Area classification of micro-landform and hazard maps relating to landslide disaster

Abstract

After the landslide disasters in Hiroshima City in 2014, I confirmed the necessity to display landform information of the micro-landform or the watershed, and to overlay regional disaster prevention units on the hazard map. Based on this confirmation, four concepts from the view-point of Quaternary research and creating a hazard map for landslide disasters were summarized in the case study area including the volcanic fan of Mount Unzen. The history of landform development with landform processes, such as deposition and erosion within a period of the order of 10 2 years, can be used as a basic material for area classification to landslide disasters. Spatial analysis consisting of interpreting of elevation changes as landform process and over-laying the results from the oldest to the youngest means the construction of landform development. Spatial analysis, reclassifying the geographic information interpreted as a set of landform processes including its type, size, and sequence means the classification of micro-landforms. From the results of landform analysis using DEM on the volcanic slope, it is easy to understand the area safety based on micro-landforms and the area in which to be aware of debris and water movement from watersheds.