Abstract
The urbanized areas in Japan have been subjected to the danger of inundation due to these location of the alluvial lowlands formed by flooding. Further, in recent years, the inundated areas have been increased by the rapid urbanization, in spite of the fact that the drainage system has been completely equipped for the established design level. In this paper, flooding model for urbanized area is proposed when the flood will exceed a design level. To put it concretely, Two-dimensional and One-dimensional approach are presented to analyze for the complicated flow condition mixing the sub-critical flow and the super-critical flow. The applicability of these models is explained by numerical study.
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