SCIENTIA GEOGRAPHICA SINICA ›› 2022, Vol. 42 ›› Issue (11): 2028-2038.doi: 10.13249/j.cnki.sgs.2022.11.017

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Layout and Optimization of Urban Water System Connectivity Based on the Graph Theory

Fu Chun1,2(), Deng Junpeng3,4, Ouyang Huanrui5, Fu Yaozong3, Zhang Jing1   

  1. 1. Schcol of Public Policy and Administration, Nanchang University, Nanchang 330031, Jiangxi, China
    2. School of Economics and Management, Nanchang University, Nanchang 330031, Jiangxi, China
    3. School of lnfrastructure Engineening, Nanchang University, Nanchang 330031, Jiangxi, China
    4. Fuzhou Emergency Rescue Support Center, Fuzhou 344100, Jiangxi, China
    5. School of Economics and Management, Nanchang University, Nanchang 330031,?Jiangxi, China
  • Received:2021-07-01 Revised:2022-03-12 Online:2022-11-10 Published:2023-01-05


Urban expansion has cut off the originally connected rivers and lakes, and repairing the connectivity of the water systems in urban areas is an important part of the construction of sponge cities and water ecological civilization cities. Based on the ‘point-edge’ quantitative relationship in landscape ecology, three water system connectivity evaluation indicators (α), node connection rate (β) and network connectivity (γ) are established, and the ‘node-corridor’ of the water system in Nanchang is drawn. ‘Tao’ has a directed map and uses urban lake water drainage and pollution as the starting point to optimize the connectivity of the urban water system. Studies have shown that: 1) The urban water system of Nanchang has uneven distribution of corridors, and there are fewer corridors connecting the lake node with other water system nodes; 2) The optimized urban water system is compared with the current water system. The degree (α) is increased by 75%, the node connection rate (β) is increased by 14.88%, and the network connection degree (γ) is increased by 14.63%. In the optimization of urban water system connectivity, we should not blindly increase lake corridors by pursuing connectivity too much. We should maintain a balance between connectivity and the number of corridors connected to the lake to prevent water pollutants from silting up in the lake.

Key words: Graph Theory, water system connection, MIKE21, drainage and pollution, Nanchang City

CLC Number: 

  • TV122