Risk Assessment Of Debris Flows And Prevention Countermeasure Study For Section From Luding To Detuo Of Dadu River

Our country has a vast territory and its geological environment condition is complicated. There are almost all types of natural disasters and it is the world's most types of disasters one of the countries. At the same time China's complex terrain conditions, the mountains and plateaus account for more than half the land area, but the undulating mountains, geological structure is complicated, broken rock surface, and as human activities continue to enhance the socio-economic, human and natural resources from over-the environment The continued destruction of natural disasters such as mud-rock flow makes more and more serious. In recent years as the development of people's societal and economic activity, people excessively exploit natural resources and the environment was destroyed continuously. These make debris flow and other natural disasters more and more seriously. As the debris flow is natural and the debris flow also inadequate understanding of the mechanism, to fully control and accurate forecasting landslides occurred there is still a certain difficulties,debris flow on the risk assessment it is particularly important.this causes economic losses of millions dollars by direct and indirect in the mountain area every rainy season. Casualties and the destruction of infrastructure and safety-related incidents have occurred. This has aroused the world concern about debris flow disasters general.This paper analyzes and investigates 17 typical debris flows of geological environment background, including the meteorology and hydrology, the terrain and landform, the formation of lithology, the geologic structure, the earthquake and so on, for the section from Luding to Detuo of Dadu River. On the basis of detailed analyses each debris flow of growth type and spatial distribution, the paper application of the theory of risk assessment and selects Liu Xilin and Tang Chuan who proposed single-ditch landslides risk assessment methods. Carries on the hazard assessment and the vulnerability assessment for each debris flow. combined with hazard assessment and the vulnerability assessment result obtains each debris flow risk assessment result separately finally. Finally, in the risk assessment result's foundation, prevented and controlled two aspects from the rigid prevention and softness, the research analyzes each debris flow prevention engineering measure, the ecology measure, moving measure and warning forecast,warning issued and emergency direction and so on.Based on which, put forward the proposal correspondingly to each debris flow prevention countermeasure, thus achieved the disaster prevention disaster reduction to result in the goal, also supplied the related disaster risk information and all levels of government to provide the relevant information for disaster risk for the life in the debris flow warning area's resident, For the preparation of hedge removal and disaster prevention contingency plans to provide a scientific basis.