Calculation method and application of river blocking by debris flow

Abstract

The invention discloses a calculation method and application of river blocking by debris flow and belongs to the technical field of debris flow control engineering. The method includes the steps that a confluent angle theta between tributaries and a mainstream is measured; an average width B1 of the mainstream at the confluent with the tributaries is measured, a flow rate Qm of the mainstream is measured, and a discharge Q1 per unit width of the mainstream is determined; an average width B2 of the tributaries at the confluent with the mainstream is measured, and a flow rate Q of debris flow is measured, and a discharge Q2 per unit width of the tributaries is determined, a discharge ratio epsilon per unit width of the tributaries and the mainstream is determined, the depth h of the mainstream at the confluent with the tributaries is measured, a volume factor yt is determined, a yield stress T1 of debris flow is determined, a density Rho of debris flow is determined, and the yield stress factor x of debris flow is determined. The possibility of river blocking by debris flow can be judged according to the value of factory. The calculating model of river blocking by debris flow has the advantages of dimensional homogeneity, high accuracy in calculation and excellent universality. By means of the calculation method and application, river blocking by debris flow can be accurately judged and debris flow control efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow prevention and control engineering, in particular to a calculation method for mud-rock flow blockage of rivers and its application. Background technique [0002] Debris flow refers to the landslides caused by heavy rain, snowstorm or other natural disasters in mountainous areas or other areas with deep valleys and steep terrain, carrying a large amount of sand and stones. Its area, volume, and flow are large, while landslides are small areas of diluted soil mountains. Typical debris flows are composed of viscous mud with coarse solid debris suspended and rich in silt and clay. Under appropriate terrain conditions, a large amount of water soaks the solid accumulations in the flowing water hillside or ditch bed, reducing its stability, and the solid accumulations saturated with water move under their own gravity, forming a debris flow. Debris flow is a disastrous geological phenomenon. Mudsl...

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Problems solved by technology

[0009] The debris flow Huijiang physical simulation test device disclosed in this patent document, although it can simulate the debris flow outbreak and the flow of the river, can study the influence of factors such as different solid sources, slope angles, river water flow rates, debris flow accumulation areas and river intersection angles on the debris flow of the Huijiang River. However, since the field data scale is much larger than the indoor test data, there are large errors in the actual calculation when the dimensions are not harmonious, which affects the accuracy of the judgment of debris flow blocking the river and is not conducive to improving the effectiveness of debris flow prevention and control.

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