Water‐Supply Operations during Drought: Continuous Hedging Rule

Shih, Jhih‐Shyang; ReVelle, Charles

doi:10.1061/(asce)0733-9496(1994)120:5(613)

Cited by 145 publications

(71 citation statements)

References 15 publications

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“…In previous studies, several types of water supply operation rules for guiding reservoir releases to meet planned demands have been suggested, such as the standard operating policy (SOP) [1,2], the linear decision rule (LDR) [3], the parametric rule [4], and diverse forms of hedging policy [5][6][7][8]. Among the operation rules mentioned above, the hedging policy can avoid one potential catastrophic deficit of large magnitude that may occur in future by allowing a sequence of smaller deficits in current periods [9] and has been widely applied for managing single reservoir water supply operations during drought periods [5,[8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Among the operation rules mentioned above, the hedging policy can avoid one potential catastrophic deficit of large magnitude that may occur in future by allowing a sequence of smaller deficits in current periods [9] and has been widely applied for managing single reservoir water supply operations during drought periods [5,[8][9][10][11][12]. However, multireservoir systems with water supply tasks often have complex structures of more than one reservoir in series or parallel topologies and numerous parameter variables.…”

Section: Introductionmentioning

confidence: 99%

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Extraction and Preference Ordering of Multireservoir Water Supply Rules in Dry Years

Kang

Zhang

Ding

et al. 2016

Water

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This paper presents a new methodology of combined use of the nondominated sorting genetic algorithm II (NSGA-II) and the approach of successive elimination of alternatives based on order and degree of efficiency (SEABODE) in identifying the most preferred multireservoir water supply rules in dry years. First, the suggested operation rules consists of a two-point type time-varying hedging policy for a single reservoir and a simple proportional allocation policy of common water demand between two parallel reservoirs. Then, the NSGA-II is employed to derive enough noninferior operation rules (design alternatives) in terms of two conflicting objectives (1) minimizing the total deficit ratio (TDR) of all demands of the entire system in operation horizon, and (2) minimizing the maximum deficit ratio (MDR) of water supply in a single period. Next, the SEABODE, a multicriteria decision making (MCDM) procedure, is applied to further eliminate alternatives based on the concept of efficiency of order k with degree p. In SEABODE, the reservoir performance indices and water shortage indices are selected as evaluation criteria for preference ordering among the design alternatives obtained by NSGA-II. The proposed methodology was tested on a regional water supply system with three reservoirs located in the Jialing River, China, where the results demonstrate its applicability and merits.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extraction and Preference Ordering of Multireservoir Water Supply Rules in Dry Years

Kang

Zhang

Ding

et al. 2016

Water

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“…The effective operation of water-supply projects is a key point for mitigating regional drought disasters resulted from water-deficiency [1][2][3][4][5][6][7][8]. Hashimoto et al [8] and Shih et al [9] proposed the indexes of reliability, resilience and vulnerability which expressed reservoir operation performance during drought, and recognized that these indexes should form the risk assessment system for reservoir water-supply. The three indexes have been applied extensively into the researches on water resources planning and management since they were put forward, and the application of the performance index into planning design and operation simulation of reservoirs has gone through a process from simple description to complicated employment.…”

Section: Introductionmentioning

confidence: 99%

Optimization on Water Resource System Operation Policy during Drought

Fang¹,

Cheng²,

Yan³

2011

JWARP

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The mixed linear programming model is commonly recognized to be an effective means for searching optimal reservoir operation policy in water resources system. In this paper a multi-objective mixed integer linear programming model is set up to obtain the optimal operation policy of multi-reservoir water supply system during drought, which is able to consider the operation rule of reservoir-group system within longer-term successive drought periods, according to the basic connotation of indexes expressing the water-supply risk of reservoir during drought, that is, reliability, resilience and vulnerability of reservoir water supply, and mathematical programming principles. The model-solving procedures, particularly, the decomposition-adjustment algorithm, are proposed based on characteristics of the model structure. The principle of modelsolving technique is to decompose the complex system into several smaller sub-systems on which some ease-solving mathematical models may be established. The objective of this optimization model aims at maximizing the reliability of water supply and minimizing the maximum water-shortage of single time-period within water-supply system during drought. The multi-objective mixed integer linear programming model and proposed solving procedures are applied to a case study of reservoir-group water-supply system in Huanghe-Huaihe River Basin, China. The desired water-shortage distribution within the system operation term and the maximum shortage of single time-period are achieved. The results of case study verifies that the lighter water-shortage distributed evenly among several time-periods can avoid the calamities resulted from severe water shortage concentrated on a few time-periods during drought.

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“…In all reservoirs, water can be either released for beneficial activities or retained in the reservoir for possible enhanced applications in the future. This simple criterion becomes extremely complex when future inflows are uncertain and economic benefits of released water are not deterministic and constant (Shih and ReVelle, 1994). In most cases, uncertainty is a significant factor in the decision-making process and considerable risks are involved in the decision policies.…”

Section: Introductionmentioning

confidence: 99%

Optimal cultivation rules in multi‐crop irrigation areas

Bozorg‐Haddad

Moradi-Jalal

Mirmomeni³

et al. 2008

Irrigation and Drainage

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A linear programming model is developed for annual cultivation rules of multi-crop irrigation areas in a reservoir-irrigation system. The objective is to maximize the annual benefit of the system by assigning annual irrigation areas as well as monthly irrigation schedules over the planning horizon. The annual irrigation areas are considered to be a linear function of both total volume of storage at the end of the last operating year and the average inflow rate of the current year. The methodology is applied to a previously analyzed problem, without considering operational rules. Results are compared with those of a linearized modeling of the problem and the advantages of the proposed approach are discussed. Furthermore, results indicate that although there is a 40% decrease in the value of the objective function when using cultivation rules, the model is nonetheless a helpful tool for planners and/or stakeholders to decide at the beginning of each year how much and which type of product should be cultivated. This has been verified by applying the extracted rules with a generated five-year inflow time series. RÉ SUMÉUn modèle de programmation linéaire est développé pour optimiser les assolements annuels dans des secteurs de polyculture irriguée par réservoir. L'objectif est de maximiser le bénéfice annuel du système par l'assolement et les dotations d'eau mensuelles. Les surfaces irriguées annuelles sont considérés comme une fonction linéaire du volume stocké à la fin de la précédente campagne et du taux moyen d'apport de l'année en cours. La méthodologie est appliquée à un problème précédemment analysé, sans considérer les règles opérationnelles. Les résultats sont comparés à ceux du modèle linéaire et les avantages de l'approche proposée sont discutés. Les résultats montrent que malgré la diminution de 40% de la valeur de la fonction objectif en utilisant les règles opérationnelles, le modèle est néanmoins un outil utile pour des planificateurs et/ou les partenaires pour décider en début de campagne combien et quel type de culture devrait être engagée. Ceci a été vérifié en appliquant les règles extraites à une série d'apport générée sur cinq ans. Les résultats montrent la robustesse des règles face à l'incertitude des paramètres du modèle.

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Water‐Supply Operations during Drought: Continuous Hedging Rule

Cited by 145 publications

References 15 publications

Extraction and Preference Ordering of Multireservoir Water Supply Rules in Dry Years

Extraction and Preference Ordering of Multireservoir Water Supply Rules in Dry Years

Optimization on Water Resource System Operation Policy during Drought

Optimal cultivation rules in multi‐crop irrigation areas

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