高分解能衛星画像と森林GISを用いた2000年東海豪雨による土砂崩壊の特性分析

概要

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The heavy rainfall from September 11 to 12 in 2000 caused the floods at the plain areas of Tokai district in Japan and sediment failures were induced at the mountain areas. In this study the slope failures and the debris flows at the mountain areas were detected by analyzing the IKONOS pan sharpen fine true color image for the upstream of the Yahagi River. The detection was succeeded for the small failure areas less than 100 m^2 and more than 85 % of the failure sites were exactly detected. It is recognized that the analyzed image is useful as the hazard record map for the sediment failure. Using the hazard record map, forest planning maps and 125 attributes of the forest register of Gifu Prefecture, the forest GIS was developed to analyze the characteristics of the sediment failure in the mountain areas. Relations between the failure zone and the topography, vegetation type, age of trees and so on are clarified by the analysis. The results of the analysis, the hazard record maps and the forest GIS were applied to estimate the risks for the sediment failure in the mountain areas. It is also acknowledged that the application of the hazard record map by the high-resolution satellite image and the GIS for the forest are effective to analyze the characteristics of sediment failure.
2004-08-31