Ecological environment water demand threshold quantification method based on river overall health

Abstract

The invention relates to an ecological environment water demand threshold quantification method based on river overall health. The method comprises the following steps of constructing a river health condition variable fuzzy set evaluation model; establishing a causal relation graph that an ecological subsystem, a hydrological subsystem, a water environment subsystem and a social economic subsysteminfluence the river health condition, constructing a system dynamics-variable fuzzy set coupling model, verifying whether the coupling model can effectively represent the actual conditions; and establishing a nonlinear function relationship between the flow and the river health comprehensive index, determining an upper limit value and a lower limit value of an ecological environment water demandthreshold based on the river overall health by adopting an unknown inflection point threshold value determination method, and ensuring that the river health level is in a normal state. The method is simple, is easy to operate and is accurate in quantification, can effectively solve the river ecological environment water demand threshold, guarantees the normal water supply of a river, maintains thehealth of a river ecological system, and has the good economic and social benefits.

Description

Technical field [0001] The invention belongs to the technical field of river environmental protection, in particular to a method for quantifying the water demand threshold of an ecological environment based on the overall health of the river. Background technique [0002] The threshold of river ecological environmental water demand is an external condition to ensure that the ecological environmental water demand is met. It is an important technical parameter for the rational allocation of water resources in a river basin, and plays an important guiding role in the rational allocation of water resources. The river system is a large and complex system that includes society, economy, and nature. However, there are complex interactions among economic, social, and natural factors, and it is a non-linear, unbalanced, dynamic, and coupled problem. For an ecosystem, the driving force for its transition from one state to another comes from the qualitative or quantitative changes of one or...

AI Technical Summary

Problems solved by technology

The quantitative research on the water demand threshold of river ecological environment has gone through the minimum ecological water demand at the earliest stage, to the biological water demand process in different periods, and then to the river functional water demand. Different methods are adopted for different research objects in each stage, and less consideration is given to Under high human disturbance, the interaction between socioeconomic factors, water quality and quantity attributes of water resources, and river health did not realize the linkage change between river flow and other factors affecting river health

The ultimate goal of the research on the threshold value of river ecological environment water requirement is to restore and protect the health of the river ecosystem. In order to maintain the health of the river ecosystem, it is necessary to establish a quantification method for the threshold value of river ecological environment water requirement to solve the above problems, but so far there is no public to report

Images