Flood redistribution method

Abstract

The invention relates to a flood redistribution method for calculating corresponding cascade reservoir group design flood in a same-frequency region composition method, which adopts the proportion of the instantaneous flow rate in a region flood process of various nodes in a typical process and the instantaneous flow rate of corresponding flood process for redistribution of the corresponding flood process. The flood redistribution method provided in the invention better solves the problem of corresponding flood redistribution in the same-frequency region composition method, provides an effective path for corresponding flood distribution work of multiple regions hereafter, fully utilizes the typical flood process composition of various regions and also can meet the water balance requirements of all over the basin during the flood routing control interval.

Description

technical field [0001] The invention relates to a method for redistribution of corresponding floods in the same-frequency area composition method in the design flood calculation of cascade reservoir groups. Background technique [0002] In recent years, my country has gradually formed a situation of developing cascade reservoirs on rivers with rich water resources, and the calculation of design floods affected by upstream cascade reservoirs has become increasingly complex. The redistribution of corresponding floods in the current same-frequency area composition method recommends in principle that "the corresponding floods occurring in the remaining subregions should be allocated according to the composition ratio of typical floods". If a subregion in the upstream has the same frequency as the design section, and the corresponding flood process interval contains multiple subregions, the corresponding flood process needs to be redistributed to each subregion according to the p...

AI Technical Summary

Problems solved by technology

[0016] However, in the actual design flood analysis and calculation of large and medium-sized water conservancy and hydropower projects, for a watershed with multiple cascaded reservoirs with regulating performance, the area of ​​the watershed is often large, and the characteristics of the storm and flood in the upper and lower reaches of the watershed are inconsistent. The design flood parameters of each section in the upper and lower reaches of the basin vary greatly

Especially when the Cv and Cs values ​​of the design flood are greatly different, the design flood process shape of each design section in the upstream and downstream of the watershed will be greatly different. The typical shape of the corresponding flood process will be quite different, such as figure 1 As shown in Fig. 1, the corresponding flood hydrographs corresponding to the projections have sudden changes at the junctions of different periods

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