2000 Volume 44 Pages 963-968
In this study, 2-dimensional numerical simulations were carried out in order to make clear the mechanism of salinity intrusion in a well-mixed type estuary. As a result, the following findings were obtained; 1) It was made clear that there are twin tide-induced residual circulations in the sea area near the river mouth. 2) The substance transport mechanism in a model estuary was clarified by means of the particle tracking simulations. 3) The results of numerical simulation, which can correctly reproduce the salinity intrusion in the laboratory experiments, show that the tide-induced residual circulations contribute to not only the salt balance near the river mouth but also salinity intrusion length as a tidal pumping effect.
