Method for evaluating influence of urbanization on plain river network water system structure and connectivity

Abstract

The invention discloses a method for evaluating the influence of urbanization on a plain river network water system structure and connectivity. The method comprises the following steps: S1, determining an evaluation year; s2, selecting a water system structure evaluation index and a water system connectivity evaluation index; s3, collecting basic data; s4, calculating each water system structure evaluation index and each water system connectivity evaluation index in the evaluation year; s5, calculating the overall change degree of the water system structure and the overall change degree of thewater system connectivity by adopting a change degree method; s6, evaluating the change degree of the urbanization interference on the river network water system structure and the water system connectivity according to the calculation result of the overall change degree of the water system structure and the overall change degree of the water system connectivity. According to the method, the variation difference between the evaluation indexes is considered, the overall variation degree is also considered, the core index causing variation is not excessively controlled by a certain single index,and the evaluation result is more comprehensive and objective.

Description

technical field [0001] The invention relates to a method for evaluating the impact of urbanization on plain river network structure and connectivity, and belongs to the technical field of water environment management. Background technique [0002] Although the river and lake water system is an important product of natural evolution, its development process is also closely related to human activities. It provides support for human economic and social development, and it has also become one of the ecosystems most strongly affected by human activities. Urbanization It is the most obvious impact on the river network and water system among various human activities. Since the reform and opening up, the urbanization process has been comprehensively promoted, and the urbanization rate has risen from 18% in 1978 to 52.6% in 2012. Human activities are becoming more and more frequent, and man-made transformation of nature become an inevitability. 60% of the world's rivers have undergo...

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Problems solved by technology

With the development of the economy and the acceleration of the urbanization process, the trend of simplification and trunking of the river network structure in my country is becoming more and more obvious, and the connectivity of the water system is getting weaker and weaker, which leads to poor drainage of floods and de...

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