水利水电技术（中英文）2025，Vol.56Issue(8)：131-148,18.DOI:10.13928/j.cnki.wrahe.2025.08.010
赣江尾闾多级分汊河道水动力空间优化研究
Study on hydrodynamic spatial optimization of multi-level branched channels in Ganjiang River estuary
摘要
Abstract
[Objective]The issues of navigation obstruction and ecological degradation are caused by uneven hydrodynamic distribution in the river section of the Ganjiang River estuary.To address these,the optimization of flow diversion ratios after the impoundment operation of the Nanchang Hydraulic Hub is quantitatively analyzed,thereby improving the uneven hydrodynamic distribution in the river section of the estuary.[Methods]Based on hydrodynamic numerical simulation,a two-dimensional hydrodynamic model of the river section of Ganjiang River estuary was established.The hydrodynamic response characteristics were simulated under four operating conditions of historical flow diversion ratios from 1983 to 2018 when the hub impoundment raised the water level at Waizhou station to 15.5 m.The flow velocity variation patterns in each channel were analyzed.Combining navigation requirements,ecological flow demands,flow velocity requirements,and the flow capacity of each branch in the river section of the estuary,multi-objective constraints for water allocation were defined.The Max-Min criterion(maximization of minimum velocity method)was applied to optimize the flow diversion ratios.[Results]The result showed that after the hub impoundment,when the flow at Waizhou station was less than or equal to 2 000 m3/s,the water level difference between Waizhou and the downstream gates of each branch remained within 0.5 m,with smaller differences observed at lower flow rates.Under the optimized flow diversion ratio scheme,when the flow rate at Waizhou station was 500 m3/s,the minimum flow velocity in each branch increased by over 18.9％compared to the four historical flow diversion schemes.At 1 000 m3/s,the lower limit of flow velocity increased by more than 12.3％.At 2 000 m3/s,the lower limit of flow velocity in each branch increased by more than 15.4％,maintaining velocities within the range of 0.16 to 0.19 m/s and avoiding extreme flow velocity differences caused by other flow diversion ratio schemes.When the flow reached 4 000 m3/s,the upper limit of flow velocity reduced,keeping the velocities of all branches below 0.46 m/s,thereby alleviating the scouring of riverbeds caused by high flow velocity compared to other schemes.[Conclusion]Flow regulation via the Nanchang Hub effectively improves the uneven hydrodynamic characteristics among the branches.While meeting the basic ecological and navigation requirements of each branch,this regulation raises the lower limit of flow velocity,controls the upper limit,and addresses the issue of seasonal flow interruptions in the branches,thereby providing a decision-making basis for multi-objective coordinated water resource scheduling.关键词
赣江尾闾/数值模拟/多级分汊河道/多目标优化/水动力/鄱阳湖Key words
Ganjiang River estuary/numerical simulation/multi-level branched channels/multi-objective optimization/hydrodynamics/Poyang Lake分类
建筑与水利引用本文复制引用
张新铭,唐立模,万扬,游文荪,王志超..赣江尾闾多级分汊河道水动力空间优化研究[J].水利水电技术（中英文）,2025,56(8):131-148,18.基金项目
国家重点研发计划项目"长江中下游平原河网区水动力优化再构与自然动能高效利用"(2022YFC3202603) （2022YFC3202603）
江西省水利厅科技项目"入湖多级分汊河道多目标流量动态调控技术研发与应用"(202325ZDKT04) （202325ZDKT04）
