Riverway ecological runoff process evaluation method based on matter element analysis

Abstract

The invention provides a riverway ecological runoff process evaluation method based on matter element analysis. The method comprises the steps that multiple existing methods are used for calculating and studying ecological flows of a drainage basin in all months, and the ecological flows are used for forming different ecological runoff processes; evaluation levels and division standards of the ecological runoff processes are determined; according to the ecological flows of all the months, matter elements to be evaluated are constructed, and according to the determined evaluation standards, classical domain matter elements and joint domain matter elements are constructed; the weight of all the evaluation indices is determined; the relevancy degree of all the evaluation indexes to all the evaluation levels and the comprehensive relevancy degree of all the evaluation levels are calculated, and the evaluation levels are determined according to the comprehensive relevancy degree; according to the evaluation levels, of the ecological runoff processes, calculated and obtained through different methods, and combined with the ecological water requirements of the studied drainage basin, the ecological runoff processes are determined comprehensively. The method constructs the evaluation standards of the ecological runoff processes, can conduct objective evaluation on the ecological runoff processes, is a new method for inquiring into the riverway ecological runoff processes, and also provides technical supports for ecological remediation of a downstream dewatering stream of a hydropower station.

Description

technical field [0001] The invention relates to a method for evaluating the ecological runoff process of a river course based on matter-element analysis, and belongs to the field of water resources management and protection. Background technique [0002] Diversion-type hydropower stations are generally built in small and medium-sized mountainous rivers with large slopes, and use pipes or channels to divert the water flow to the downstream where a large drop can be formed. Its construction led to a sharp decrease in the runoff of some river sections, resulting in the formation of dewatered river sections between the dam site and the tail water of the power plant, which had a negative impact on the hydrological regime and ecological quality of the river. In 2016, the National Energy Administration issued the "Thirteenth Five-Year Plan for Hydropower Development", requiring ecological restoration of small and medium-sized river basins with relatively prominent environmental pro...

AI Technical Summary

Problems solved by technology

[0004] Many research results have been obtained on the calculation method of river ecological runoff process, but the calculation method of ecological runoff applicable to different rivers may be different. At present, there are relatively subjective factors in the selection of the method, and most of them focus on qualitative description, and there is no clear evaluation method

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