| 基于分形的巴谢河流域滑坡空间分布格局及其影响因素分析 |
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| 引用本文： | 桂先刚,梁收运,赵红亮,陈卓,张洪伟.基于分形的巴谢河流域滑坡空间分布格局及其影响因素分析[J].西北地震学报,2020,42(1):250-258. |
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| 作者姓名： | 桂先刚 梁收运 赵红亮 陈卓 张洪伟 |
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| 作者单位： | 兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000,兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000,兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000,兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000,兰州大学 西部灾害与环境力学教育部重点实验室, 甘肃 兰州 730000 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）（2014CB744701）；国家自然科学基金（41272326） |
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| 摘 要： | 定量研究区域滑坡空间分布规律，揭示不同类型滑坡的分布格局，对预测和评价滑坡危险性有重要指导意义。基于ArcGIS空间分析功能及分形理论的关联维数和盒计维数，分析了巴谢河流域黄土滑坡及黄土-泥岩滑坡的空间分布格局及其影响因素。结果表明：区域滑坡个体关联具有多尺度分形，黄土滑坡与黄土-泥岩滑坡分别在8 km、12 km尺度上存在阈值，滑坡个体在该阈值尺度前后呈现不同的相关程度，且黄土滑坡个体空间的关联程度和聚集程度均高于黄土-泥岩滑坡；黄土-泥岩滑坡分布范围广、形态复杂，其面积展布盒计维数大于黄土滑坡；地层岩性及坡度对两类滑坡分布格局的影响较大，沟壑密度次之，起伏度影响较小。
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| 关 键 词： | 滑坡 分形分维 空间分布格局 影响因素分析 |
| 收稿时间： | 2018/9/20 0:00:00 |
Spatial Distribution Pattern of Landslides and Its InfluencingFactors in the Baxie River Basin Based on Fractal Theory |
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| GUI Xiangang,LIANG Shouyun,ZHAO Hongliang,CHEN Zhuo and ZHANG Hongwei.Spatial Distribution Pattern of Landslides and Its InfluencingFactors in the Baxie River Basin Based on Fractal Theory[J].Northwestern Seismological Journal,2020,42(1):250-258. |
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| Authors: | GUI Xiangang LIANG Shouyun ZHAO Hongliang CHEN Zhuo and ZHANG Hongwei |
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| Institution: | Key Laboratory of Mechanics on Disaster and Environmental in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, Gansu, China,Key Laboratory of Mechanics on Disaster and Environmental in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, Gansu, China,Key Laboratory of Mechanics on Disaster and Environmental in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, Gansu, China,Key Laboratory of Mechanics on Disaster and Environmental in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, Gansu, China and Key Laboratory of Mechanics on Disaster and Environmental in Western China, Ministry of Education, Lanzhou University, Lanzhou 730000, Gansu, China |
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| Abstract: | Quantitative study of the spatial distribution and revelation of the distribution patterns of different types of landslides are of great significance in predicting and evaluating their risk. Based on the spatial analysis function of ArcGIS and the correlation and box dimensions of fractal theory, spatial distribution patterns and influencing factors in landslides of different types were analyzed. The research showed that:(1) landslides in the Baxie River basin can be divided into 164 loess types with an area of 3.21×106 m2, and 85 loess-mud types with an area of 6.05×106 m2. (2) Individual associations of regional landslides have multi-scale fractals. Loess landslides and loess-mud landslides have thresholds on scales of 8 km and 12 km, respectively. Individual landslides have different degrees of spatial correlation at any scale smaller or larger than the threshold scale, and the degree of spatial correlation and aggregation of loess landslides are always higher than those of loess-mud landslides. Area distribution box dimensions of loess-mud landslides are greater than those of loess landslides, indicating that loess-mud landslides have a wider distribution area and more complex distribution characteristics. (3) Analysis of influencing factors showed that the formation lithology and slope angle exert the biggest influence on the distribution patterns of regional landslides, followed by ravine density. Formation lithology and its combination directly determine landslide type and the complexity of the distribution of the landslide area. Distribution gradients of different types of landslides are not the same. Although the degree of undulation has an important impact on the development of landslides, it has less influence on the quantity and area distribution of both types of landslides. |
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| Keywords: | landslides fractal dimension spatial distribution pattern influencing factors analysis |
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