GISを利用した山地河川の斜面崩壊要因分析と斜面崩壊危険度マップ作成

抄録

In this paper, various factors such as landform and geological characteristics were analyzed with relevant digital data maps for the slope failures that were caused by heavy rainfall in the event of Typhoon No. 12 in 2011. By using 50 m x 50 m mesh GIS data, a total of 213 slope failures were analyzed by highlighting the hit rate with reference to various factors such as catchment area, slope angle, geology, landslide, terrain curvature and vegetation. A few characteristic features were manifested ; e. g., area at the geological boundary between igneous rock and sedimentary rock shows a high risk of slope failure. Based on the results of the factor analysis, a slope failure risk map was created using GIS data effectively. Using this risk map, the extraction and use of danger areas of disasters including debris flow were verified.