Abstract
The floodplain 2D MODEL with Cartesian grid cannot express urban structure (e.g. the road and river etc.) in detail for overland flood flow analysis. Recently, overland flood flow analysis with unstructured grid is proposed and applied to various simulations for water disaster. The aim of this study is to develop the overland flood flow analysis model using unstructured grid and to evaluate the characteristics of the results obtained by the model. Though the analysis model is based on Kawaike et al model, the flux correction considered with shapes of grid side is newly proposed for the calculation of flux at the center point of grid. From the comparative analysis of Cartesian grid and unstructured grid, the validity of the model with unstructured grid is evaluated. By application of this model to an urban area, it is shown that the calculated inundated water flows on the road and spread out. The behavior of flood flow in urban area is successfully simulated.
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