Kohei KIYOTA

A Numerical Study on Two-dimensional Tidal Simulation in Tokuyama Bay

Tokuzou HOSOYAMADA


Tokuyama Bay is located at the inside of the Seto Inland Sea, Japan. The bathymetry of this domain has the characteristic of the small entry mouth, the large body and the flat bottom. However the tidal flow is prevalent around this domain, the tidal excursion is very small at the inside of this bay. Therefore, there is a heavy pollutant problem and it is very important to know the mechanisms of the tidal exchange to solve this problem. This study tried to know how the environmental condition include the water quality becomes to be good by changing the tidal exchange.
This study simulated the tidal flow and the tidal exchange by using the two-dimensional finite difference model, firstly, in the simplified geography, and secondary, in the Tokuyama Bay. These numerical experiments are made sure of the correctness by comparing with the hydraulic experiment and the observed data in the Tokuyama Bay.

These results show that the tidal exchange becomes to be big if the depth, around the entry of the bay, changes to be shallow. It means that there is a possibility of the environmental condition inside of the bay to be good.