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A new two-dimensional numerical solver for a water flow in an estuary with a free water surface and arbitrary curved riverbed is proposed. In the proposed method, a three-dimensional k-e turbulent flow model is averaged in a direction crossing a river and derived two-dimensional equations are solved by applying a CIP-Soroban method. By using the Soroban mesh system, while the physical condition on the surfaces of water body such as “dynamic condition” and “kinematical condition” are easily introduced, computational resolution can be improved effectively by gathering of computational grid points around an arbitral computational area in that the physical value such as salinity changes drastically. The proposed numerical model is applied to a reach of Tone River downstream from an estuary barrage and verification of the proposed method through comparisons with a series of field observation result.

CIP-SOROBAN METHOD FOR TWO-DIMENSIONAL ESTUARY FLOW WITH A RIVER WIDTH AND FREE WATER SURFACE