不同拓扑结构雨水管网对系统承涝韧性的影响

Impact of Topological Structure on Waterlogging Resilience of Storm Sewer Network

由于城市化进程加快和气候变化,城市雨水管网系统的性能受到巨大影响,导致城市内涝频发。拓扑结构作为雨水管网系统的基本特征之一,其变化会对系统性能产生一定影响,韧性是评价雨水管网系统性能的一个指标,目前关于不同拓扑结构对系统承涝韧性的影响尚不明晰。为此,以深圳坪山某研究区域为例,通过构建SWMM模型,结合图论和拓扑结构分析方法来定量表述雨水管网特征,确定关键节点的位置和系统网格度,以进行影响分析并进一步探究优化管网拓扑结构的方法。结果表明,新增管道引入环路可完成管网的升级改造,以提高系统韧性;在综合中心性高(I3)的节点处新增管道能最大程度地提升管网系统的韧性,同时在I3类中网格度从10%提升至20%,系统韧性的提升率可达到6.57%。

The performance of urban storm sewer network system has been significantly impacted by the acceleration of urbanization and climate change,leading to frequent urban waterlogging.The topological structure is a fundamental characteristic of storm sewer network system,and any changes to it will inevitably impact the system’s performance.Resilience serves as an important indicator for evaluating the performance of the storm sewer network system.Currently,the impact of different topological structures on the system’s waterlogging resilience remains unclear.This paper quantitatively expressed the storm sewer network characteristics in Pingshan,Shenzhen by utilizing SWMM,graph theory and topological structure analysis methods,and determined the key node locations and system grid degree,so as to analyze the impact and further explore the methods for optimizing pipe network topology.Introducing the loop by adding new pipelines realized the upgrading of the pipe network,thereby improving the system’s resilience.The addition of pipelines at nodes with high comprehensive centrality(I3)maximized the resilience of the storm sewer network system.In class I3,the grid degree was increased from 10%to 20%,resulting in a 6.57%improvement in the system’s resilience.