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Sagami River is one of major rivers in Japan and river water has been utilized over the last few decades, so the flow rate passing river mouth had been decreasing considerably. Therefore, there is a great concern that the water quality becomes worse and bad effect on the ecosystem is caused.In this study, numerical simulation was done according to the two-dimensional k-e turbulent model with the inflow being applied in the cross-sectional direction. In general, results agreed well with the measurement results, namely, for transitions between weak and moderate mixed type were in good agreement. Next, the numerical experiment was done by varying the upstream flow rate. As a result, it was shown that the salt water tended to go further in the downstream when the flow rate was increased, and the exchange of the water was promoted.

A NUMERICAL SIMULATION OF SALT WATER BEHAVIOR IN THE DOWNSTREAM REACH OF SAGAMI RIVER WITH A VERTICAL 2-D MODEL