Redundancy Index of Lifeline Systems

Hoshiya, Masaru; Yamamoto, Kinya

doi:10.1061/(asce)0733-9399(2002)128:9(961)

Cited by 21 publications

(9 citation statements)

References 8 publications

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“…(14), each one being a function of its corresponding Q i value, the values of P '' n are calculated by Eq. (8), and are used instead of P n in Eq.…”

Section: Incorporating the Effects Of Design Parameters Of The Networmentioning

confidence: 99%

“…From the hydraulic point of view, the redundancy and reliability have been extensively studied by Awumah and his colleagues [11], and by Kalungi and Tanyimboh [13]. In case of seismically damaged networks, Hoshiya and Yamamoto [14], and Hoshiya and his colleagues [12], proposed a redundancy index with regard to the entropy of an event of damage modes conditioned on system damage. Awumah and his colleagues [9,11] seem to be the earliest researchers to propose the use of the Shannon's entropy function [16] as a surrogate measure for assessing reliability of water distribution networks.…”

Section: Introductionmentioning

confidence: 99%

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Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

2017

JCE

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Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters A modified entropy-based criterion for evaluating reliability of water distribution networks is presented in the paper. Design and hydraulic parameters, as well as failure probabilities for individual links, are considered. For this purpose, a new weighting factor is defined based on the proportion of total outflow at each node to the total network dissipated power. Another weighting factor is defined based on the relation between the flow rate of a link and the total flow rates in the network, to take into account the capacity of individual links, as compared to that of the overall network. Ocjena pouzdanosti vodoopskrbne mreže pomoću informacijske entropije primjenom projektnih/hidrauličkih parametara U radu se prikazuje primjena kriterija temeljenog na svojstvu entropije za ocjenjivanje pouzdanosti vodoopskrbne mreže. Pri tome se u obzir uzimaju projektni i hidraulički parametri te vjerojatnost potpunog ispada iz rada (otkazivanja) cjevovoda. Na temelju odnosa ukupnog izlaznog protoka iz pojedinog čvora i ukupnog gubitka snage, u čitavoj mreži definiran je novi ponderski faktor. Definiran je i dodatni ponderski faktor koji se temelji na odnosu protoka u pojedinoj dionici i ukupnom protoku u mreži, pri čemu se u obzir uzima protočni kapacitet pojedine dionice u odnosu na cjelokupnu mrežu.Ključne riječi: vodoopskrbna mreža, ocjena pouzdanosti, projektni i hidraulični parametri, informacijska entropija Vorherige Mitteilung

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“…(14), each one being a function of its corresponding Q i value, the values of P '' n are calculated by Eq. (8), and are used instead of P n in Eq.…”

Section: Incorporating the Effects Of Design Parameters Of The Networmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

2017

JCE

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“…His concept of resilience is based on the principle that the failure or increased demand will tend to increase the dissipation of the internal energy, and consequently resilience is measured as the surplus energy available in the network. The design of redundancy in water distribution systems is important even under normal operating conditions, but additional measures such as extra supply points and larger pipe capacity may need to be employed to account for the impacts hazards have on a system (Hoshiya and Yamamoto, 2002).…”

Section: Key Aspects Of Water Infrastructure Resiliencymentioning

confidence: 99%

Disaster Resilience of Drinking Water Infrastructure Systems to Multiple Hazards

Matthews¹,

Piratla²,

Matthews³

2014

Structures Congress 2014

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The increased dependability of modern societies on deteriorated water infrastructure (i.e., transmission and distribution systems) places special emphasis on its continuous functioning. Consequently, disaster resilience of these systems during and after hazards is vital for the response and recovery to the event. Water infrastructure system managers must understand the critical aspects of resiliency such as planning for hazardous conditions by anticipating the impacts and subsequently taking necessary measures to minimize consequences, and also prevent the disruption of other infrastructure systems (e.g., electrical infrastructure) by understanding and dealing with the critical interdependencies. A majority of these aspects are not always clear until the system has been exposed to the hazard, which is why we can learn so much from recent disasters. This paper will outline the key aspects of drinking water infrastructure system resiliency (e.g., system vulnerability, redundancy, management and response plans, etc.) and the parameters will be analyzed using historical hazardous events (e.g., Earthquakes and Hurricanes) to determine what the best practices were and should be moving forward. Recommendations for incorporating the best practices into rehabilitating existing systems and future designs will be discussed.

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“…al. 2002), utility lifelines (Nojima 2012), redundancy index of lifeline systems (Hoshiya and Yamamoto 2002). In 2004, Ueno et.…”

Section: Introductionmentioning

confidence: 99%

Optimal Restoration Strategy of a Water Pipeline Network in Surigao City, Philippines

Garciano

Tanhueco

et al. 2018

GEOMATE

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Quick recovery of water services immediately after an earthquake is critical. This is to minimize hazards to environmental sanitation and consequent health problems caused by the lack of potable water supply. It is necessary therefore that water lifeline operators establish restoration strategies to deal with damage scenarios in their respective concession areas specifically during extreme seismic events. The recent 6.7 magnitude earthquake in Surigao City due to the movement of the Philippine Fault Zone: Surigao segment underscored this need. However due to the complexity of the network a systematic restoration sequence that minimizes restoration time and maximizes delivery of water service should be employed. In this research, the authors employed Horn's algorithm to determine the optimal restoration strategy of a pipeline network in Surigao City, Philippines. The repair sequence starts with the determination of a minimal spanning tree of the given pipeline network. The water source is designated as the root of this tree while the nodes represent the water demand at specific areas. The edges of the tree structure representing the pipelines connect the nodes. The assigned numeric value or weight of an edge (link) denotes the time to repair that specific pipeline. This value is a function of the length of the pipeline. The results show that an optimal job sequence may be carried out by considering maximal ratios of expanding family trees within the network. A least penalty function is a consequence of the optimal repair job sequence.

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Redundancy Index of Lifeline Systems

Cited by 21 publications

References 8 publications

Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

Disaster Resilience of Drinking Water Infrastructure Systems to Multiple Hazards

Optimal Restoration Strategy of a Water Pipeline Network in Surigao City, Philippines

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