湖泊科学2024，Vol.36Issue(4)：1220-1231,12.DOI:10.18307/2024.0452
汉江兴隆水利枢纽下游近坝河段枯水位下降及成因分析
Analysis of the low water level decline and its causes in the downstream section of Han-jiang River Xinglong Water Control Project near the dam
摘要
Abstract
After the operation of the Xinglong Water Control Project at Hanjiang River,the low water level near the downstream of the dam has significantly decreased compared to that before the construction of the dam.Under a flow rate of 500-800 m3/s,the cumulative water level under the dam has decreased by 2.47-2.55 m in 2021 compared to that before the operation.Such water lev-el decrease had adverse effects on the safety and efficiency of the Hydro-junction.Based on the observation data of hydrology,cross section and underwater topography,the causes of low water level decline were analyzed.The results showed a limited sediment re-tention of the Xinglong Water Control Project.Reduction of sediment flux throug Huangzhuang was an important factor enhancing ri-verbed erosion below Xinglong.The decrease in the probability of dry water reaching the beach during the year caused by high water level regulation,the channel regulation and protection engineering were critical factors of"beach sedimentation and channel ero-sion"in the process of strong erosion.The direct reasons for the decrease of dry water level in the Xinglong near dam section were the erosion of the low water channel downstream of the dam and the decrease in the lowest water level in Hankou.The random forest algorithm analysis showed that the most critical factor affecting the changes in water level under Xinglong Dam was the sharp de-crease of sediment flux at Xinglong Station.In addition,the waterway regulation project and the boundary conditions of the riverbed also played a critical role in the decrease of low water level.The riverbed composition at the Xinglong Dam site and downstream rea-ches was relatively fine.Although the riverbed was severely eroded from 2012 to 2022,there was no coarsening of the sediment composition.Therefore,it was expected that the riverbed will continue to be eroded and cut down.The low water level has not yet reached a stable state.关键词
汉江/兴隆水利枢纽/河床冲刷/枯水位下降/随机森林Key words
Hanjiang River/Xinglong Water Control Project/river bed erosion/lowering of low water level/random forest引用本文复制引用
陈柯兵,高玉磊,朱玲玲,由星莹,樊咏阳,邓乐乐..汉江兴隆水利枢纽下游近坝河段枯水位下降及成因分析[J].湖泊科学,2024,36(4):1220-1231,12.基金项目
国家重点研发计划项目(2023YFC3209502)、湖北省水利重点科研项目(HBSLKY202327)和国家自然科学基金长江水科学研究联合基金项目(U2240206)联合资助. （2023YFC3209502）
