2004 Volume 46 Issue 4 Pages 299-313
Dynamics of saltwater intrusion in a coa s tal aquifer near the tidal river is dependent on the temporal variations of both sea and river water levels. Composite effects of sea and tidal river, however, are difficult to isolate quantitatively on the basis of the field measurements conducted under ordinary conditions. In this study, special conditions were created in which the variation of water level of a tidal river was kept to be fixed by closing the river gates for a certain time. Field measurements were performed to investigate the spatial and temporal variations of saltwater intrusion in an aquifer. The contribution of tidal river to saltwater intrusion was isolated by comparing the acquired data with the data obtained under the ordinary conditions. The observations were verified by numerical simulation based on the sharp interface between fresh and saline groundwater and some suggestions were pointed out on the practical operations of river gates.
