Water system connectivity evaluation method

Abstract

The invention discloses a water system connectivity evaluation method. The method comprises the steps of digitalizing a river network of a target area to obtain river network data reflecting water system connectivity; establishing an evaluation system for the water system connectivity according to the river network data; selecting principal components in a system by adopting a principal componentanalysis method, and weighting the principal components by adopting an entropy method; and determining a water system connectivity comprehensive score of the area, thereby analyzing the change of thewater system connectivity, wherein the evaluation system for the water system connectivity consists of a primary index layer and a secondary index layer; quantity connectivity indexes include river network density and a water surface rate; structure connectivity indexes include a river network growth coefficient, an area-length ratio and an average path length; and function connectivity indexes include a clustering coefficient, a node degree and average node betweenness. The indexes are classified and counted; the comprehensive score is obtained through the principal component analysis methodand the entropy method; and the change of the water system connectivity is objectively analyzed, so that a basis is provided for river-lake health and water system function analysis.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a water system connectivity evaluation method, which belongs to the field of water environment. Background technique [0002] With the acceleration of urbanization, natural water systems are increasingly affected by human activities. Phenomena such as population migration, soil erosion, and lake deposition are gradually changing the flood storage capacity, water environment health, and hydrological cycle of water systems. The function of the water system is closely related to its degree of connectivity. On the one hand, the connectivity of the water system provides a basic structural place for the migration and transformation of materials and the flow of energy. On the other hand, the connectivity of the water system plays a functional role in maintaining the ecological evolution of rivers and lakes. In order to quantitatively characterize the connectivity of regional water systems, some s...

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Problems solved by technology

[0004] At present, relevant scholars' research on water system connectivity mainly focuses on the value and significance of water system connectivity, the impact of urbanization on water system connectivity, and the changes in water system connectivity in a certain area. Most of them select a certain side from different perspectives. Key related indicators, or single or comprehensive evaluation of water system connectivity, but in fact, the factors affecting water system connectivity in different regions are diverse, and the influence of the factors that play a role is also unstable. A set of fixed indicators It is obviously not representative to measure the connectivity of water systems in different time and space

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