水利水电技术（中英文）2025，Vol.56Issue(6)：64-76,13.DOI:10.13928/j.cnki.wrahe.2025.06.006
基于生态安全的雅砻江减水河段最小下泄流量保障调度研究
Research on minimum discharge flow protection scheduling strategies in flow-reduced reaches of Yalong River based on ecological security
摘要
Abstract
[Objective]To explore scheduling strategies for ensuring minimum discharge flow in flow-reduced reaches of the Great Bend of the Yalong River,thereby safeguarding aquatic ecosystem health.[Methods]The Mann-Kendall(M-K)test was used to detect non-stationarity in runoff series.A joint probability distribution model was established for mainstream and tributary inflows of the Luning cross-section of the Yalong River using the Copula function to analyze the wet-dry encounter characteristics of mainstream and tributary runoff.Subsequently,a strategy for ensuring minimum discharge flow at the Luning cross-section under inconsistent runoff conditions was proposed.A joint scheduling model for cascade reservoirs was established to analyze schemes for ensuring minimum discharge flow at the Luning cross-section and scheduling strategies for cascade hydropower stations under normal and extremely dry scenarios in the mainstream and tributaries.[Results]The result showed that an abrupt change in runoff occurred at the Jinping-Ⅱ dam site around 1989.Both pre-and post-change periods exhibited low probabilities of wet-dry or dry-wet encounters in mainstream and tributary inflows.Compensation water releases from the Jinping cascade were necessary to maintain minimum discharge flow at the Luning cross-section.Under normal and dry scenarios of mainstream and tributary inflows,Jinping-Ⅱ gate site required additional compensation water releases of 0 to 18.2 m3/s and 11 to 48 m3/s,respectively,beyond the ecological base flow.During intraday no-load operation of the Jinping cascade,the hydraulic connectivity between upstream and downstream reservoirs was leveraged to enhance the regulation capability of Jinping Ⅱ.Joint scheduling of mainstream and tributaries was implemented to achieve the goal of minimum discharge flow at the Luning cross-section.[Conclusion]The M-K method effectively identifies abrupt change points in runoff at the Jinping-Ⅱ dam site.The joint probability distribution model based on Copula function accurately describes the dependency between mainstream and tributary runoff.The proposed scheme for ensuring minimum discharge flow and scheduling schemes for cascade hydropower stations under different scenarios can effectively ensure the minimum discharge flow in flow-reduced reaches of the Great Bend of the Yalong River,thereby preserving aquatic ecosystem health.关键词
丰枯遭遇/Copula函数/梯级水库/最小下泄流量/调度策略/雅砻江/影响因素Key words
wet-dry encounter/Copula function/cascade reservoir/minimum discharge flow/scheduling strategy/Yalong River/influencing factor分类
建筑与水利引用本文复制引用
段瞳,马彪,王天宇..基于生态安全的雅砻江减水河段最小下泄流量保障调度研究[J].水利水电技术（中英文）,2025,56(6):64-76,13.基金项目
国家重点研发计划课题(2021YFC3200303) （2021YFC3200303）
长江勘测规划设计研究有限责任公司自主创新项目(CX2023S034) （CX2023S034）
雅砻江流域水电开发有限公司科研试验项目(000645-22ZB0528/01) （000645-22ZB0528/01）
