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|關鍵字:||崩塌;Landslide;九大坡形;坡形分類技術;Nine slope shapes;Slope shape distinguishing technique||出版社:||臺中巿： 國立中興大學農學院||Project:||農林學報, Volume 60, Issue 4, Page(s) 275-292.||摘要:||
The concept of nine slope shapes was used on comparing digital elevation model (DEM) with slope shapes, and distinguishing pre-landslide terrain in landslide areas which were triggered by Chi-Chi earthquake and Typhoon Morakot in this study. Statistics for nine types of slope shape classification were discussed for the relationships between slope shapes and landslide potential. Slope shape can probably affect the susceptibility of a slope to landslide, and can be regarded as one of landslide characteristics. In this research, the digital elevation models of nine-unit slope shape were established to match with pre-landslide terrain and distinguish slope shape classification. This slope shape matching technique showed the representative slope shape of a complete landslide area, not that single grid cell. The technique was applied to compare DEM and distinguish pre-landslide terrain of Chi-Chi earthquake and Typhoon Morakot. The results were that convex-concave slope shape in Chi-Chi earthquake has the largest proportion (25.25%), and was found on the ridge, the top of hill or the edge of cliff. Linear-concave slope shape in Typhoon Morakot has the largest proportion (30.25%), usually located in the lower section of a profile where existing the convergence of percolated water. Furthermore, statistical tests were discussed with nine slope shapes and landslide area, slope, aspect, elevation by analysis of variance and post-hoc analysis with 5% significance level. These indicated that nine slope shapes of pre-landslide are statistically significant and correlation of spatial distribution to landslide area, slope, aspect, elevation. Therefore, it is necessary to distinguish the slope shapes for discussing the characteristics of landslide.
|Appears in Collections:||第60卷 第04期|
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