采用本底因子贡献率法的三峡库区滑坡危险度区划

Bottom Factors Applied to the Zoning Study of the Risk Levels of Landslides in Three Gorges Reservoir Area

在不考虑触发因素的情况下对滑坡本底因子定量化处理,分析与滑坡发育的关系,进行滑坡本底因子危险度区划。采集参加区划的本底因子包括地层岩性(U_1)、坡度(U_2)、坡形(U_3)、高差(U_4)、坡向(U_5)共五种。通过危险度区划,研究区约4650 km^2中,极高危险度区57．44 km^2,高危险度区2 305．15 km^2,中危险度区1241．6 km^2,低危险度区1045．31 km^2。采用的方法：①数据库反演统计；②贡献率与权重分析；③危险度模糊判别。

Without taking inducing factors into consideration, this paper adopts a quantitative analysis of the bottom factors in the Three Gorges Reservoir area, studies the relationship between the bottom factors and the development of landslides, and then zones the area according to risk levels. The bottom factors adopted in this paper include lithological characters（ U1 ）, gradient（ U2 ）, slope form（ U3 ）, difference of height（U4）, and slope orientation（ U5 ）. In 4 650 km^2of the studied area, the areas of the very high, high, medium and low hazard degree area respectively were 57.94 km^2, 2 305.15 km^2, 1 241.6 km^2, 1 045.31 km^2. The methodological steps are①inversion statistic analysis,②the analysis of contribution ratio and weighing,③getting results via fuzzy evaluation of risk levels.