Study On Risk Assessment Method Of Single Gully Debris Flow Based On RS And

This paper researches on the risk evaluation method of single ditch debris flow on the base of Remote Sensing(RS) and GIS information extraction technology. On the basis of previous studies, the author had a theoretical research of innovation to the risk evaluation method of single ditch debris flow. It’s considered that risk is the product of hazard and vulnerability according to traditional research. This paper argues that the risk evaluation of single ditch debris flow should be an evaluation on the economic damage or losses, or namely risks, on the bases of hazard of the debris flow of different frequency and damage extent of the hazard-bearing body, and consider prevention and cure project into risk evaluation. Thus the risk evaluation of single ditch debris flow, should firstly evaluate the hazard under different frequency of occurrence, then evaluate the damage losses rate of hazard-bearing body under different intensity of the debris flow. Research methods such as RSare used as data obtaining means, while GISis used as the information extraction tool. The author extracts parameters from the DEM data with GIS technology, and establishesa mathematical model to simulate the dynamic process of debris flow accumulation in Matlab with the numerical simulation method, then puts the results into GIS to rank risk classification based on different frequencies.Under the theoretical thought of established risk evaluation, the author determines the method and model to evaluate the hazard, and the method and model to evaluate the damage. This paper sets the disaster of debris flow of Sanyanyu in Zhouqu as a living example, in terms of numericalsimulation as a result of the hazard, putting forward theconcept of damage loss rate and its calculation method, and then uses these information to evaluate the benefit of the debris flow directly. We also will discuss the benefits after disaster control and mitigation prevention project, which can bring different effects to the final result of risk assessment..