Integrated Modeling for Inundation Flows in Urban Areas

This study proposes an integrated physically based distributed model for inundation flows. It has four sub-models: a hydrological model for rainfall-runoff, a two dimensional shallow water model for overland flows, a one dimensional model for flows in sewer networks, and a data management model. The 2-D shallow water model is at first tested against the physical experiments about the inundation due to levee breach. Then the model is applied to the inundation caused by the extreme tidal surge in Takamatsu city, a local capital in Japan in 2004. Comparisons with measured data show that the model reasonably describes the inundation process in the urban area and that the sewer network played an important role in draining the sea water.