Risk assessment of high-level collapse and landslide disasters in typical basin-edge mountainous areas in northeast Chongqing: A case study of the Ningqiao area in Wuxi
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摘要:
研究区位于重庆市巫溪县下堡镇内，属渝东盆缘山区，地形切割强烈，地质环境复杂，地质灾害频发。为了研究高陡峡谷区地质灾发育分布规律、风险区划，文章选取高程、坡度、坡向、工程地质岩组、距水系距离及距褶皱距离因子做为地质灾害易发性评价的影响因素，基于ArcGIS平台，利用信息量模型，定量评价了巫溪宁桥片区高陡峡谷区高位地质灾害的易发性，评价模型与地质灾害分布空间契合度较高，评价结果可信度较高。再结合易损性评价对研究区进行了地质灾害风险评价，最终得到研究区地质灾害风险评价模型。为该区域地质灾害防治提供了科学依据，同时对同类高陡峡谷地区地质灾害风险性评价及地质灾害防治具有借鉴意义。
Abstract:The study area is located in Xiabao Town, Wuxi County, Chongqing City. It belongs to the mountainous area on the edge of the Yudong Basin. It has strong topography, complex geological environment and frequent geological disasters. In order to study the development and distribution of geological hazards and risk zoning in high and steep canyons, this paper selects factors such as elevation, slope, aspect, engineering geological rock group, distance from water system, and distance from folds as the influencing factors for the assessment of geological hazard susceptibility, based on ArcGIS The platform uses the information model to quantitatively evaluate the susceptibility of high-level geological hazards in the high and steep gorge area of Wuxi Ningqiao area. The evaluation model has a high degree of correspondence with the distribution of geological hazards, and the evaluation results have a high degree of credibility. Combined with the vulnerability assessment, the geological disaster risk assessment of the study area was carried out, and finally the geological disaster risk assessment model of the study area was obtained. It provides a scientific basis for the prevention and control of geological disasters in the region, and at the same time has reference significance for the risk assessment of geological disasters and the prevention and control of geological disasters in similar high and steep canyons..
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Key words:
- Wuxi /
- geodisaster /
- information model /
- risk assessment
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表 1 各因子二级划分信息量值表
Table 1. Information values of factor classifications
影响因子 因子分级 分级面积/km2 地灾面积/km2 滑坡信息量 高程/m <400 2.45 0.08 −0.17 400～500 3.71 0.15 0.02 500～600 4.00 0.21 0.27 600～700 3.63 0.11 −0.30 700～800 3.59 0.09 −0.44 800～900 3.10 0.16 0.24 900～1000 2.17 0.10 0.16 1000～1100 1.30 0.06 0.22 1100～1200 0.64 0.02 −0.11 1200～1300 0.16 0.00 −1.32 >1300 0.07 0.00 − 坡度/（°） 0～10 1.02 0.02 −0.52 10～20 1.66 0.08 0.20 20～30 4.61 0.19 0.03 30～40 7.98 0.22 −0.38 40～50 6.29 0.19 −0.27 50～60 2.33 0.17 0.60 60～70 0.72 0.09 1.19 70～80 0.21 0.02 1.00 80～87.4 0.01 0.00 0.71 坡向 N 5.16 0.07 −1.04 NE 3.66 0.06 −0.85 E 2.34 0.03 −1.19 ES 2.33 0.06 −0.43 S 4.49 0.45 0.92 SW 2.67 0.23 0.78 W 1.61 0.05 −0.24 WN 2.57 0.03 −1.17 距河流距离/km 0～0.1 7.42 0.15 −0.67 0.1～0.2 5.71 0.19 −0.16 0.2～0.3 3.99 0.22 0.33 0.3～0.4 2.84 0.22 0.67 0.4～0.5 1.86 0.11 0.38 0.5～0.6 1.04 0.02 −0.51 0.6～0.7 0.71 0.01 −1.21 0.7～0.8 0.48 0.01 −0.64 0.8～0.9 0.30 0.03 0.78 0.9～1.0 0.23 0.01 0.20 1.0～1.1 0.15 0.01 0.81 1.1～1.2 0.06 0.00 −3.89 1.2～1.3 0.03 0.00 − 1.3～1.4 0.00 0.00 − 工程地质岩组 Ⅰ1 0.08 0.00 − Ⅰ2 0.70 0.02 −0.31 Ⅱ1 11.73 0.31 −0.40 Ⅱ2 0.00 0.00 − Ⅱ3 0.00 0.00 − Ⅲ1 0.00 0.00 − Ⅲ2 11.00 0.59 0.29 Ⅲ3 0.89 0.06 0.55 Ⅳ1 0.00 0.00 − Ⅳ2 0.10 0.01 0.28 距褶皱距离/km 0～0.1 0.00 0.00 − 0.1～0.2 7.39 0.28 −0.07 0.2～0.3 3.52 0.15 0.09 0.3～0.4 3.33 0.11 −0.23 0.4～0.5 3.05 0.11 −0.13 0.5～0.6 2.61 0.15 0.38 0.6～0.7 1.95 0.12 0.47 0.7～0.8 1.37 0.06 0.15 0.8～0.9 0.72 0.01 −1.44 0.9～1.0 0.29 0.00 −2.79 1.0～1.1 0.23 0.00 − 1.1～1.2 0.19 0.00 − 1.2～1.3 0.10 0.00 − 1.3～1.4 0.04 0.00 − 1.4～1.5 0.00 0.00 − 
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表 2 研究区地质灾害易发性分级统计
Table 2. Statistics analysis result of susceptibility classes
易发性分区 分区面积/km2 占比% 地灾点面积/km2 占比% 低易发区 1.96 8.02 0.00 0.17 中易发区 8.73 35.69 0.08 7.83 高易发区 9.15 37.41 0.29 28.96 极高易发区 4.61 18.86 0.62 62.75 高、极高易发性 13.77 56.28 0.91 91.71
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表 3 研究区地质灾害风险分级统计
Table 3. Statistics analysis result of risk classes
风险分区 分区面积/km2 百分比% 地灾点面积/km2 百分比% 低风险区 3.39 13.86 0.01 0.72 中风险区 15.48 63.31 0.33 33.56 高风险区 5.32 21.74 0.63 63.74 极高风险区 0.26 1.08 0.02 1.69 中及以上风险性 21.07 86.13 0.98 98.99
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