広域災害特性分析結果を用いた土砂災害対策支援GISの検討

概要

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Exact and detailed evaluation of the risk for sediment collapse, and counter measures to mitigate sediment disasters in mountain areas caused by heavy rainfall are shown in this paper. At first the characteristics of the sediment disaster in the mountain areas of Gifu Prefecture, Japan due to the 2000 Tokai Heavy Rainfall, are analyzed by using the detailed records for rainfall and sediment collapses, and the database for many features of the forests. Based on the results of the analysis the more exact risks for sediment flow and slope failures are evaluated in the area, and the reliability of the evaluation is confirmed. The practical counter measures for sediment disaster are demonstrated for different phases of the disaster, applying the GIS. Detailed evacuation plans are derived by the real time records of the precipitation and the evaluated risk. To recognize the disasters in the whole area, the sediment collapses map developed with high resolution satellite images, and the GIS data such as roads and houses, are overlaid. In the plan for the dams to mitigate the disaster, the risk analysis is applied to determine the priority for the construction sites.
2006-05-31