数値地形モデルに基づく地震時山腹崩壊斜面の地形解析
1997 年 49 巻 6 号 p. 9-16
詳細
1997 年 49 巻 6 号 p. 9-16
Landslides during an earthquake often occur at peculiar topography, that is, steep and convex slopes. We examined these features by two parameters using digital terrain models of actual mountain slopes which had suffered from earthquake-induced landslides. These parameters, one is slope gradient and the other is mean curvature, worked well distinguishing those landslide slopes among all slopes. Especially when these parameters were derived on particular node distances, they had significant effects. These special node distances should reflect dominant scales of principal mechanisms or factors of initiation of the landslides. The dominant scales were lOm for gradient and 50m for curvature. Using these results, we developed an evaluation method concerning the susceptibility of slopes to earthquake landslides.
