Author(s)

Makoto Ifiiku

Abstract

There have been few studies on salt wedge instability under the influence of tidal motion and the behavior of interfaces and interface instability con- ditions when tide propagates up rivers. To clarify these phenomena, it is necessary to carry out analysis with a vertical two-dimensional or three- dimensional numerical model. Further, the modeling of tide effects at the upstream boundary is an important issue. We carry out numerical analysis on the saline intrusion caused by propagation of tide, with two-dimensional Reynolds and diffusion equations used as the governing equations. It proves possible to explain the temporal variation of surface level as well as the vertical structure of flow and salinity during flood and ebb tides in the estu- ary. The location of isohalines changes periodically with variations in tide a

Keywords