Abstract
Vulnerability analysis of urban drainage networks plays an important role in urban flood management. This study analyzes and compares the vulnerability of tree and loop systems under various rainfall events to structural failure represented by pipe blockage. Different pipe blockage scenarios, in which one of the pipes in an urban drainage network is assumed to be blocked individually, are constructed and their impacts on the network are simulated under different storm events. Furthermore, a vulnerability index is defined to measure the vulnerability of the drainage systems before and after the implementation of adaptation measures. The results obtained indicate that the tree systems have a relatively larger proportion of critical hydraulic pipes than the loop systems, thus the vulnerability of tree systems is substantially greater than that of the loop systems. Furthermore, the vulnerability index of tree systems is reduced after they are converted into a loop system with the implementation of adaptation measures. This paper provides an insight into the differences in the vulnerability of tree and loop systems, and provides more evidence for development of adaptation measures (e.g., tanks) to reduce urban flooding.
Highlights
Urban drainage systems are an increasingly important part of urban infrastructure that conveys stormwater and wastewater away from urban areas and contributes to the general well-being of the urban population [1,2,3,4,5,6]
The above evaluation models have played an important role in the vulnerability analysis of water distribution systems, but there were a few studies for urban drainage systems [2,32,33,34,35,36,37,38]
This paper aims to analyze the vulnerability of tree and loop drainage systems to structural failure represented by pipe blockage
Summary
Urban drainage systems are an increasingly important part of urban infrastructure that conveys stormwater and wastewater away from urban areas and contributes to the general well-being of the urban population [1,2,3,4,5,6]. In the field of water distribution systems, different quantitative analysis methods have been developed for vulnerability assessment, such as probability and statistics methods, comprehensive index methods, Markov Latent Effects modeling methods [14,19,20,21,22,23,24,25,26,27,28,29,30]. The above evaluation models have played an important role in the vulnerability analysis of water distribution systems, but there were a few studies for urban drainage systems [2,32,33,34,35,36,37,38]. Three tree systems and three loop systems in Dalian, China are used as case studies; their vulnerabilities are assessed under different design rainfall events and critical pipes of each system are revealed. A vulnerability index (VI) is defined to measure the vulnerability of the drainage systems before and after the implementation of adaptation measures
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