Complex Network Analysis of Water Distribution Systems in Their Dual Representation Using Isolation Valve Information

Zischg, Jonatan; Reyes-Silva, Julian D.; Klinkhamer, Christopher; Krueger, Elisabeth; Krebs, Peter; Rao, P. Suresh C.; Sitzenfrei, Robert

doi:10.1061/9780784482353.046

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…Cities prepare for chronic shocks by installing isolation valves in the distribution networks to limit the affected population (Ozger & Mays, ). In case of a lack of adequate isolation valves within the network, the entire distribution zones can be affected (Zischg et al, ). Distribution zone size depends on topography, network design, and operational strategies, and the cases investigated here are in the order of 2–3% of the population (Abu Amra et al, ; CONAGUA, ).…”

Section: Methodsmentioning

confidence: 99%

Resilience Dynamics of Urban Water Supply Security and Potential of Tipping Points

et al. 2019

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Cities are the drivers of socioeconomic innovation and are also forced to address the accelerating risk of failure in providing essential services such as water supply today and in the future. Here, we investigate the resilience of urban water supply security, which is defined in terms of the services that citizens receive. The resilience of services is determined by the availability and robustness of critical system elements or “capitals” (water resources, infrastructure, finances, management efficacy, and community adaptation). We translate quantitative information about this portfolio of capitals from seven contrasting cities on four continents into parameters of a coupled system dynamics model. Water services are disrupted by recurring stochastic shocks, and we simulate the dynamics of impact and recovery cycles. Resilience emerges under various constraints, expressed in terms of each city's capital portfolio. Systematic assessment of the parameter space produces the urban water resilience landscape, and we determine the position of each city along a continuous gradient from water insecure and nonresilient to secure and resilient systems. In several cities stochastic disturbance regimes challenge steady‐state conditions and drive system collapse. While water insecure and nonresilient cities risk being pushed into a poverty trap, cities which have developed excess capitals risk being trapped in rigidity and crossing a tipping point from high to low services and collapse. Where public services are insufficient, community adaptation improves water security and resilience to varying degrees. Our results highlight the need for resilience thinking in the governance of urban water systems under global change pressures.

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Section: Methodsmentioning

confidence: 99%

Resilience Dynamics of Urban Water Supply Security and Potential of Tipping Points

et al. 2019

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“…Several researchers have recently focused on the optimization, reliability-based design, and analysis of WDN that include isolation valves (Kim et al 2019;Zischg et al 2019;Fiorini Morosini et al 2020;Giustolisi 2020). Zischg et al (2019) used complex network analysis to evaluate and compare the valving of various WDNs by examining their dual topology. Their method enables a rapid comparison of different valve scenarios but does not offer a prioritization scheme for specific valves or segments.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Pipe and isolation valve failure-impact analysis and prioritization model for an urban water distribution network

Beker

Kansal

2023

Journal of Hydroinformatics

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Pipe and isolation valve failure in an urban water distribution network (WDN) causes service interruption to the water users. It is important to identify and prioritize the maintenance of the most severe impact-causing pipes and valve failures. This study investigates the impacts of such failures in terms of the number of isolation elements, the number of affected customers, and the supply shortfall (SS). The study proposes an impact-based prioritization model for pipe and isolation valve repair/replacement in a WDN using the analytic hierarchy process (AHP). The WDN modeling, simulation, and generation of segments are carried out using the WaterGEMS software. The proposed methodology is illustrated with the help of a real-time WDN of Dire Dawa city in Ethiopia. Through the study, it is noticed that each valve/pipe failure has varied impacts and gets reduced with the increase in valve density. Further, the SS is the most important parameter for prioritizing the maintenance. The failure of the valves and pipes significantly affects the system's performance and should be repaired/replaced on priority basis. It is hoped that the proposal will help the decision-makers in the optimal utilization of limited resources available for repair/ maintenance.

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“…Recently, various approaches, mainly based on topological analysis and tools proposed by the Complex Network Theory (CNT), have been adopted to evaluate the influence of the IVS in various applications. Huzsvár et al (2019) proposed the WDNs classification using the segment graph; while Zischg et al (2019) proposed a methodology for studying WDNs reliability and valve placement assessment by using network topology and IVS information. Wéber et al (2020) proposed a novel methodology based on a topological metric that allows to individuate the critical segments in WDNs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the isolation valve system in water distribution networks using the segment graph

Simone

Cristo

Giustolisi

2022

Water Resour Manage

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The mechanical reliability of Water Distribution Networks (WDNs) is a relevant technical and scientific issue. During planned maintenance or unplanned interruptions, the affected area must be isolated by valves shutdown. This operation involves the alteration of the network structure, i.e., the domain of the hydraulic system, and for this reason the isolation valve system plays a central role. Some studies started to consider the presence of the isolation valve system in WDNs reliability analysis.Accordingly, this work uses the Complex Network Theory to analyse the isolation valve system performance and to assess the importance of the segments generated by valves shutdown. Differently from the classic complex network theory approach, in this work the recently proposed WDN-relevance-based betweenness centrality is applied to the segment graph to introduce information about the relevance of the different elements into the network, considering geometric and hydraulic parameters, such as length, demand, risk of disconnection, etc. The proposed strategy also suggests an improvement in the representation of the segment graph with respect to the presence of parallel edges.The strategy is presented using a small network, while it is demonstrated and discussed using a real WDN. The results indicate that the WDN-relevance-based betweenness centrality allows to effectively assess the importance of the segments generated by valves shutdowns, also providing indications to improve the isolation valve system design.

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Complex Network Analysis of Water Distribution Systems in Their Dual Representation Using Isolation Valve Information

Cited by 9 publications

References 24 publications

Resilience Dynamics of Urban Water Supply Security and Potential of Tipping Points

Resilience Dynamics of Urban Water Supply Security and Potential of Tipping Points

Pipe and isolation valve failure-impact analysis and prioritization model for an urban water distribution network

Analysis of the isolation valve system in water distribution networks using the segment graph

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