青藏铁路沿线滑坡泥石流灾害风险分析

Abstract

Abstract: Landslide and debris flow are considered the third nature disasters in the world. Qinghai-Tibet railway is of high risk, so it is very important and necessary to assess the risk of landslide and debris flow disaster accurately and objectively for avoiding harm from disasters. Based on the theory of natural disaster risk research and risk assessment model, selecting 24 landslide and debris flow disasters along the Qinghai-Tibet Railway and historical disaster data, map data, meteorological data and field survey data along the Qinghai-Tibet railway, and by using the method of Multi-risk assessment, this paper established an analysis method for historical risks and potential risk of the landslide and debris flow, built an analysis index system for physical exposure, vulnerability and disaster response capacity based on the data of Qinghai-Tibet railway in 2014, and worked out a comprehensive risk map about landslide and debris flow disasters along Qinghai-Tibet railway. Results show that the high-risk group of landslide and debris flow disasters along Qinghai-Tibet railway has five sections. Therein, in section of Xining-Golmud, Xining-Huangyuan, near the tunnel of Guan-Jiao Mount and Lhasa Valley, the landslides and debris flows risk are the highest; in section of Damxung-Yangbajing, Anduo-Naqu and Tanggula Mount-Hot Springs, the landslides and debris flows risk are in middle level; the landslide and debris flow risk in the rest sections are low, which include three sections as section of HaiYan-Tianjun in Qinghai Lake Basin, Mountain of Xitie-Nanshankou road in Qaidam Basin and Kunlun Pass Qingshui River in Southern Qinghai Plateau. It indicates that the natural disaster risk in Golmud-Lhasa section is greater than that in the west, the landslide and debris flow distribution in west section is concentrated and the threat section is shorter, while the landslide and debris flow distribution is relative dispersed in Golmud-Lhasa section and the threat section is longer. Overall, landslide and debris flow mainly distributed in mountain sections; for the Plateau, basin, wide valley sections, there is almost no landslides and debris flow disasters because of their long thread and wide area. The risk is consistent with the risk causing, indicating that the risk causing is the dominant factor in risk assessment of landslide and debris flow. Besides, judging from the overall distribution, all flat areas are in low-risk areas, showing that terrain is another key factor in risk assessment of landslide and debris flow.

Key words: Qinghai-Tibet railway, landslides and debris flow, risk

CLC Number:

FEI Du-qiu, LIU Feng-gui, ZHOU Qiang, CHEN Qiong, WU Lin. Risk analysis of landslide and debris flow disasters along the Qinghai-Tibet Railway[J]., 2016, 39(2): 345-352.

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Risk analysis of landslide and debris flow disasters along the Qinghai-Tibet Railway

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