Self-adaptive cofferdam lake gradual collapse coupling prediction model

Abstract

The invention relates to a self-adaptive cofferdam lake gradual collapse coupling prediction model which is characterized by comprising the following steps: fitting a cofferdam lake water level-reservoir capacity curve to obtain the total water volume W0 of a reservoir area before dam collapse; deciding a breach width bm and a breach depth hm; calculating a dam break maximum flow of the dam site section to obtain the reservoir capacity Wm corresponding to the break depth hm; calculating the average volume sand content percentage p; calculating the maximum water depth ratio [beta]m of the dam break position; calculating an expansion duration tau; calculating a real-time dam break flow process q(t), and calculating a drainage amount W(tau); checking whether the product is in an acceptable range; calculating duration T after the dam break flood peak; deducing a post-peak flow process; calculating the residual water quantity W(T) in front of the dam; checking whether the product is in an acceptable range; and integrating the obtained pre-peak and post-peak flow processes q(t). According to the method, the possible maximum flood peak flow can be obtained, the dam break flood process can be deduced together, the dam break flood flow process can be quickly obtained, and a reference is provided for front-line emergency rescue treatment.

Description

technical field [0001] The invention belongs to the interdisciplinary fields of hydrology and hydraulics calculation, and in particular relates to an adaptive coupling prediction model for the gradual collapse of a barrier lake, which is used for deriving the flow process of the flood flow of the barrier lake. Background technique [0002] Scholars at home and abroad have carried out a lot of dam break flood research work, and have proposed a series of dam break models, most of which are calculated and estimated by the gradual collapse model of earth-rock dams. Based on the water-sand theory, Xie Renzhi proposed a unified formula for the maximum peak flow of dam breaks , and analyzed the process of instantaneous collapse and gradual dam collapse, and some scholars conducted quantitative comparisons on the characteristics of the calculation formula of the breach flow and the key factors in the formula, and also summarized and compared the existing models. [0003] Xie Renzhi’...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive coupling prediction model for the gradual collapse of a barrier lake in view of the difficulty in confirming the erosion parameters of the breach in the prior art and the inconvenience caused to the estimation of the formation process of the dam collapse

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