Abstract
As a flood inundation analysis model for urban area, the Building Porosity (BP) model, which approximates the influence of the building by using the porosity and resistance coefficient, is effective. By using this model, it is possible to conduct an accurate inundation simulation even if the floodplains have a huge area. In this study, we focused on the method of setting the porosity, and conducted basic flooding experiments in which building groups have different porosities and layouts. In addition, we carried out the reproduction simulation with two models; the Averaged Building Porosity (BP-A) model which gives uniform distribution of the building porosity and the Localized Building Porosity (BP-L) model which gives local porosity for each calculation meshes. As a result it is clarified that the BP-L model shows higher reproducibility than the BP-A model, and the calculation accuracy with BP-L model greatly depends on the size of calculation mesh in the building group.
