INUNDATION ANALYSIS OF THE USHIZU RIVER BASIN USING TOPOGRAPHIC INFORMATION OBTAINED FROM AERIAL TRIANGULATION

Abstract

An aerial triangulation is applied to obtain very fine orthoimages and DEMs of the Ushizu River Basin. This information is hardly ever obtained by other measures. In this study, using the obtained topographic information by the aerial triangulation, a 2-D depth-averaged computational simulation of the overland flow is executed. Calculated results suggest the places where the inundation disasters had occurred frequently. It has been found the measure to obtain the topographic information by the digital photogrammetry functions effectively in the lowland.