Research On Evaluation Method And Application Of The Susceptibility Of Glacial Debris Flow

Glacial debris flow is a special geological disaster.Its causes are different from the general rainfall debris flow.The damage caused is more serious than the rainfall debris flow.It has attracted the attention of the government,experts and scholars.The glacial debris flow in my country is widely distributed.Among them,the China-Pakistan Highway is a typical subcontinental glacial debris flow area in my country.The natural conditions of the place where it passes through are harsh,and the frequent debris flow has become the biggest obstacle to the normal passage of the China-Pakistan Highway.This paper takes the glacier debris flow along the China-Pakistan Highway as the research object.Based on historical data collection,remote sensing interpretation and field investigation,the formation conditions of the glacier debris flow are analyzed,and the evaluation index system of glacial debris flow susceptibility is established,based on the entropy weight method and fuzzy synthesis.The judging method evaluates the susceptibility of the glacial debris flow on the China-Pakistan Highway.The main results of the thesis are as follows:(1)Collect the geological environment,meteorology and remote sensing image data of the China-Pakistan Highway(China Section),and grasp the development background of the debris flow of the China-Pakistan Highway.(2)Divide the sub-basins along the China-Brazil Highway through SWAT software and remote sensing images;analyze the formation mechanism of China-Brazil glacier debris and analyze its distribution characteristics from the perspective of time and space through regional data processing,from the scale of debris flow,topography and formation of debris flow Analyze its developmental characteristics by zoning and so on.(3)According to the disaster-generating environment and debris flow disaster characteristics of the China-Pakistan Highway,the conditions for the formation of glacial debris flow are analyzed in detail in terms of topography,water source and provenance conditions.Among them,the difference between the formation conditions of glacier-type debris flow and rainfall-type debris flow is highlighted,namely the influence of temperature and moraine.From this,8 evaluation indicators were selected,including the basin area,relative height difference,slope,main ditch longitudinal drop,average temperature in July,maximum daily rainfall,ice and snow coefficient,and moraine,and established evaluation indicators for the susceptibility of glacial debris flow.system.(4)According to the evaluation index system of glacial debris flow susceptibility,taking the basin as the evaluation unit,based on the entropy weight method and fuzzy comprehensive evaluation method,the susceptibility of the glacial debris flow of the China-Brazil Highway is evaluated,and finally the susceptibility of the glacial debris flow of the China-Brazil Highway is obtained.The evaluation results are: 33 are extremely prone to occur,20 are moderately prone to occur,28 are lightly prone to occur,and 4 are not prone to glacial debris flow basins..