A reinvestigation on spatial distribution of shallow landslides induced by the August 1961 and the July 2004 heavy-rainfalls in Izumozaki area, Niigata-GIS analyses using high resolution ortho images and a 2-m DEM-

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  • 新潟県出雲崎地域の１９６１年８月豪雨および２００４年７月豪雨による崩壊地の空間分布の再検討―高解像度オルソ画像と２ｍＤＥＭによるＧＩＳ解析―
  • ニイガタケン イズモザキ チイキ ノ 1961ネン 8ガツ ゴウウ オヨビ 2004ネン 7ガツ ゴウウ ニ ヨル ホウカイチ ノ クウカン ブンプ ノ サイケントウ コウカイゾウド オルソ ガゾウ ト 2mDEM ニ ヨル GIS カイセキ
  • -GIS analyses using high resolution ortho images and a 2-m DEM-
  • -高解像度オルソ画像と2mDEMによるGIS解析-

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Abstract

In this study, we have reinvestigated the spatial distribution of shallow landslides in Izumozaki area, Niigata, caused by the heavy-rainfall in August 1961 and July 2004, by analyses using high resolution ortho images and a 2-m DEM. The results are as follows. The landslides occurred in 1961 are more than twice that in 2004. Among the 2004 landslides, the ratio of the landslides along roads is very high (1961: 4. 2%; 2004: 16. 4%) . More than half of landslides in 2004 (about 70 percent as the number ratio, 54 percent as the area ratio) were primary landslides in a valley side slope not including the 1961 landslides. Primary landslides occurred randomly on outfacing slopes and infacing slopes, if lithological and topographic conditions were the same. Most of the1961 landslides expanded due to the 2004 rainstorm developed on the upper part of slopes. These enlarged landslides tend to occur on slopes with daylighting beds except for the Nishiyama Formations.

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