航空レーザー測量データを用いた地形解析による内水浸水想定区域設定手法の開発

概要

論文の詳細を見る
Terrain analysis methods to draw a prediction map of landside waters inundation by using LiDAR DEMs are developed for a municipality to draw it up easily. Several methods, such as an analysis of undulations of square-grid DEMs in settled ranges, an analysis of differences between mean and spot elevations, an analysis by extracting depressions, and an analysis by using topographic wetness index (TWI), that is composed of catchment area and slope, are numerically studied in a target area. And the method is presented to set a ratio of a predicted area to a target area by using the combined method of extracting depressions and TWI that shows the fair agreement with past inundated areas. And the usefulness of the method by extracting lower height original LiDAR data is confirmed.
2012-07-25