| 基于不同评价单元和灾害熵的泥石流危险性分析 |
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| 引用本文： | 李小龙,宋国虎,向灵芝,罗亮,唐良琴,沈娜,梁梦辉.基于不同评价单元和灾害熵的泥石流危险性分析[J].中国地质灾害与防治学报,2021,32(6):107-115. |
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| 作者姓名： | 李小龙 宋国虎 向灵芝 罗亮 唐良琴 沈娜 梁梦辉 |
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| 作者单位： | 1.重庆交通大学山区公路水运交通地质减灾重庆市高校重点实验室，重庆 400074 |
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| 基金项目： | 第二次青藏高原综合科学考察项目（2019QZKK0902）；两相物质组成对泥石流沉积物固结机理及承载特性的影响机制研究（51608083） |
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| 摘 要： | 白龙江流域为泥石流等地质灾害密集分布区。2020年8月由于强降雨激发，白龙江流域武都段发生了大规模的群发性泥石流灾害，造成严重损失。文章以白龙江流域甘肃省陇南市武都段（宕昌县两河口乡—武都区桔柑镇）为研究区，通过野外实地考察，选取流域面积、流域形状系数、平均坡度、沟谷密度、物源参照值（HI）、岩性、流域中心距活动断层距离、一小时最大降雨量、植被覆盖度作为泥石流危险性评价因子。基于灾害熵理论，分别以泥石流单沟和小流域单元作为评价单元，利用ArcGIS软件，进行区域泥石流危险性评价。分析结果表明，研究区内泥石流沟大多数都属于中、高危险性。致灾因子中岩性、物源参照值（HI）、距断层距离、植被覆盖度及平均坡度的权重最大,与实际考察结果一致。且以小流域单元作为评价单元的评价结果更符合研究区的泥石流发育情况。
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| 关 键 词： | 白龙江流域 泥石流 灾害熵 流域单元 危险性 |
| 收稿时间： | 2021-01-25 |
Hazard analysis of debris flows based on different evaluation units and disaster entropy:A case study in Wudu section of the Bailong river basin |
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| Institution: | 1.Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Jiaotong University, Chongqing 400074, China2.Chengdu Hydrogeological Engineering Geological Team of Sichuan Bureau of Geology and Mineral Resources/Geological Engineering Survey Institute of Sichuan Province, Chengdu, Sichuan 610072, China |
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| Abstract: | The Bailong river basin is a densely distributed area of geological disasters such as debris flow. In August 2020, due to the stimulation of heavy rainfall, a large-scale group debris flow disaster occurred in Wudu section of Bailong river basin, causing serious losses. This paper takes the Wudu section (Lianghekou Township, Dangchang County to Jugan Town, Wudu District) of Longnan City in Gansu Province as the research area. Through field investigation, we selected the area of drainage basin, shape coefficient of basin, average slope, density of gully, reference value of material source (HI), lithology, distance between basin center and active fault, one hour maximum rainfall and vegetation coverage as debris flow hazard assessment factors. Taking single gully and small watershed units of debris flow as evaluation units, the regional debris flow hazard assessment is carried out by using ArcGIS software based on the theory of disaster entropy. The results show that most of the debris flows in the study area belong to medium and high hazard debris flow gullies. Some of the most heavily weighted disaster-causing factors like the weight of lithology, source reference value (HI), distance from fault, vegetation coverage and average slope are consistent with the actual investigation results. Moreover, the evaluation results of small watershed units are more consistent with the development of debris flow in the study area. |
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