Three-Dimensional Numerical Simulation of Salinity Intrusion and Instability Condition of Salt Wedge Considering Tidal Motion

Abstract

This paper deals the computation and observation results concerning density current in Abashiri River, which is a tidal river. Three-dimensional numerical simulation of salinity intrusion was carried out. And a new computational technique is proposed. The calculated vertical profiles of velocity and density represent good agreement qualitatively with the results observed in Abashiri River. We proposed the instability condition of salt wedge under the influence of tidal motion. We found that the condition could apply to the salt wedge observed in Abashiri River.