Quantification of River Network Connectivity and Optimization of Gates and Dams Based on Connectivity Index and Graph Theory

Abstract

The invention discloses a river network connectivity quantifying method based on a connectivity index and a graph theory. A river network is generalized into a directed river network graph model which takes reaches as vertexes and gate dams as sides; the river network graph model is represented by an adjacent matrix, a path, of the shortest distance, between any two reaches in the adjacent matrix is calculated, and multiple accessible paths are obtained; and a connectivity index RCI of a netted water system of the river network is calculated. A gate dam optimizing method based on the connectivity index and graph theory comprises that gate dams are removed from the river network one by one successively, the RCI is recalculated each time, the obtained RCIs are ordered from high to low, the ordering sequence is a priority dismounting sequence, and a river network gate dam is optimized according to the priority dismounting sequence. The connectivity quantifying method breaks through limitation of the application range of connectivity indexes of a tree-shaped water system, can be used for evaluation for connectivity change of the river network water system, and can be suitable for optimization of netted river systems with tedious hydraulic engineering and interlaced and complex artificial canal systems.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a river network connectivity quantification method based on connectivity index and graph theory, and also relates to a gate and dam system optimization method based on the connectivity quantification method. Background technique [0002] The analysis of river network connectivity is an important work in the study of river network evolution and water system restoration. At present, it is common to generalize the river network into an undirected graph from the perspective of the water system pattern, and use the edge connectivity KL and point connectivity Kv to represent the connectivity of the river network. On this basis, the river network graph model is used to study the impact of water conservancy projects on river network connectivity, and the tree-like water system connectivity index DCI is often used for evaluation. For example, Cote, D et ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a river network connectivity quantification method based on connectivity index and graph theory, which combines the network water system connectivity index and graph theory, and solves the problem that the tree-like water system connectivity index is not suitable for network water system connectivity. Questions about sexuality

[0005] Another object of the present invention is to provide a gate and dam system optimization method based on the above-mentioned connectivity quantification method, which solves the problem that the existing connectivity quantification method is difficult to apply to complex network water system optimization

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