, the tidal fluctuation causes the variation of intrusive profile only in the vertical direction. The fluctuation of the water table oscillates according with the fluctuating tide with a time lag, but the influence of the tide is damped out with horizontal distance from the beach. The shape of the aquifer also affects the intrusion of saltwater and the velocity of intrusion.
Year: 2003