关键词: 滑坡, 变维分形理论, 孕灾环境因子, 敏感性分析, 分维值, 分维值方差, 四川普格县

Abstract: The west of Sichuan Proince is highly prone to geological disasters.In an attempt to quantify the sensitivityof landslide-brewing environmental factors (including fault, petrofabric, river, slope gradient, land relief, road, and elevation),the discrete degree of fractal dimension values of the abovementioned factors are measured by calculating the variance of fractal dimension values in association with ArcGIS. Landslide in Puge County of Sichuan Province are taken as research objective. The main results are concluded as follows:(1)Slope gradient, fault, and road have large impact on the development of landslide, while river and land relief has small influence on landslide development; (2) The variance of fractal dimension value of medium-sized landslide is the largest, followed by that of small landslide and large-scale landslide; (3) The sensitivity of landslide to hazard-brewing factors can be quantified by fractal dimension values, and the dicrete degree of the sensitivity can be measured by variance of fractal dimension values; (4)The variable dimension fractal theory provide a basis for obtaining the weights of hazard-brewing environmental factors in landslide risk assessment.

Key words: landslides, fractal dimension theory, hazard-brewing environmental factors, sensitivity analysis, fractal dimension value, variance of fractal dimension value, Puge County