Debris flow discharge and volume-weight evolution-with-distance prediction method

Abstract

The invention provides a debris flow discharge and volume-weight evolution-with-distance prediction method. The method comprises that a distributed hydrological model in the physical mechanism divides sub river basins and calculates water power formed by rainfall runoff generation and confluence of the slope-channel system of each sub river basin; the thickness, reserve volume and distribution of movable solid matter under the action of the water power are calculated based on an infinite slope model or a movable solid matter discrimination model; the volume-weight and discharge process of a water and soil mixture formed after power matching of water and soil on the sub river basin outlet are calculated by means of a volume-weight and discharge evolution-with-distance prediction model; according to the grading order and topological relation of the sub river basins, the volume-weight and discharge process of the whole river basin outlet or set section along the river is subjected to back calculation through the volume-weight and discharge process of each sub river basin. According to the invention, subjectivity and nondeterminacy of manual calculation of debris flow discharge and scale through a traditional empirical formula are eliminated, and the debris flow discharge and volume-weight evolution-with-distance prediction method can be widely applied to aspects of debris flow monitoring and early warning, prevention engineering key parameter design, risk analysis and the like.

Description

technical field [0001] The invention relates to the technical field of natural disaster exploration, in particular to a method for predicting changes in debris flow flow and bulk density along the course based on the principle of water and soil dynamics matching. Background technique [0002] Debris flow flow and bulk density are important parameters in debris flow prevention projects and disaster assessment, which determine the scale of debris flow. The process research has always been the difficulty and focus of debris flow and its engineering prevention and control. So far, scholars at home and abroad have conducted research on debris flow from various aspects (Cui Peng et al. 1992; Iverson. 1997; Whipple. 1992; Chen Ningsheng et al. 2001; Tang Bangxing et al. It is considered that the flow of debris flow is formed by the superimposition of the flow of storm flood and the solid phase sediment carried by the basin, and the size of the solid phase sediment flow is directly ...

AI Technical Summary

Problems solved by technology

[0006] Then, the clean water flow Q in the above calculation method P It is calculated according to the hydrological frequency method or the hydrological model; the bulk density of debris flow γ C and blockage coefficient D C It is an empirical value set artificially according to the field investigation and the degree of channel blockage. Different people may take different values. The artificiality is quite large. The fundamental reason is that there is no physical process and mechanism based on debris flow. Therefore, the above method The calculated debris flow flow process and peak flow are also arbitrary and empirical, which differ greatly from the actual situation

Images