Method for inquiring stage design flood of reservoir

Abstract

The invention belongs to the technical field of flood forecasting, and relates to a method for inquiring the stage design flood of a reservoir. The method comprises the following steps: flood information with randomness and regularity is converted into directional data by applying a round fractional step method, and determining the stage time intervals of the reservoir by calculating a vector average angle, average radius and concentration ratio of the directional data; establishing a trivariate combined distribution model based on a three-dimensional asymmetric Copula function for constructing edge distribution to be P-III type distribution, and analyzing the correlation among stage flood by applying the trivariate combined distribution model; determining a deterministic relationship between the reservoir stage design flood frequency and a flood control standard by applying the trivariate combined distribution model; and finally determining the stage design flood frequency and a design value. According to the method, the defect of a conventional design flood inquiry technology can be overcome, so that the result can fulfill the flood control standard and can reflect the seasonal regulation of the flood.

Description

technical field [0001] The invention belongs to the technical field of flood forecasting, and relates to a calculation method for staged design flood of a reservoir. Background technique [0002] The design flood refers to the flood that may occur in the target area that is drawn up for the design of water conservancy projects such as reservoirs and meets the specified flood control design standards, that is, the maximum flood that the reservoir is expected to fortify. If an excessively large flood is selected as the design basis, although the safety is high, the project cost will be too high; on the contrary, if the selected flood is too small, the investment will be reduced, but the safety will be reduced. Therefore, it is necessary to balance the two aspects of safety and economy, and choose the appropriate basis for the design of flood control capacity of the project. [0003] In the past, the reservoir dispatching design often used the annual design flood as the basis,...

AI Technical Summary

Problems solved by technology

For example, the common staged design flood calculation method assumes that the frequency of each stage is equal to the reciprocal of the flood control standard, which often makes the staged design flood fail to meet the flood control standard

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