滑坡侵蚀定量评价模型及应用研究

用信息量方法建立了滑坡侵蚀定量评价模型。其基本步骤为:第一步分析、罗列影响滑坡侵蚀形成的因子,计算各因子所提供的滑坡侵蚀发生的信息量,筛选与滑坡侵蚀关系密切的主要变量;第二步将研究区进行区段划分,计算每一区段各因子信息量的总和,其大小反映了各区段滑坡侵蚀的强烈程度,各区段的集合即为整个研究区的滑坡侵蚀强烈程度——滑坡侵蚀定量评价模型。用建立的定量评价模型对铜川市滑坡侵蚀进行定量评价,将研究区82.5 km2分为:剧烈侵蚀区13.0 km2(占15.76%),强烈侵蚀区20.0 km2(占24.24%),中度侵蚀区25.25 km2(占30.61%),轻度侵蚀区6.0 km2(占总面积的7.27%),微弱侵蚀区18.25 km2(占22.12%)。铜川市滑坡侵蚀中等以上强度区面积58.25 km2,占研究区总面积的70.61%,说明铜川市滑坡侵蚀非常剧烈。

Applied Research on Quantitative Evaluation Model of Landslide Erosion

The information method principle was applied in the mathematical evaluation model of landslide erosion.The first step of it was to analyze the factors affecting landslide process,and determine the main factors by calculating and comparing their contributions to landslide erosion.After section division for the research region,the second step was to summarize the information of selected factors to reflect the degree of landslide erosion on each section,and then set up a quantitative evaluation model for landslide erosion,which was applied for landslide erosion evaluation in Tongchuan City.Results indicated that in the research region of 82.5 km2,the area of highly intensive erosion was 13.0 km2, accounting for 15.76% of the total;the area of intensive erosion was 20.0 km2, accounting for 21.24% of the total;the area of moderate erosion was 25.25 km2,accounting for 30.61% of the total;the area of light erosion was 6.0 km2,accounting for 7.27% of the total;and the area of slight erosion was 18.25 km2,accounting for 22.12% of the total.Thus the area of landslide erosion above middle class was 58.25 km2,accounting for 70.61% of the total area,which implies that landslide erosion in Tongchuan City is serious.