Developing an optimal valve closing rule curve for real-time pressure control in pipes

Bazargan‐Lari, Mohammad Reza; Kerachian, Reza; Afshar, H.; Bashi-Azghadi, Seyyed Nasser

doi:10.1007/s12206-012-1208-7

Cited by 42 publications

(15 citation statements)

References 23 publications

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“…Staring from a population that represents all candidate solutions, NSGA‐II applies the typical operators used by genetic algorithms, such as cross‐over, mutation and selection, in order to accelerate the process of sorting the candidate solutions according to the level of nondominations. Moreover, NSGA‐II is based on the elitist principle which means that only the elites of a population are given the opportunity to compose the next generation of population (Deb et al ; Bazargan‐Lari et al ). Several studies in the field of coastal aquifer management have studied and gave evidence of the superiority of such evolutionary algorithm with respect to other available methods (Dhar and Datta ; Sreekanth and Datta , ).…”

Section: Solution Approachmentioning

confidence: 99%

Optimal Location of Wells for Storage and Recovery of Surplus Desalinated Water in Coastal Aquifers

et al. 2019

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Storage of water in aquifers using injection wells is an efficient way for utilizing excess desalinated water in arid regions. In this investigation we estimate the benefits of optimally recharging seasonal surplus desalinated water into a strategic coastal aquifer already benefitting from natural recharge of flash‐floods water by a recharge dam. Since, usually the buyers of desalinated water commit to purchase surplus desalinated water under take‐or‐pay contracts, any attempt in utilizing the paid water is beneficial. Coastal cities are observing an increased urbanization leaving limited space for aquifer recharge infrastructure. In order to determine the optimal location of wells and maximize the use of surplus desalinated water available in winter period, a decision tool combining a numerical groundwater flow simulation model (MODFLOW) with an optimization model is developed. The results of this study show that increasing the number of wells from the existing 45 wells to 173 would allow storing 31.4 million cubic meter per year of excess desalinated water into the aquifer that can be used during later during summer months. The net benefit would reach US$55 million/year while the cost of drilling the new wells is US$5.11 million.

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Section: Solution Approachmentioning

confidence: 99%

Optimal Location of Wells for Storage and Recovery of Surplus Desalinated Water in Coastal Aquifers

et al. 2019

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“…It is a fast multi-objective optimization model which expedites the process of sorting the populations according to the level of non-dominations. Since a mating pool, using the parents and child populations, is used by NSGA-II for including all previous and current population members, the elitism is ensured in this approach (Bashi-Azghadi et al 2010;Bazargan-Lari et al 2009;Bazargan-Lari et al 2013;Deb et al 2002).…”

Section: Multi-objective Optimization Modelmentioning

confidence: 99%

An Optimization-Simulation Approach for Groundwater Abstraction under Recharge Uncertainty

Zekri

Triki

Al‐Maktoumi

et al. 2015

Water Resour Manage

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Droughts and climate variability cause uncertainties on water supply especially in arid regions and coastal aquifers' over-exploitation causes seawater intrusion. Since the rate and extent of aquifer recharge is often very uncertain, determining the optimal groundwater abstraction is a challenging task. In this paper a framework is proposed for estimating the optimal abstraction of groundwater for urban supply under uncertainty and under complex conditions of water table fluctuations and seawater intrusion. It is based on a combination of several models: (i) a Monte-Carlo Simulation (MCS) to incorporate the uncertainties in groundwater recharge, (ii) a numerical groundwater flow model, MODFLOW to simulate the effects of abstractions on the water table fluctuations and seawater intrusion and (iii) a multi-objective optimization model to generate the set of Pareto optimal solutions for each recharging scenario. Maximizing the benefit to the water utility, minimizing the average groundwater table level fluctuations and minimizing the seawater intrusion are the objectives of the model. A fast multi-objective evolutionary algorithm is used to obtain the Pareto efficient solutions for each recharging scenario. Compromise programming (CP) is then used to select the closest solutions to the ideal. Finally, the amount of optimal reliable groundwater abstraction is estimated using a cumulative distribution function. The proposed methodology is applied to a coastal aquifer in the western part of Muscat metropolitan area, Oman. The results have Water Resour Manage shown that annual groundwater abstraction volume may range from 12.7 to 18.8 Mm 3 compared to 6.8 Mm 3 currently pumped. This would result in an economic benefit of $10.5 million to $15.4 million/year. On the other hand the aquifer's maximum annual mean drawdown would range from 0.7 to 0.9 m.

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“…Especially the method of characteristic (MOC), as an FDM, is nowadays the most popular method. It is widely used to simulate the water hammers in various engineering practices, such as valve closing [14][15][16][17][18], and pump failure [19]. Not only that, it has also been applied to special system and boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of Water Hammer in Gravitational Pipe Flow with Continuous Air Entrainment

Zhang

Wan

Shi

2018

Water

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Water hammer is an undesired hydraulic shock phenomenon in water supply pipe systems. It is very important to simulate water hammer for preventing the hazard of over pressure. In order to predict the transient pressure caused by a valve closing in a gravitational pipe with continuous air entrainment, a numerical model based on the Lax-Wendroff format is established, and the matched boundary model is provided. Compared with the traditional methods, this study provides another access by considering the influence of the pipe flow velocity on the wave propagation to simulate transient processes. A corresponding experiment is conducted to optimize the numerical model. Based on the experimental result, an additional friction function is proposed to evaluate the influence of the air content on the attenuation. The result shows that the energy dissipation of the shock waves may be underestimated in air-water mixture flow using the common steady friction. By introducing the additional friction function, the improved model can more accurately simulate the attenuation of the water hammer in the gravitational pipe with continuous air entrainment. As there are plenty of practical water supply systems running with air content, the improved Lax-Wendroff Method (LWM) is valued in accurately predicting water hammer processes especially in those conditions.

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Developing an optimal valve closing rule curve for real-time pressure control in pipes

Cited by 42 publications

References 23 publications

Optimal Location of Wells for Storage and Recovery of Surplus Desalinated Water in Coastal Aquifers

Optimal Location of Wells for Storage and Recovery of Surplus Desalinated Water in Coastal Aquifers

An Optimization-Simulation Approach for Groundwater Abstraction under Recharge Uncertainty

Experimental and Numerical Simulation of Water Hammer in Gravitational Pipe Flow with Continuous Air Entrainment

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