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Enhanced potential ecological risk induced by a large scale water diversion project

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Abstract

River regulation by the construction of reservoirs represents one of the greatest challenges to the natural flow regime and ecological health of riverine systems globally. The Danjiangkou (DJK) Reservoir is the largest reservoir on the Hangjiang River and commenced operations in 1967. The reservoir was upgraded in 2012 to provide water resource for the South–North water transfer project through central China. However, the effect of the reservoir operations on the downstream hydrological regime and ecological health of the Hanjiang River following the upgrade (increase in dam height and reservoir capacity) has not been examined thus far. The daily discharge series from four stations along the main stem of the Hanjiang River, including a site upstream, were examined from 1950 to 2017. The study series was divided into three periods based on the difference stages of the reservoir operation: (1) 1950–1966, (2) 1967–2012 and (3) 2013–2017. The nature of hydrological alteration, ecological flow requirement and potential ecological risk during the different periods were investigated. The results clearly indicate that the DJK reservoir has significantly modified the hydrological regime in the middle and downstream section of the Hanjiang River, with most significant modifications recorded immediately downstream of the reservoir. None of the observed ‘Range of Variability Approach’ hydrological indicators fell within the expected range at Huangjiagang following the increase in reservoir capacity. As a result, the ecological flow requirements could not be guaranteed, and the frequency and intensity of ecodeficit increased. The river ecosystem immediately downstream of the dam was observed to be at high risk of ecosystem degradation during the post-dam periods considered.

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Availability of data and material

All data used during the study were provided by a third party. Direct requests for these materials may be made to the provider as indicated in the Acknowledgments.

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Acknowledgements

Changjiang Water Resources Commission, China are thanked for providing the primary data for the research.

Funding

Financial support is gratefully acknowledged from the project (51909058, 51709074) supported by the National Natural Science Foundation of China, the Project (B200202033) supported by the Fundamental Research Funds for the Central Universities, National Key Research and Development Programs of China (2016YFA0601501).

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MY, PW and XL were the main contributors to this work and was responsible for developing and implementing the methods, data generation, and analysis; NG, QL, GW and JZ supervised the research.

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Correspondence to Meixiu Yu or Qiongfang Li.

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Yu, M., Wood, P., van de Giesen, N. et al. Enhanced potential ecological risk induced by a large scale water diversion project. Stoch Environ Res Risk Assess 34, 2125–2138 (2020). https://doi.org/10.1007/s00477-020-01861-6

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