Optimal Recovery from Disruptions in Water Distributions Networks PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Optimal Recovery from Disruptions in Water Distributions Networks PDF full book. Access full book title Optimal Recovery from Disruptions in Water Distributions Networks by Munir Ahmad Nayak. Download full books in PDF and EPUB format.
Author: Munir Ahmad Nayak
Publisher:
ISBN:
Category :
Languages : en
Pages : 73
Get Book Here
Book Description
In this study, we develop a bi-level optimization model for recovery of a disrupted water distribution system. The model minimizes the total cost of recovery of the system. The cost includes the repair cost of the system and systemic impact of disruption on the system during the repair process. The systemic cost is calculated in terms of the unmet demand while the system is still damaged. The upper level problem is to schedule the repair tasks, and the lower level problem is to optimize the supply of water (optimal mitigation) given the schedule from upper level problem. The upper level problem is solved using Simulated Annealing, and the lower level problem uses a Generalized Reduced Gradient algorithm. We first apply and validate the model on a small water distribution system with only three elements damaged due to disruption. In this case, the recovery process requires tasks that can be performed in only one mode. We later apply the model to a larger and more complex water distribution system with eight elements damaged due to disruption. We perform three different experiments on this system . In the first experiment, limited resources are available at each time period. In the second experiment, the resources are increased by 50%, and in third experiment, some tasks are provided with an additional mode. The results show that the availability of resources has a significant impact on total cost of recovery of systems. Adding modes to a few tasks can help in reducing the total cost of disruption on the system.
Author: Munir Ahmad Nayak
Publisher:
ISBN:
Category :
Languages : en
Pages : 73
Get Book Here
Book Description
In this study, we develop a bi-level optimization model for recovery of a disrupted water distribution system. The model minimizes the total cost of recovery of the system. The cost includes the repair cost of the system and systemic impact of disruption on the system during the repair process. The systemic cost is calculated in terms of the unmet demand while the system is still damaged. The upper level problem is to schedule the repair tasks, and the lower level problem is to optimize the supply of water (optimal mitigation) given the schedule from upper level problem. The upper level problem is solved using Simulated Annealing, and the lower level problem uses a Generalized Reduced Gradient algorithm. We first apply and validate the model on a small water distribution system with only three elements damaged due to disruption. In this case, the recovery process requires tasks that can be performed in only one mode. We later apply the model to a larger and more complex water distribution system with eight elements damaged due to disruption. We perform three different experiments on this system . In the first experiment, limited resources are available at each time period. In the second experiment, the resources are increased by 50%, and in third experiment, some tasks are provided with an additional mode. The results show that the availability of resources has a significant impact on total cost of recovery of systems. Adding modes to a few tasks can help in reducing the total cost of disruption on the system.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309494583
Category : Social Science
Languages : en
Pages : 137
Get Book Here
Book Description
Resilient supply chains are crucial to maintaining the consistent delivery of goods and services to the American people. The modern economy has made supply chains more interconnected than ever, while also expanding both their range and fragility. In the third quarter of 2017, Hurricanes Harvey, Irma and Maria revealed some significant vulnerabilities in the national and regional supply chains of Texas, Florida, the U.S. Virgin Islands, and Puerto Rico. The broad impacts and quick succession of these three hurricanes also shed light on the effectiveness of the nation's disaster logistics efforts during response through recovery. Drawing on lessons learned during the 2017 hurricanes, this report explores future strategies to improve supply chain management in disaster situations. This report makes recommendations to strengthen the roles of continuity planning, partnerships between civic leaders with small businesses, and infrastructure investment to ensure that essential supply chains will remain operational in the next major disaster. Focusing on the supply chains food, fuel, water, pharmaceutical, and medical supplies, the recommendations of this report will assist the Federal Emergency Management Agency as well as state and local officials, private sector decision makers, civic leaders, and others who can help ensure that supply chains remain robust and resilient in the face of natural disasters.
Author: Ahmed Assad
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Water distribution networks (WDNs) are critical infrastructure systems that secure needed supply of potable water to the public. Efficient management of WDNs has always been a primary concern for decision-makers, particularly in events of natural disasters, deliberate attacks, human-made accidents and/or sudden failures. Aging and deterioration of WDNs further exacerbate their vulnerability and likelihood of service disruption. Previous hazards reveal that classical risk-based approaches are not sufficient to prevent disruptions of WDNs. As a result, the concept of resilient WDNs has emerged to cope up with inevitable disruptions that are becoming more frequent. The objective of this research is to develop a holistic resilience-based management model for WDNs. In this context, WDNs is sought to be strong enough to withstand unforeseen disruptions with a minimum performance impact and to recover rapidly after a service interruption. Firstly, a multi-attribute metric is developed for assessing resilience of WDNs based on robustness and redundancy. Attributes from graph theory are employed to quantify the network redundancy. Robustness is measured by integrating the reliability and criticality of pipe segments of the network. Multi-attribute utility theory and Fuzzy analytical network process are exploited to estimate the criticality of water segments based on a set of economic, social, and environmental factors. Survival analysis and maximum likelihood estimate are employed to dynamically determine reliability of pipe segments. Censored inter-failure time data are leveraged to model the deterioration behavior of homogenous cohorts of pipe. The developed metric was used to measure the resilience of a real-life WDN in the City of London, Ontario. The results obtained showed an average of 5% variation when compared to previously developed flow-based and topology-based metrics. In the second step, rapidity and resourcefulness qualities are considered to develop a resilience-based restoration model. A failure scenario causing multiple simultaneous breaks across the network is simulated to investigate the recovery process. A stochastic multi-objective optimization model that maximizes resilience while minimizing the total time and cost of the recovery process is then formulated. This model accounts for different restoration methods, relocation time and cost of restoration crews, and uncertainties in recovery estimates. The optimum restoration plan encompasses a sequence of failed segments restorations along with the restoration method. This plan achieved 4% cost saving, 48% duration reduction, and 4% resilience improvement when compared to current planning practices. The last step involves developing a multi-objective resilience enhancement model so that WDNs can be better prepared for future disruptions. The aim is to maximize resilience of WDNs while minimizing the life cycle cost and carbon emissions of enhancement actions. Optimum enhancement interventions are firstly determined and clustered into work packages before an optimized schedule is generated considering various operational and managerial factors. Applied to a section of an actual WDN of 34 km in a length and average age of 40 years, resilience was increased by 20% with CAD 1.65 million of current investment. The study of that network indicates that a cost-saving of 32% could be attained when adopting the developed model over ongoing portfolio management practices. The novel resilience-driven management model introduced in this research is expected to assist decision-makers better assess and enhance resilience of WDNs and improve restoration planning. The developed model can assist city mangers in allocation and utilization of resources more effectively in development of optimized plans for resilient and sustainable WDNs.
Author: Manish Kumar
Publisher: Springer Nature
ISBN: 9811546681
Category : Science
Languages : en
Pages : 399
Get Book Here
Book Description
This book talks about the dynamics of the surface water-groundwater contaminant interactions under different environmental conditions across the world. The contents of the book highlight trends of monitoring, prediction, awareness, learning, policy, and mitigation success. The book provides a description of the background processes and factors controlling resilience, risk, and response of water systems, contributing to the development of more efficient, sustainable technologies and management options. It integrates methodologies and techniques such as data science and engineering, remote sensing, modelling, analytics, synthesis and indices, disruptive innovations and their utilization in water management, policy making, and mitigation strategies. The book is intended to be a comprehensive reference for students, professionals, and researchers working on various aspects of science and technology development. It will also prove a useful resource for policy makers and implementation specialists.
Author: Giuseppe Pezzinga
Publisher: MDPI
ISBN: 3038975567
Category : Technology & Engineering
Languages : en
Pages : 174
Get Book Here
Book Description
The Special Issue on Advances in Water Distribution Networks (WDNs) explores four important topics of research in the framework of WDNs, namely simulation and optimization modelling, topology and partitioning, water quality, and service effectiveness. With regard to the first topic, the following aspects are addressed: pressure-driven formulations, algorithms for the optimal location of control valves to minimize leakage, the benefits of water discharge prediction for the remote real time control of valves, and transients generated by pumps operating as turbines. In the context of the second topic, a topological taxonomy of WDNs is presented, and partitioning methods for the creation of district metered areas are compared. In relation to the third topic, the vulnerability to trihalomethane is assessed, and a statistical optimization model to minimize heavy metal releases is presented. Finally, the fourth topic focusses on the estimation of non-revenue water, including leakage and unauthorized consumption, and on the assessment of service under intermittent supply conditions.
Author: Haresh Gurnani
Publisher: Springer Science & Business Media
ISBN: 0857297783
Category : Technology & Engineering
Languages : en
Pages : 339
Get Book Here
Book Description
One of the most critical issues facing supply chain managers in today’s globalized and highly uncertain business environments is how to deal proactively with disruptions that might affect the complicated supply networks characterizing modern enterprises. Supply Chain Disruptions: Theory and Practice of Managing Risk presents a state-of the-art perspective on this particular issue. Supply Chain Disruptions: Theory and Practice of Managing Risk demonstrates that effective management of supply disruptions necessitates both strategic and tactical measures – the former involving optimal design of supply networks; the latter involving inventory, finance and demand management. It shows that managers ought to use all available levers at their disposal throughout the supply network – like sourcing and pricing strategies, providing financial subsidies, encouraging information sharing and incentive alignment between supply chain partners – in order to tackle supply disruptions. The editors combine up-to-date academic research with the latest operational risk management practices used in industry to demonstrate how theoreticians and practitioners can learn from each other. As well as providing a wealth of knowledge for students and professors who are interested in pursuing research or teaching courses in the rapidly growing area of supply chain risk management, Supply Chain Disruptions: Theory and Practice of Managing Risk also acts as a ready reference for practitioners who are interested in understanding the theoretical underpinnings of effective supply disruption management techniques.
Author: Jin-Kao Hao
Publisher: Springer Science & Business Media
ISBN: 3642291236
Category : Computers
Languages : en
Pages : 280
Get Book Here
Book Description
This book constitutes the refereed proceedings of the 12th European Conference on Evolutionary Computation in Combinatorial Optimization, EvoCOP 2012, held in Málaga, Spain, in April 2012, colocated with the Evo* 2012 events EuroGP, EvoBIO, EvoMUSART, and EvoApplications. . The 22 revised full papers presented were carefully reviewed and selected from 48 submissions. The papers present the latest research and discuss current developments and applications in metaheuristics - a paradigm to effectively solve difficult combinatorial optimization problems appearing in various industrial, economic, and scientific domains. Prominent examples of metaheuristics are evolutionary algorithms, simulated annealing, tabu search, scatter search, memetic algorithms, variable neighborhood search, iterated local search, greedy randomized adaptive search procedures, estimation of distribution algorithms, and ant colony optimization.
Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher:
ISBN:
Category : Federal aid to energy development
Languages : en
Pages : 396
Get Book Here
Book Description
Author: United States. Congress. House. Committee on Appropriations. Subcommittee on Energy and Water Development
Publisher:
ISBN:
Category : Federal aid to energy development
Languages : en
Pages : 1740
Get Book Here
Book Description
Author: Adolfo Crespo Márquez
Publisher: Springer Nature
ISBN: 3030642283
Category : Technology & Engineering
Languages : en
Pages : 311
Get Book Here
Book Description
This book gathers selected peer-reviewed papers from the 14th World Congress on Engineering Asset Management (WCEAM), which was held in Singapore on 28–31 July 2019, as well as papers presented during the 1st WCEAMOnline event which focused on the ramifications of Covid-19 on infrastructure systems. This book covers a wide range of topics in engineering asset management, including: asset management services provisioning; servitization; decision-making; asset management systems; industrial Internet of things; and vulnerability and resilience of infrastructure systems. The breadth and depth of these state-of-the-art, comprehensive proceedings make them an excellent resource for asset management practitioners, researchers and academics, as well as undergraduate and postgraduate students.
