Takahumi SEKI
Case study on landslide hazard estimation of 2004 Fukushima Niigata heavy rain disaster
Satoru OHTSUKAˇˇKoichi ISOBE
A lot of slopes exist in Japan where the mountainous district accounts for about 70 percent of the country. Therefore, the landslide has been frequently generated by the natural damages such as heavy rains and earthquakes in nationwide various places. Especially, a lot of things that the scale is large and damage is extensive are greatly related to the life of the landslide generated by the downpour. It is important for advancing the disaster prevention measures plan and the disaster revival plan in the region in premeditation or more to base the above, and to forecast risk in the region to the disaster overall. The maintenance of the slope damage data by localized torrential rain was advanced in recent years, and a detailed analysis using the geographic information became possible. It is thought that it is very useful to accumulate the struck data obtained from localized torrential rain when such a background is based. Then, various data obtained due to Niigata and Fukushima 7.13 flood damage was maintained with GIS, and the data base was constructed in the present study. Moreover, the correlation of shape and the geological features kind of the influence and land that the rainfall gave to the landslide damage based on the data base was analyzed according to the incidence, and the easiness of damage in the middle mountainous district and the coastal plain by each characteristic to receive was clarified. In addition, a slope landslide risk evaluation model was constructed based on the tendency that had been obtained from the analysis. In the statistical analysis that used the incidence, differing the tendency to the landslide damage that occurred in the ground between Nakayama and the coastal plain became clear
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