Ecological restoration effect evaluation method for different types of river reaches of medium and small rivers

Abstract

The invention discloses an ecological restoration effect evaluation method for different types of river reaches of medium and small rivers. The method comprises the following steps: step 1, dividing the types of the river reaches of the medium and small rivers; 2, constructing a medium and small river ecological restoration effect evaluation index system; 3, weight optimization of evaluation indexes of different types of river reaches of medium and small rivers; step 4, determining the evaluation index scoring standard of the ecological restoration effect of the medium and small rivers; 5, judging the ecological restoration effect grade of the medium and small rivers; and 6, determining restoration target thresholds of different types of river reaches of the medium and small rivers. According to the evaluation method provided by the invention, differentiated weighting is carried out on evaluation indexes of different types of river reaches, so that the problems that an existing river ecological restoration effect evaluation method is not prominent in key point and low in accuracy are solved, and a river management department can be effectively guided to carry out river ecological restoration according to local conditions; the method has reference significance for design and operation maintenance of river ecological restoration engineering of the same type.

Description

technical field [0001] The invention relates to river ecological protection, in particular to a method for evaluating ecological restoration effects of different types of river sections of medium and small rivers. Background technique [0002] The ecological environment protection of rivers is very important, especially with the development of economy and the advancement of science and technology, the focus of water ecological environment protection work in the river basin has been extended from "large arteries - big rivers" to "capillaries - medium and small rivers". my country's catchment area is 200-3000km 2 There are nearly 10,000 small and medium-sized rivers in China. Compared with the large and large rivers that have received widespread attention, the small and medium-sized rivers connecting more cities are more seriously disturbed by human activities, and their role in providing a better living environment for the people is also more prominent. Different from the pr...

AI Technical Summary

Problems solved by technology

The evaluation of water quality improvement effect is easy to operate and widely used, but it can only reflect the change of water quality, and cannot provide accurate feedback on the ecological conditions such as physical habitats and aquatic organisms; the evaluation of project benefits focuses on the ecological environment and social conditions after the project is implemented. The evaluation of economic benefits cannot fully reflect the changes in the river ecosystem before and after the implementation of the project; the evaluation of the ecological restoration effect based on the index system method not only incorporates indicators such as hydrology, water quality, habitat, and biology into the evaluation method, but also includes the types of human activities. , water services, etc. as evaluation indicators, which enrich the connotation of river ecological restoration effect evaluation, but the evaluation results are not strong pertinence, do not take into account the differences in restoration priorities among different types of river sections, and cannot effectively guide river management departments to carry out river ecological restoration according to local conditions. repair

Therefore, it is of great significance to propose a method for evaluating the ecological restoration effect of different types of river sections in small and medium-sized rivers, which is of great significance to scientifically guide the ecological restoration of rivers, but there has been no public report so far.

Images