Study of early warning mechanism of debris flow along railway line in mountainous areas

The paper analyzes the formation mechanism, the movement characteristics and the disaster mode of debris flow. Combine with the formation, movement and the disaster mechanism of the debris flow disaster along the mountain railway line, it considers the four parameters, such as the rainfall of the debris flow area, the rainfall infiltration depth of the source area, the infrasonic information and the ditch mud position as the key parameters of the debris flow disaster early warning in the mountains. Secondly, it establishes the debris flow early warning mechanism along the mountain railway line. According to the scale of itself and the characteristics of debris process, then combine the anti-disaster ability of railway itself, and from the railway safety requirements, it divides the debris flow disaster early warning of mountain railway line into four types, such as the prompt warning, the formation of early warning, the non-disaster early warning and the disaster warning. And establishing the critical value of early warning indicators, the system warning process and the distribution options for the key parameters from the four aspects which containing the drainage area rainfall, the rainfall infiltration depth of the source area, the infrasound and the ditch mud of debris flow. Finally, the paper introduces the test situation in the field of this monitoring and early warning system. Through the field test, it is found that it is feasible of this debris flow disaster warning method along the mountain railway line and it has good application prospects. ©, 2014, Academia Sinica. All right reserved.