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Response of Fish Community to Building Block Methodology Mimicking Natural Flow Regime Patterns in Nakdong River in South Korea

Author

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  • Soohong Kim

    (Division for Integrated Water Management, Water and Land Research Group, Korea Environment Institute (KEI), Sejong 30147, Korea)

  • Kichul Jung

    (Division for Integrated Water Management, Water and Land Research Group, Korea Environment Institute (KEI), Sejong 30147, Korea)

  • Hyeongsik Kang

    (Division for Integrated Water Management, Water and Land Research Group, Korea Environment Institute (KEI), Sejong 30147, Korea)

Abstract

Water regulation and flood control of rivers are changing due to streamflow depletion following industrialization and urbanization, significantly impacting aquatic ecosystems. Therefore, restoration of the ecological environment is necessary to maintain a healthy river ecosystem. For ecosystem restoration, the amount of discharge from dams must be controlled and the appropriate environmental flow must be calculated according to the fish species. The change in the flow through the dam due to hydropeaking directly impacts the fish. This study aimed to construct a building block methodology (BBM) using dam inflows in the Gudam Bridge basin upstream of the Nakdong River, build a River2D model of this area, and calculate the natural flow regime and the weighted usable area (WUA). The analysis of the scenarios for the whole period (2006–2020) and by flow regime showed that WUA decreased in some periods, but improved overall in the scenario reflecting the BBM. For Zacco platypus , a dominant fish species of the Gudam Bridge, WUA decreased by ~11% in some periods (in September) but the habitat improvement effect measured up to 79%. Changing the dam discharge pattern by considering the flow regime seemed more effective in improving the habitat of fish living downstream.

Suggested Citation

  • Soohong Kim & Kichul Jung & Hyeongsik Kang, 2022. "Response of Fish Community to Building Block Methodology Mimicking Natural Flow Regime Patterns in Nakdong River in South Korea," Sustainability, MDPI, vol. 14(6), pages 1-23, March.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:6:p:3587-:d:774480
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    References listed on IDEAS

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    1. Aurelian Cosmin Moldovan & Tomi Alexandrel Hrăniciuc & Valer Micle & Nicolae Marcoie, 2023. "Research on the Sustainable Development of the Bistrita Ardeleana River in Order to Stop the Erosion of the Riverbanks and the Thalweg," Sustainability, MDPI, vol. 15(9), pages 1-22, April.

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