Channel-started debris flow outbreak scale calculation method and application

Abstract

The invention discloses a debris flow outbreak scale calculation method. In view of the shortcoming that the channel-started debris flow outbreak scale calculation method in the prior art needs to be based on long-term debris flow observation data, the invention provides a debris flow outbreak scale calculation method. The core of the method is a debris flow start critical value Cr calculation method expressed by debris flow channel topography, geology, and a hydrological factor, and a debris flow scale calculation method expressed by the critical value Cr. According to the method, the Cr value of a monitored area is firstly used as a monitored value, and when Cr is larger than or equal to 0.35, risk of debris flow occurrence is determined and outbreak scale is further calculated. In optimized condition, the method also uses the rainfall amount of 1h as a common monitored value to determine the risk of debris flow occurrence. The method has a reliable principle, and the threshold calculation more conforms to debris flow forming mechanism; the threshold calculation is not based on long-term observation data, and has better disaster preventing applicability.

Description

technical field [0001] The invention relates to a method for measuring and calculating the scale of a debris flow outbreak, in particular to a method for measuring and calculating the scale of a ditch-starting debris flow outbreak and its application, and belongs to the field of debris flow prevention and control engineering. Background technique [0002] A channel is a steeply sloping water collection channel that is washed by intermittent floods. After the slope runoff is generated, along the slope direction, with the continuous increase of rainfall runoff accumulation, a flash flood with large single-width discharge and flow velocity is formed. Channel erosion refers to the erosion form in which the slope runoff concentrates on the soil and parent rock and cuts into the ground to form a large gully. Loose solids are abundant in the trenches. When the loose solids are tilted or bottomed out due to the influence of climate, environment and hydrology, the debris flow will s...

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Problems solved by technology

Most of these methods have technical defects such as long data collection period, many param

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