Author(s): Makoto Ifuku
Linked Author(s):
Keywords: Tidal motion; Saline intrusion; Time-dependent diffusivity; Modifiedestuarine Richardson number
Abstract: There have been few studies of salt wedge instability under the influence of tidal motion and of the behavior of interfaces and interface instability conditions 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 turbulent 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 or ebb tides in the estuary. The location of isohalines changes periodically with variations in tide and depending upon the modified estuarine Richardson number proposed by Fischer.
Year: 1999