Debris flow volume weight calculation method

Abstract

The invention is suitable for the technical field of debris flow prevention and control engineering, and provides a debris flow volume-weight calculation method. The calculation method comprises the following steps: acquiring an orthoimage of a debris flow accumulation area; performing grid division on the orthoimage, and identifying a block stone boundary and a slurry boundary; counting the total area A1 of the block stones and the total area B1 of the slurry according to the boundaries of the block stones and the slurry; and weighting and calculating the volume weight gamma of the debris flow by taking the block stone and the slurry area as weight factors. According to the calculation method provided by the invention, the unmanned aerial vehicle is adopted to shoot the orthoimage of the debris flow accumulation area at the first time after the disaster, on-site original data is quickly obtained, the obtained data is high in accuracy, the calculation method is simple, the range is large, and the true value of the volume weight of the debris flow can be better reflected.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow prevention engineering, in particular to a method for calculating the bulk density of mud-rock flow. Background technique [0002] In mountainous areas, debris flow disasters occur frequently and cause a large number of casualties and property losses. Especially in the mountainous areas of western China, the loose sources caused by earthquakes will cause disasters every year under the induction of heavy rainfall. In the design process of debris flow prevention and control engineering, the bulk density of debris flow is one of the most important parameters of debris flow, which has a great influence on the velocity of debris flow, the calculation of the impact resistance of the retaining dam, and the wear resistance of the drainage channel. [0003] The traditional methods for calculating the bulk density of debris flow include on-site mixing method, weighing method, indoor particle analysis...

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Problems solved by technology

[0005] However, the above methods are all based on statistical regression analysis methods, and the original statistical data are obtained through traditional on-site mixing methods, weighing methods, and characteristic parameter methods. There are still defects such as difficulty in obtaining original data, low precision, inaccurate calculation results, and inability to reflect the true value of debris flow bulk density.

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