Method for measuring and calculating peak flow of drifting debris flow

Abstract

The invention discloses a method for measuring and calculating peak flow of drifting debris flow. The calculation method comprises the following steps of firstly, determining the average length, the average diameter, the total amount, the width of a debris flow channel, the volume ratio of solid substances in debris flow, the total amount of debris flow and the peak flow of debris flow without considering the condition of containing the floating wood, and then calculating the peak flow of the debris flow of the floating wood. The method comprehensively considers main influence factors causingdebris flow peak flow amplification, such as the average length, the average diameter, the total amount and the channel width of the debris flow, of the floating wood in the floating wood debris flow,is scientific in calculation principle, simple in calculation form and easy in parameter acquisition, and adapts to actual engineering design requirements.

Description

technical field [0001] The invention relates to the fields of measurement technology and debris flow prevention and control engineering design, in particular to a method for measuring and calculating the peak flow rate of drift wood debris flow. Background technique [0002] Debris flow is one of the common types of geological disasters in mountainous areas of my country. Its sudden outbreak, fast movement speed and strong destructive power often cause serious harm and threat to infrastructure construction and people's life and property safety. In my country's high-altitude mountainous areas, the vegetation coverage is high. Due to factors such as fires, earthquakes, and landslides in recent years, a large number of tree branches are scattered in the debris flow formation area or piled up in the circulation area. Wood, tilted out with the mud-rock flow, forming drift wood mud-rock flow. [0003] During the movement, the driftwood can be blocked in the narrow part of the chan...

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Problems solved by technology

[0003] During the movement, the driftwood can be blocked in the narrow part of the channel, forming an unstable blockage, which leads to subsequent debris flow deposition. When the deposition reaches a certain level, under the impact of hydrostatic pressure and subsequent debris flow, the driftwood blockage suddenly collapse, the flow increases instantaneously, forming a larger-scale debris flow, which further enhances the impact and destruction ability of the debris flow, causing serious secondary disasters

Due to the influence of driftwood, the flow rate of debris flow has an amplification effect, but there are few studies on the flow amplification effect of debris flow blockage at present. In the design of prevention and control projects for driftwood debris flow, the peak flow rate of debris flow is mostly based on design experience and experience It is based on the formula and does not take into account the important factor of peak flow amplification of debris flow caused by driftwood

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