| 冶力关国家地质公园崩滑—碎屑流危险性评价初探 |
| |
| 引用本文： | 施紫越,辛存林,焦志鹏,刘海博,,刘 昕.冶力关国家地质公园崩滑—碎屑流危险性评价初探[J].水土保持研究,2022,29(3):411-418. |
| |
| 作者姓名： | 施紫越 辛存林 焦志鹏 刘海博 刘 昕 |
| |
| 作者单位： | (1.西北师范大学 地理与环境科学学院, 兰州 730070; 2.中国地震局 地震预测研究所, 北京 100036; 3.兰州大学 资源环境学院, 兰州 730000) |
| |
| 摘 要： | “崩滑—碎屑流”是包含有崩塌、滑坡、泥石流的一类特殊运动形式,具有速度快、滑程远、危险性高等特征,确定其分布区域是进行灾害防治的基础。冶力关国家地质公园地处青藏高原东北缘,区内地质环境条件复杂,中小规模崩滑—碎屑流在园区局部呈密集分布。选取11个相关影响因素,借助ArcGIS与maxEnt进行崩滑—碎屑流的危险性评价。结果表明:崩滑—碎屑流主要发育在石炭纪、二叠纪地层中,基岩表面多裸露、破碎,物源类型以风化岩质为主; 极高危险区与高危险区位于研究区的西北部和南部,占总面积的8.71%; maxEnt训练数据集的AUC值为0.982,测试数据集的AUC值为0.964,灾害点密度随危险性等级的升高而增加,与危险性等级的划分原则相符。该研究结果反映了在高寒气候环境下,极低的地表温度与反复冻融的冻胀力不直接诱发崩滑—碎屑流,但昼夜温差与季节性温差可能加速了岩土体的崩解变形与裂隙扩大,同时maxEnt的高精度评价能够为同类型地质公园的灾害治理及其评价提供借鉴。
|
| 关 键 词： | 冶力关 崩滑—碎屑流 高寒区 危险性评价 maxEnt |
Preliminary Analysis on Hazard Risk Assessment on Rockslide-Debris Flow of Yeliguan National Geopark |
| |
| SHI Ziyue,XIN Cunlin,JIAO Zhipeng,LIU Haibo,,LIU Xin.Preliminary Analysis on Hazard Risk Assessment on Rockslide-Debris Flow of Yeliguan National Geopark[J].Research of Soil and Water Conservation,2022,29(3):411-418. |
| |
| Authors: | SHI Ziyue XIN Cunlin JIAO Zhipeng LIU Haibo LIU Xin |
| |
| Institution: | (1.College of Geograghy and Environmental Science, Northwest Normal University, Lanzhou 730070, China; 2.Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China; 3.College of Earth and Environmental Sciences, Lanzhou Universiy, Lanzhou 730000, China) |
| |
| Abstract: | Rockslide-debris flow is a special movement form including collapse, landslide and debris flow, which has the characteristics of high speed, long sliding range and high risk. The identification of its distribution area is the basis of disaster prevention and control. Yeliguan National Geopark is located in the northeast margin of the Qinghai-Tibet Plateau, small and medium-sized rockslide-debris flows densely distributed in the part of the geopark of complex geological environment. Based on the field investigation, 11 influencing factors were selected to assess rockslide-debris flow hazard risk by adopting ArcGIS and maxEnt. The results showed that the rockslide-debris flows mainly developed in the Carboniferous and Permian strata with exposed and broken bedrock surface, the main source of rockslide-debris flow was type of rock; the extremely high-risk area and high-risk area were located in the northwest and south of the study area, accounting for 8.71% of the total area; the AUC values of maxEnt training data set and testing data set were 0.982 and 0.964, respectively, the density of hazard points increased with the ascent of risk grade, which was consistent with the principle of risk grade. The results reflect that rockslide-debris flow was not directly caused by the extremely low surface temperature and the frost heaving force of repeated freezing in the alpine climate environment of the study area, however, the temperature difference between day and night with seasonal temperature difference may accelerate the disintegrating deformation and cracking expansion of rock mass. Meanwhile, high-precision evaluation of maxEnt can objectively provide reference for hazard management and evaluation in similar geoparks. |
| |
| Keywords: | Yeliguan rockslide-debris flow alpine region risk assessment maxEnt |
|
| 点击此处可从《水土保持研究》浏览原始摘要信息 |
| 点击此处可从《水土保持研究》下载免费的PDF全文 |
|
