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An Improved Aggregation–Decomposition Optimization Approach for Ecological Flow Supply in Parallel Reservoir Systems

Author

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  • Inkyung Min

    (Department of Civil, Environmental and Plant Engineering, Konkuk University, Seoul 05029, Republic of Korea)

  • Nakyung Lee

    (Department of Civil, Environmental and Plant Engineering, Konkuk University, Seoul 05029, Republic of Korea)

  • Sanha Kim

    (Department of Civil, Environmental and Plant Engineering, Konkuk University, Seoul 05029, Republic of Korea)

  • Yelim Bang

    (Department of Civil, Environmental and Plant Engineering, Konkuk University, Seoul 05029, Republic of Korea)

  • Juyeon Jang

    (Department of Civil, Environmental and Plant Engineering, Konkuk University, Seoul 05029, Republic of Korea)

  • Kichul Jung

    (Department of Planning and Strategy, Korea Environment Institute, Sejong 30147, Republic of Korea)

  • Daeryong Park

    (Department of Civil and Environmental Engineering, Konkuk University, Seoul 05029, Republic of Korea)

Abstract

The efficient operation of multi-reservoirs is highly beneficial for securing supply for prevailing demand and ecological flow. This study proposes a monthly hedging rule-based aggregation–decomposition model for optimizing a parallel reservoir system. The proposed model, which is an aggregated hedging rule for ecological flow (AHRE), uses external optimization to determine the total release of the reservoir system based on improved hedging rules—the optimization model aims to minimize water demand and ecological flow deficits. Additionally, inner optimization distributes the release to individual reservoirs to maintain equal reservoir storage rates. To verify the effectiveness of the AHRE, a standard operation policy and transformed hedging rules were selected for comparison. Three parallel reservoirs in the Naesung Stream Basin in South Korea were selected as a study area. The results of this study demonstrate that the AHRE is better than the other two methods in terms of supplying water in line with demand and ecological flow. In addition, the AHRE showed relatively stable operation results with small water-level fluctuations, owing to the application of improved hedging rules and a decomposition method. The results indicate that the AHRE has the capacity to improve downstream river ecosystems while maintaining human water use and provide a superior response to uncertain droughts.

Suggested Citation

  • Inkyung Min & Nakyung Lee & Sanha Kim & Yelim Bang & Juyeon Jang & Kichul Jung & Daeryong Park, 2024. "An Improved Aggregation–Decomposition Optimization Approach for Ecological Flow Supply in Parallel Reservoir Systems," Sustainability, MDPI, vol. 16(17), pages 1-22, August.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:17:p:7475-:d:1466774
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