Linear reservoir retention confluence and nested watershed (multiple sub watersheds) confluence method

Abstract

The invention discloses a linear reservoir retention confluence and nested watershed (multiple sub watersheds) confluence method. The method includes collecting long series data of rainfall capacity, evaporation capacity and runoff volume of a researched watershed; calculating a runoff generation process according to the rainfall capacity, the evaporation capacity and the runoff volume by a hydrological model; taking a confluence path in the watershed as N linear reservoirs in series connection by the Nash linear reservoir method to acquire a Nash instant unit hydrograph, wherein the previous water reservoir becomes an inflow of the next water reservoir; introducing a retention factor alpha to describe the water-holding capacity of the linear water reservoirs; simulating the Nash instant unit hydrograph by a binomial to improve a confluence method of the hydrological model. The advantage that the instant unit hydrograph describes the watershed confluence process in terms of time and space is kept, and the complex parameter problems in application are avoided, so that the method is applicable to hydrological simulation of large watersheds, and particularly, has significant practical value in research on water circulation of the watersheds under climate change. The method is simple and convenient to apply, and simulation results given by the method are objective, scientific and high in accuracy.

Description

technical field [0001] The invention relates to the field of hydrological applications, in particular to a linear reservoir confluence method. Background technique [0002] The hydrological model of a watershed is an important theoretical basis for simulating the hydrological process of a watershed and understanding the hydrological laws of a watershed. It is one of the important basic research topics, and it is also the main tool for studying the natural laws of hydrology and solving practical problems in hydrology. [0003] The confluence process is an important part of the hydrological model, and the complexity of the confluence model depends on the time resolution of the model and the relative relationship between the confluence delay. The time scale of the hydrological model is generally daily or hourly, and the confluence process is very important to the discharge of the outlet section of the watershed, especially the peak formation. For small-scale watersheds, the c...

AI Technical Summary

Problems solved by technology

The above-mentioned traditional methods either have complex formulas (such as the Saint-Venant equation and instantaneous unit line) that cannot be directly applied in large-scale watersheds, or the description of watershed confluence is too simplified and lacks objective representation, which affects the accuracy of large-scale watershed simulations (equal flow time line method)

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