Institute for Urban Water Management, Department of Hydrosciences, TU Dresden, Bergstraße 66, 01069 Dresden, Germany E-mail:
Water Sci Technol. 2020 Jan;81(1):40-51. doi: 10.2166/wst.2020.070.
Understanding the factors that affect the occurrence of failures in urban drainage networks (UDNs) is a key concept for developing strategies to improve the reliability of such systems. Although a lot of research has been done in this field, the relationship between UDN structure (i.e. layout) and its functional failures is still unclear. In this context, the present study focuses first on determining which are the most common sewer layout topologies, based on a data set of 118 UDNs, and then on analyzing the relationship between these and the occurrence of node flooding using eight subnetworks of the sewer system of Dresden, Germany, as a study case. A method to 'quantify' the topology of a UDN in terms of similarity to a branched or meshed system, referred to as Meshness, is introduced. Results indicate, on the one hand, that most networks have branched or predominantly branched topologies. On the other hand, node flooding events in networks with higher Meshness values are less likely to occur, and have shorter durations and smaller volumes than in predominantly branched systems. Predominantly meshed systems are identified then as more reliable in terms of flooded nodes and flooding volumes.
理解影响城市排水管网（UDN）故障发生的因素是制定提高系统可靠性策略的关键概念。尽管在这一领域已经进行了大量研究，但 UDN 结构（即布局）与其功能故障之间的关系仍不清楚。在这种情况下，本研究首先根据包含 118 个 UDN 的数据集，确定最常见的下水道布局拓扑结构，然后使用德国德累斯顿下水道系统的 8 个子网络作为研究案例，分析这些拓扑结构与节点洪灾发生之间的关系。引入了一种方法，可根据与分支或网状系统的相似性“量化”UDN 的拓扑结构，称为网状度（Meshness）。结果表明，一方面，大多数网络具有分支或主要分支拓扑结构。另一方面，网状度较高的网络中节点洪灾事件发生的可能性较小，持续时间和体积也小于主要分支系统。因此，具有网状拓扑结构的系统在节点洪灾和洪灾体积方面被认为更可靠。
