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This paper describes the application of the MEL1D-MB to duplicate the discharge and salinity at the upstream end of River Takase which has a large shallow water area in the middle of the river. Because of the large tidal amplitude compared to the maximum water depth of the river that is almost one third of the maximum water depth, it may be difficult to compute the flow field of River Takase by using ordinal three-dimensional model based on finite difference method. However, the model based on finite volume method may enable us to compute the flow field with high accuracy of the conservation of mass. Therefore, we decided to apply the MEL1D-MB based on finite volume method to compute salinity distribution in River Takase. The results obtained from the MEL1D-MB agreed well with the field observation results and the application of the MEL1D-MB is found to be possible to reproduce the salinity distribution in River Takase.

AN INFLUENCE OF A SHALLOW WATER AREA ON THE SALT WATER INTRUSION IN RIVER TAKASE