Debris flow loose material source activity determining method

Abstract

The invention relates to a debris flow loose material source activity determining method. According to the method, a loose material source is investigated, the geological background condition of the material source of debris flow is determined, and a sampling and testing are performed; the particle characteristic parameters of the loose material source are calculated, an effective particle size, an uneven coefficient and a curvature coefficient are calculated, and a particle characteristic function value is calculated; the topographic parameters of the loose material source are obtained again,the central section of the accumulation body of the loose material source is measured, so that the slope characteristic function of the slope of the accumulation body of the loose material source canbe calculated; and the occurrence state of the material source is calculated, and the movement mode of the material source is judged. The method of the invention has the advantages of mature testingmeans and simple calculation mode. With the method of the invention adopted, the activity degree of the material source in the debris flow in debris flow disaster assessment and exploration can be quickly judged, support can be provided for the accurate assessment of the activity of debris flow disasters, and the accuracy of the assessment of the disasters by disaster prevention workers can be effectively improved.

Description

technical field [0001] The invention belongs to the field of mud-rock flow disaster prevention and control, and in particular relates to a method for judging the activity of loose source of mud-rock flow. Background technique [0002] Debris flow is a typical geological disaster in mountainous areas of my country. Dynamic risk assessment and evolution trend prediction are important issues in the prevention and mitigation of debris flow disasters. Previous studies have shown that the coupling effect of provenance and water body is an important catastrophic process in the formation of debris flow disasters. There are two models for the transformation of loose matter sources into debris flow disasters. One is that loose matter sources enter the ditch and transform into ditch bed matter, which starts to form debris flow under the erosion of channel runoff. The other is that loose matter sources directly recharge Channel fluid forms debris flow. In both models, the initiation o...

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Problems solved by technology

[0003] In the current debris flow disaster evaluation and exploration methods, the source evaluation of debris flow mainly considers topographic parameters, and judges whether the source is active and whether dynamic reserves can be generated according to the deformation signs of the accumulation body. By comparing the slope of the accumulation body and the self-stabilizing slope The difference between them is used to calculate the total dynamic reserves, and the characteristic state of the geological body of the provenance is not coupled and analyzed, so that the calculation method cannot accurately divide the magnitude of its activity, and it is difficult to judge the evolution process of a single provenance

When investigating debris flow disasters and predicting the evolution trend of debris flow disasters, it is difficult to clearly describe the relationship between the characteristics of the provenance and the scale and frequency of disasters, resulting in a discrepancy between the analysis conclusions and the actual characteristics of disaster activities

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