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Tidal flats are important for the ecosystem in estuaries. Some researches using three-dimensional flow (hereafter 3D flow) and water quality model are conducted, but treatment of tidal flats is neglected because it is difficult to use a scheme for the flow of tidal flats in 3D flow analysis. In this paper, a scheme for the dry-to-wet and wet-to-dry dynamics of the tidal flat is applied to three idealized topographies and the Ariake Sea. This shceme represents the movement of shoreline very well. In the flow analysis of the Ariake Sea, three topographies are used: A) the tidal flat is treated as it is by the contribution of the scheme, B) it is changed to the water area with a certain water depth, C) it is reclaimed to be excluded from the computation area. The analysis with third one does not have good results because flow becomes weak. The result of the analyses with the first and second one represents the observed results very well. The 3D flow model with the dry-wet scheme works well in the flow simulation and becomes foundations of the 3D flow and water quality model for the tidal flats.

DEVELOPMENT OF 3D FLOW MODEL FOR TIDAL FLAT AND APPLICATUON OF THE MODEL TO THE ARIAKE SEA