Calculation Method of Connectivity of River Network and Water System Based on Improved Graph Theory and Hydrological Simulation

Abstract

The invention discloses a river network water system connectivity calculation method based on graph theory improvement and hydrology simulation. The method includes: step A, extracting a digital rivernetwork water system graph, generalizing the same as a topological structure, and establishing an adjacency matrix describing the river network structure according to basic principles of graph theory; step B, establishing a study-area HEC-HMS hydrology model, and calculating a maximum value of flow appearing at each river network node under a typical rainfall process; step C, coupling the adjacency matrix and the flow values, which are obtained in the two above-mentioned steps, together through construction of communication factors to generate an improved adjacency matrix; and step D, calculating river network water system connectivity on the basis of the adjacency matrix and the improved adjacency matrix. A communication degree calculation method in the graph theory is redesigned from two angles of the static structure and the dynamic runoff process of a river network in the invention, and an application range of the method disclosed by the invention is enabled to be significantly expanded as compared with application ranges of traditional methods.

Description

technical field [0001] The invention relates to the field of river network water system connectivity evaluation, in particular to a river network water system connectivity calculation method based on improved graph theory and hydrological simulation. Background technique [0002] The practice of water system connectivity can be traced back to 2400 BC. Early connectivity projects in my country, such as Hangou and Lingqu, played a very important role in promoting benefits and eliminating harm, and governing the country. Although it has been practiced for a long time, the concept of "river and lake water system connectivity" was not clearly put forward until 2009. Its theoretical research is still in its infancy, and the research on the evaluation methods of water system connectivity is still insufficient. [0003] In the "Research Report on Maintaining a Healthy Yangtze River and Promoting Human-Water Harmony" by the Yangtze River Water Conservancy Commission, "water system co...

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Problems solved by technology

For example, in the article "Evaluation Method of River Channel-Flood System Connectivity Based on Graph Theory" (Zhao Jinyong, 2011), graph theory is applied to the evaluation of water system connectivity, but graph theory can only study whether the water flow channel is connected, and does not consider the carrying capacity of the channel. Another example is the article "Evaluation of River Network Connectivity Based on Water Flow Resistance and Graph Theory" (Xu Guanglai, 2012), which is closest to the technical level of this patent application. Improvement, but the water flow resistance is derived from the channel section and water depth, ignoring the influence of rainfall, evaporation, seepage, human activities, etc. It is not comprehensive and accurate enough to characterize the water exchange capacity

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