Abstract
A numerical simulation in estuary including a tidal flat is carried out with the Movable Land-Sea Boundary Method that land boundary changes according to the ebb and flood. We developed a new method controlling two problems, namely, conservation of water mass, tidal curve on shallow water area. By comparison of other two methods, our present method controlled about 1-10% as to conservation of water mass. And tidal curve was expressed naturally without any impact of numerical treatment. Then, we carried out a tidal current simulation for evaluation of flow field in Sanbanze. In Sanbanze, there are some passage that is 5-12m depths and some emergence areas in spring tide. The topography condition is very complicated. Simulation results agreed with current direction in each tidal cycle and the locations of emergence areas. However, the scale of emergence areas was larger a little than observation data, since computational grid was large compared with a spatial scale of the tidal flat. From the above examination, application to the tidal flat of our present method was confirmed.
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