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Optimization of Multi-reservoir Operation considering Water Demand Uncertainty in the Han River Basin  

Chung, Gun-Hui (고려대학교 방재과학기술연구센터)
Ryu, Gwan-Hyeong (고려대학교 건축 사회환경공학부)
Kim, Joong-Hoon (고려대학교 건축 사회환경공학부)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.10, no.1, 2010 , pp. 89-102 More about this Journal
Abstract
Future uncertainty on water demand caused by future climate condition and water consumption leads a difficulty to determine the reservoir operation rule for supplying sufficient water to users. It is, thus, important to operate reservoirs not only for distributing enough water to users using the limited water resources but also for preventing floods and drought under the unknown future condition. In this study, the reservoir storage is determined in the first stage when future condition is unknown, and then, water distribution to users and river stream is optimized using the available water resources from the first stage decision using 2-stage stochastic linear programming (2-SLP). The objective function is to minimize the difference between target and actual water storage in reservoirs and the water shortage in users and river stream. Hedging rule defined by a precaution against severe drought by restricting outflow when reservoir storage decreases below a target, is also applied in the reservoir operation rule for improving the model applicability to the real system. The developed model is applied in a system with five reservoirs in the Han River basin, Korea to optimize the multi-reservoir system under various future water demand scenarios. Three multi-purposed dams - Chungju, Hoengseong, and Soyanggang - are considered in the model. Gwangdong and Hwacheon dams are also considered in the system due to the large capacity of the reservoirs, but they are primarily for water supply and power generation, respectively. As a result, the water demand of users and river stream are satisfied in most cases. The reservoirs are operated successfully to store enough water during the wet season for preparing the coming drought and also for reducing downstream flood risk. The developed model can provide an effective guideline of multi-reservoir operation rules in the basin.
Keywords
2-stage Stochastic Linear Programming; Multi-Reservoir Operation; Dry-Season Water Supply; Water Demand Uncertainty; Hedging-Rule;
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Times Cited By KSCI : 1  (Citation Analysis)
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