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The quantity of silt-clay in soil is very significant for benthos to live, so a simulation technique which can predict the movement of soil included silt-clay will be effective to develop tidal flat. In this paper, we took the interaction between fluid and soil into consideration, and calculated to verify how soil and fluid move under tidal current, wind wave, and both of them by “N-dispersed phase two flow model”, which can deal with N kinds of soil movement classified by particle size and density. We employed Radiation Stress to consider wind wave force to flow. Calculation results shows that this model can reproduce 3-dimensional soil distribution, and process of seabed being flooded and dried up automatically. In the case considered tide and wind wave, the horizontal velocity becomes stronger, and the change of vertical distribution of soil size changes toward soil surface.

NUMERICAL SIMULATION OF TIDAL CURRENT AND TOPOGRAPHY CHANGE CAUSED BY WAVE AND TIDE