Development of a Highly Accurate Numerical Simulation Model for River Water Inundation and Landside Water Inundation for Urban Area

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To achieve the various objectives such as flood damage prediction, flood mitigation, river basin development, a highly accurate numerical simulation model, consisting of inundation flow model and sewerage system model, for river water inundation as well as landside water inundation for urban area has been developed. In the inundation flow model, a new solution technique is employed that both river flood flow and river water inundation are solved simultaneously by the highly accurate numerical model for 2D unsteady free surface flows (SA-FUF-2DF model), and such new features as a dry/wet boundary condition for inland topography, a digital surface model (DSM), use of aerial photographic, and geographic information system (GIS) are incorporated as well in order to estimate flood discharge and to reproduce the complex behavior of the inundation flows with high accuracy as well as to achieve the stable calculation and easy data management. In the sewerage system model, the dynamic network model, based on FDS scheme combined with the Preissmann slot, is newly developed to simulate free耀urface and/or pressurized flow flows in a closed conduit, and is testified against experimental data.The model is calibrated against the landside water inundation in Iiduka city (2003) in the Onga river basin, which occurred due to inundation of branches and power deficiency of drainage pump stations. It is also demonstrated from numerical simulations under hypothetical storm intensity pattern in the Onga river basin that the model is a useful tool for achieving the above stated various objectives.