| 三峡水库泄水-蓄水过程香溪河库湾水流振荡特性 |
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| 引用本文： | 徐慧,龙良红,纪道斌,杨忠勇,杨正健,刘德富,汤正阳.三峡水库泄水-蓄水过程香溪河库湾水流振荡特性[J].水科学进展,2022,33(2):264-273. |
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| 作者姓名： | 徐慧 龙良红 纪道斌 杨忠勇 杨正健 刘德富 汤正阳 |
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| 作者单位： | 1.三峡大学水利与环境学院，湖北 宜昌 443002 |
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| 基金项目： | 国家自然科学基金资助项目U2040220国家自然科学基金资助项目52079069 |
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| 摘 要： | 深入认识水库的水动力过程一直是研究和解决其水环境问题的基础。通过对三峡水库香溪河库湾2019年泄水期(5月)和蓄水期(9月)高频、连续的水位和流速剖面监测数据进行分析，获得了该支流库湾振荡的物理特性。研究发现:①高频的库湾振荡在垂向上表现为正压波，在水平模态上表现为最基本的Helmholtz模式(n=0)，该振荡是香溪河库湾显著存在的重要水动力过程之一; ②库湾振荡的周期约2 h，在库湾上游其振荡流速可达±0.05~0.1 m/s，水位波动振幅可达0.2 m; ③支流库湾振荡由库区干流重力波驱动，重力波产生于大坝下泄流量的日调节过程。本研究不仅加深了对水库及其支流水动力过程的认识，同时也进一步揭示了香溪河库湾水动力过程对三峡水库日调度的响应机制，为后续水库生态调度研究及其应用提供了新的视角。
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| 关 键 词： | 水流振荡 水位波动 水动力 水库调度 三峡水库 |
| 收稿时间： | 2021-05-20 |
Study on characteristic of the flow oscillation in release and filling periods in the Xiangxi tributary of Three Gorges Reservoir |
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| Affiliation: | 1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China2.Hubei Field Observation and Scientific Research Stations for Water Ecosystem in Three Gorges Reservoir, China Three Gorges University, Yichang 443002, China3.Hubei Key Laboratory of River-Lake Ecological Restoration and Algal Utilization, Hubei University of Technology, Wuhan 430068, China4.China Three Gorges Corporation, Beijing 100038, China |
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| Abstract: | Understanding hydrodynamic process is key to study and improve the environment problems in reservoirs. Based on high-frequency field monitoring of flow and water level in the Xiangxi Bay (XXB) of the Three Gorges Reservoir(TGR) during release period (May 2019) and filling period (September 2019), the characteristics of flow oscillation in XXB are analyzed. The results are as follows. ① The barotropic flow oscillation with fundamental Helmholtz mode is a universal hydrodynamic process in the TGR. ② This oscillation has a period of nearly 2 h, causes strong periodic flows with an amplitude up to ±0.05—0.1 m/s and periodic water level fluctuation with an amplitude up to 0.2 m at the upstream of Xiangxi Bay. ③ The tributary oscillation is driven by the gravity wave at the mouth of tributary, which is induced by the diurnal discharge operation of TGR. This study further reveals the response mechanism of the hydrodynamics in a tributary bay to the discharge operation in TGR. It also provides a new perspective for the future basic and applied research in the reservoir operation. |
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