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Discussion on different impoundment and release orders of huge cascade reservoir system and its effects in the course of flood regulation

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Abstract

Cascade reservoir operation is an interactive process in dealing with the floods of the watershed. There are complex hydrological and hydraulic relations between the upstream and downstream reservoirs. However, current reservoir operating rules do not consider cascade reservoir as a system, leaving the impact of release orders on flood control effects unclear. Therefore, this study proposes three types of cascade reservoir operation modes based on different reservoir release orders: sequential impoundment mode (scheme1, 5), reverse-order impoundment mode (scheme2, 3, 6), and alternate impoundment mode (scheme4, 7). Additionally, the joint improved artificial bee colony and K-means clustering algorithms are adopted to classify floods in the basin. The influence of different impoundment and release orders on the effects of flood regulation in the lower reaches of the Jinshajiang River was discussed. The results show that: 1.The alternate impoundment mode is generally applicable to the three typical floods in the lower reaches of the Jinshajiang River. For the third category of large floods that have the worst operating effect, the peak flow reduction rate (PFRR) can reach up to 41.8% for a flood of once-in-100-year return period. 2. The reverse-order impoundment mode has the best scheduling effect on the second category of large floods,the PFRR can reach up to 41.6% for a 100-year flood. 3. The scheme7 presents evident advantages in the joint flood control of cascade reservoir, achieving an average PFRR of 42.8% for a 100-year flood. Furthermore, the implementation of alternate impoundment mode in the cascade reservoir can effectively alleviate flood control pressure on the Chuanjiang River and make a significant contribution to overall flood control efforts within the Yangtze River basin.

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Acknowledgements

The authors acknowledge the financial support granted the National Natural Science Foundation of China (No.42207084), the Natural Science Basic Research Program of Shaanxi Province (No.2023-JC-QN-0372), the Joint Fund Project of the Natural Science Foundation of Shaanxi Province (No. 2021JLM-54), the Key Research and Development Project of Shaanxi Province (No. 2019SF-237), and the Fundamental Research Funds for the Central Universities, CHD (Nos. 300102291507, 300102269201).

Funding

This work was supported by the National Natural Science Foundation of China [No.42207084], the Natural Science Basic Research Program of Shaanxi Province [No.2023-JC-QN-0372], the Joint Fund Project of the Natural Science Foundation of Shaanxi Province [No. 2021JLM-54], the Key Research and Development Project of Shaanxi Province [No. 2019SF-237], and the Fundamental Research Funds for the Central Universities, CHD [Nos. 300102291507, 300102269201].

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FY: Conceptualization, methodology, writing, investigation, programming, formal analysis, visualization. ZL and ZG: Supervision, touch up language, funding acquisition, reviewing, data curation. YY: Reviewing, formal analysis, programming. YX: Reviewing and programming.

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Correspondence to Zhao Liu.

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You, F., Liu, Z., Guan, Z. et al. Discussion on different impoundment and release orders of huge cascade reservoir system and its effects in the course of flood regulation. Stoch Environ Res Risk Assess 37, 4661–4677 (2023). https://doi.org/10.1007/s00477-023-02532-y

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  • DOI: https://doi.org/10.1007/s00477-023-02532-y

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