Hazard assessment of landslides in Lancang County, Yunnan Province based on weighted information value model
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摘要:
云南澜沧县位于滇西经向构造带中，在构造运动强烈，人类活动日益增加背景下，滑坡灾害发育，人民生命财产受到严重威胁，因此，对该区域进行滑坡危险性评价研究具有重要意义。以澜沧县滑坡数据为基础，选取高程、坡度、坡向、地层岩性、距断层距离、植被覆盖度、距道路距离、降雨量共8个评价因子，构建滑坡危险性评价指标体系。基于熵权法与信息量耦合模型，利用ArcGIS地理空间分析对研究区滑坡危险进行定性、定量评价并分区。结果显示：高危险区面积占17.91%，较高危险区占37.91%，中危险区占25.94%，低危险区占18.25%。经检验评价结果合理，加权信息量模型适用于滑坡危险性评价。
Abstract:Lancang County is located in the longitudinal tectonic zone of western Yunnan, where landslides are frequently developed by strong tectonic movement and increasing human activities, thus posing a significant threat to the safety and security of the local population. Therefore, it is of great significance to assess the landslide risk in this area. To construct a landslide risk evaluation index system, data on previous landslides in Lancang County was analyzed, and eight control factors were selected, including elevation, slope, slope direction, stratigraphic lithology, distance from fault, vegetation coverage, distance from road and rainfall. By using the entropy weight method and information coupling value model, the landslide risk in the study area was qualitatively and quantitatively evaluated, and ArcGIS geospatial analysis was used to partition the results. According to the assessment, high-risk areas accounted for 17.91% of the total area, relatively high-risk areas accounted for 37.91%, moderate-risk areas accounted for 25.94%, and low-risk areas accounted for 18.25%.The evaluation results were deemed reasonable, and the entropy weight method and information coupling value model were found to be appropriate for landslide hazard assessment in the region.
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Key words:
- landslide /
- entropy weight method /
- information volume model /
- risk assessment /
- Lancang County
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表 1 数据来源
Table 1. Summary of data source
数据名称 数据来源 数据名称 数据来源 滑坡灾害点 澜沧县地质灾害详查 DEM数据 地理空间数据云 地质图 全国地质资料馆 降雨量 中国气象数据网 道路数据 91卫图助手 植被覆盖数据 地理空间数据云 
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表 2 指标统计计算结果
Table 2. Statistical calculation results of indicators
因子 因子二级属性 滑坡点个数 栅格数量 信息量 相对点密度 归一化Xi Hi Wi 高程/m 492～1 099 20 1 224 511 −0.076 0.927 0.196 0.921 0.174 1 099～1 366 33 2 536 591 −0.303 0.738 0.156 1 366～1 623 54 2 684 074 0.133 1.142 0.241 1 623～1 910 58 1 991 079 0.503 1.653 0.350 1 910～2 530 6 1 268 180 −1.315 0.269 0.057 坡度/（°） 0～10 24 1 453 076 −0.065 0.937 0.171 0.984 0.034 10～20 75 3 730 552 0.132 1.141 0.208 20～30 47 3 223 642 −0.189 0.827 0.151 30～40 20 1 114 820 0.018 1.018 0.186 >40 5 182 345 0.442 1.556 0.284 坡向 北 18 1 267 813 −0.216 0.806 0.102 0.967 0.072 东北 38 1 404 853 0.429 1.535 0.195 东 9 1 199 159 −0.853 0.426 0.054 东南 14 1 116 898 −0.341 0.711 0.090 南 29 1 195 808 0.319 1.376 0.175 西南 25 1 283 120 0.101 1.106 0.140 西 14 1 112 242 −0.336 0.714 0.091 西北 24 1 124 542 0.192 1.211 0.154 地层岩性 松散岩（土）体 3 91 136 0.625 1.868 0.306 0.911 0.197 软弱岩层 7 197 943 0.697 2.007 0.329 较软弱岩层 30 2 174 744 −0.245 0.783 0.128 较坚硬岩层 128 6 776 327 0.070 1.072 0.176 坚硬岩层 3 464 285 −1.003 0.367 0.060 距断裂距离/m 0～1 000 44 1 912 260 0.267 1.306 0.282 0.971 0.065 1 000～2 000 29 1574 153 0.044 1.046 0.226 2 000～3 000 16 1 187 454 −0.268 0.765 0.165 3 000～4 000 8 917 368 −0.703 0.495 0.107 >4 000 74 4 113 200 0.021 1.021 0.220 植被覆盖度 0～0.19 33 900 995 0.732 2.079 0.329 0.897 0.228 0.19～0.45 45 1 291 011 0.682 1.978 0.313 0.45～0.66 38 1 846 666 0.155 1.168 0.185 0.66～0.84 41 2 895 125 −0.219 0.804 0.127 0.84～0.1 14 2 770 638 −1.249 0.287 0.045 距道路距离/m 0～500 19 480 354 0.809 2.245 0.358 0.950 0.111 500～1 000 11 458 280 0.309 1.362 0.217 1 000～1 500 7 433 124 −0.086 0.917 0.146 1 500～2 000 6 413 798 −0.195 0.823 0.131 >2 000 128 7 918 879 −0.086 0.917 0.146 降雨量/mm 1 212.3～1 313.2 41 1 166 233 0.691 1.995 0.356 0.947 0.119 1 313.2～1 382.0 35 1 524 128 0.265 1.303 0.233 1 382.0～1 435.2 27 1 962 908 −0.248 0.781 0.139 1 435.2～1 485.8 38 2 637 049 −0.201 0.818 0.146 1 485.8～1 545.5 30 2 414 117 −0.349 0.705 0.126
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表 3 分区统计结果
Table 3. Statistical results of zoning
危险性等级 面积/km2 面积
比例/%滑坡点
/个滑坡点
比例/%滑坡相对
点密度高危险区 1549.72 17.91 84 49.12 2.74 较高危险区 3280.77 37.91 63 36.84 0.97 中危险区 2244.93 25.94 19 11.11 0.43 低危险区 1579.76 18.25 5 2.92 0.16
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