Evalution of shallow loess landslide stability in typical loess hilly region: A case study of Zhidan County in Yan'an area of Shaanxi Province
Yang Wenlu1,2, Qiu Haijun1,2,3, Pei Yanqian1,2, Hu Sheng1,2,3, Cao Mingming1
1. College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, Shaanxi;
2. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, Xi'an 710127, Shaanxi;
3. Institute of Earth Surface System and Hazards, Northwest University, Xi'an 710127, Shaanxi
The geological environment of the loess hilly region is fragile, and it is easy to induce shallow loess landslides during the rainy season. Zhidan County is a typical loess hilly region, where the loess landslide is widely distributed and the shallow loess landslides account for 85% of the total number of landslides. The research area is located in Zhidan County of Shaanxi Province, where the geological environment condition is poor and shallow landslides account for 80% of the total landslides. Evaluation of shallow landslides stability is not only conductive to understand the occurrence and development of shallow landslide, but also of great significance for disaster prevention and regional planning. In this paper, 96 shallow landslides were acquired through field investigation, aerial survey by UAVs and interpretation by satellite image. The basic physical and mechanical parameters were obtained through laboratory experiments. The SINMAP model was used to evaluate the stability of shallow landslide under different rainfall conditions in the study area. Then the area of stability regions, the number of landslide points and landslide density under different rainfall levels were analyzed. The simulation results of SINMAP model show that the overall stability of the study area is relatively high. When the precipitation value is 8.6 mm, 15 mm, 25 mm, 50 mm and 100 mm, the area falling in instable classes (including high instable, instable and potentially instable)accounts for 9.12%, 18.93%, 23.17%, 30.94% and 38.67% of the total area respectively, and the unstable area does not exceed half of the area of the watershed. The landslide density of the high instable class is the largest, followed by the instable and potential instable class. The areas expand in instable classes with the increase of precipitation values, and the areas in high instable classes located in the place with steep slope and intensive fluvial erosion has a small change in area. The stability of shallow landslide depends a great extent on the local topography conditions:the elevation is between 1302~1606 m, the slope is between 20°~51°, and the largest number of shallow landslides is in the westward and northwest slope. Finally, the stability simulation results by SINMAP model is verified through landslide field investigation. SINMAP model provides a powerful tool to predict the stability of rainfall induced shallow loess landslides. It not only evaluates the stability of existing landslide, but also predicts the potential landslide in the future under different rainfall conditions, which will be helpful to prevent and mitigate the loss caused by landslide disaster and provide reference for reasonable urban planning and road siting.
杨文璐, 邱海军, 裴艳茜, 胡胜, 曹明明. 典型黄土丘陵区浅层黄土滑坡稳定性评价——以延安市志丹县为例[J]. 第四纪研究, 2019, 39(2): 408-419.
Yang Wenlu, Qiu Haijun, Pei Yanqian, Hu Sheng, Cao Mingming. Evalution of shallow loess landslide stability in typical loess hilly region: A case study of Zhidan County in Yan'an area of Shaanxi Province. Quaternary Sciences, 2019, 39(2): 408-419.
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2019, Vol. 39 
