河口感潮域の流れと拡散の数値シミュレーション

Abstract

The objective of the paper is to develop a numerical simulation model which deals with the transi-tion behaviours of intrusion type of salinity in tidal estuaries.The equations which express the flows and the dispersion of salinity are simultaneously solvedby introducing the relation that the vertical eddy diffusivity is a function of Richardson number.Numerical results applied to a simplified estuary model shows that the model obtained here canrealize three intrusion types, namely well mixed, partially mixed and two-layered ones with thecyclic change of tidal amplitude.