| 纪道斌,周哲轩,杨忠勇,龙良红,王耀耀.三峡出库流量日调节模式驱动的重力波问题[J].水利学报,2021,52(1):111-119 |
| 三峡出库流量日调节模式驱动的重力波问题 |
| Study on the gravity wave induced by the diurnal variation of outflow discharge in the Three Gorges Reservoir |
| 投稿时间：2020-06-08 修订日期：2020-10-26 |
| DOI：10.13243/j.cnki.slxb.20200407 |
| 中文关键词: 三峡水库 流量调节 重力波 沿程传播 |
| 英文关键词: Three Gorges Reservoir outflow discharge fluctuation gravity wave wave propagation in a res- ervoir |
| 基金项目:国家自然科学基金项目（91647207，52079069，51779128，51879099）；国家留学基金委访问学者项目 |
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| 中文摘要: |
| 受三峡电站昼夜发电负荷不均的影响，三峡出库流量呈显著的日调节模式，驱动坝前水位以重力波形式在库区传播，对水库水动力特征产生着影响，但针对该重力波的生成和传播机理仍待研究。文中基于2018年1-10月三峡水库的出入库流量和库区多个站点上的水位等实测资料，分析了日调节模式下三峡水库坝前重力波的生成机理及其在库区430 km范围内的传播特征。主要研究结论包括：（1）坝前日调节重力波生成时，其振幅与昼夜下泄水量差成正比，与库区背景水位成反比，文中给出了相应的坝前水位振幅估算公式；（2）在河道底摩擦、断面形状沿程变化、干支流入流等多方面因素影响下，日调节重力波在坝前430 km范围内，其振幅呈现先减小后增大的趋势，其滞后相位沿程逐渐增加，且振幅和相位沿程变化特征受库区背景水位影响显著。 |
| 英文摘要: |
| Diurnal variation of water level has been observed in Three Gorges Reservoir (TGR), which is driven by the outflow discharge fluctuation, and would travel toward upstream along TGR as a gravity wave. The mechanism of generation and propagation along the reservoir is still unclear. To study the genera- tion mechanism and propagation process of this gravity wave, the field data of discharge and water level during January and October, 2018 was analyzed with methods of wavelet transform and filter analysis. The main results included:(1) the amplitudes of diurnal wave were proportional to accumulated discharge,and inverse proportional to background water level,which can be evaluated by a formula derived in this paper; (2) The wave amplitude experienced a decrease-increase process, while the phase increased gradually, in the process of upstream travelling, under the influence of bottom friction, transverse section, discharge from branches,as well as background water level. |
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