A Calculation Method for Threshold Value of Initiating Flow Depth of Debris Flow Channel Deposits in Earthquake Area

Abstract

The invention discloses a method for calculating a starting flow depth threshold of earthquake region debris flow channel debris. The method comprises the following steps: obtaining a channel gradient alpha and a channel longitudinal river slope j of an earthquake region debris flow channel, an inner friction angle theta of channel debris, a debris flow viscosity coefficient eta, a debris flow unit weight gamma, a unit weight gamma W of water in the debris flow, a saturated unit weight gamma sat of channel debris; substituting the obtained parameters in a computational formula to obtain the threshold of the predicted debris flow depth in a debris flow starting process. The method is suitable for predicting the flow depth when the earthquake region debris flow channel debris starts to move, compared with the prior art, the method has the advantages that the starting flow depth of the earthquake region debris flow can be obtained more accurately obtained strict theoretical derivation so as to provide reference for the prediction of the earthquake region debris flow, the operation is simple and efficient, and the demands of preventing geological disasters can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of mud-rock flow early warning, and in particular relates to a calculation method for the threshold value of the starting flow depth of debris flow channel deposits in an earthquake zone. Background technique [0002] After the "5.12" earthquake, a large number of earthquake secondary disasters were induced in the strong earthquake area, among which debris flow events of different scales broke out in the strong earthquake area every year, which brought serious personal injuries and huge economic losses to the strong earthquake area , and the active period of geological hazards in strong earthquake areas will last for 20 years after the earthquake. The early warning of debris flow is one of the main methods of prevention and control of debris flow. The existing early warning of debris flow is mainly based on the rainfall conditions of the debris flow basin and the depth of mountain torrents, and the main meth...

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of rainfall intensity, there is a certain error in the early warning of debris flow. Compared with areas with less rainfall data, the early warning of debris flow based on rainfall intensity is risky and cannot be efficiently and conveniently extended to design units and production units.

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