长江安庆河段鹅眉洲汊道近期演变特性及水动力响应分析

潘茂太; 栾华龙; 仇威; 徐芳

doi:10.11988/ckyyb.20250054

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raybet体育在线院报 ›› 2026, Vol. 43 ›› Issue (2) : 1-8. DOI: 10.11988/ckyyb.20250054

河湖保护与治理

长江安庆河段鹅眉洲汊道近期演变特性及水动力响应分析

潘茂太 ¹ ,
栾华龙 ²^,³ ,
仇威 ²^,³ ,
徐芳 ⁴

作者信息 +

Recent Evolution Characteristics and Hydrodynamic Response of Emeizhou Braided Channel in Anqing Section of Yangtze River

PAN Mao-tai ¹ ,
LUAN Hua-long ²^,³ ,
QIU Wei ²^,³ ,
XU Fang ⁴

Author information +

文章历史 +

摘要

安庆下段鹅眉洲汊道位于长江下游,目前安庆段分汊河道河床冲淤变化仍较大,分流比变化具有一定周期性。为研究新水沙情势下左汊分流比变化和主航道条件的稳定性,以及左汊马窝一带涉水工程近期可能因汊道汇流段近岸河床淤积而带来的影响,结合平面二维水动力模型,采用最新原型观测资料跟踪分析了鹅眉洲汊道的周期性演变特征、影响因素和水流特性,并对未来安庆河段治理方向提出了建议。结果表明:鹅眉洲汊道段近几十年来,除鹅眉洲分流点和右汊头部附近以及中汊局部河段外,深泓摆动幅度整体较小,河势保持相对稳定状态。三峡蓄水运用后,鹅眉洲汊道左汊累计略有冲刷,右汊未来一段时间内将保持萎缩趋势。汊道水流特性数值模拟结果表明,1998—2006年中汊快速发展,流速增加,主流向右岸鹅眉洲摆动,左汊、右汊流速略有减小;2006—2021年,受河(航)道工程的导控作用,鹅眉洲汊道分流比基本稳定,中汊发展速度减缓,流速的变化主要集中在中汊下段。建议今后密切关注已有安庆河段治理工程的实施效果,必要时根据河道演变采取相关工程治理措施。

Abstract

[Objective] The Emeizhou braided channel in the lower section of Anqing is situated in the lower reaches of the Yangtze River. Due to the significant variations in scouring and silting in the braided channel of the Anqing section, the variations in diversion ratio exhibit certain periodicity under the new water-sediment regime. This study aims to investigate the variations in the diversion ratio of the left branch and the stability of the main navigation channel conditions under the new water-sediment regime, as well as the potential impacts on water-related projects in the Mawo area of the left branch that may arise from near-bank siltation at the confluence of the braided channels in the near future. [Methods] By integrating a two-dimensional hydrodynamic model and utilizing the latest field observation data on water and sediment, this study tracked and analyzed the periodic evolution characteristics, influencing factors, and flow characteristics of this braided channel. Additionally, recommendations for the future management direction of the Anqing section were proposed. [Results] In recent decades, the thalweg swing amplitude in the Emeizhou braided channel was relatively small overall, and the river regime remained relatively stable, except for areas near the diversion point of Emeizhou, the head of the right branch, and certain localized river sections of the middle branch. After the impoundment of the Three Gorges Reservoir, the left branch of Emeizhou has experienced slight scouring, while the right branch was expected to maintain a shrinking trend for some time. Numerical simulation results of the flow characteristics of the braided channel showed that from 1998 to 2006, the middle branch developed rapidly, characterized by increased flow velocity and a shift of the main flow towards the Emeizhou on the right bank, while the flow velocities in the left and right branches decreased slightly. From 2006 to 2021, under the guidance and regulation of river (navigation) channel engineering, the diversion ratio of the Emeizhou braided channel remained basically stable, the development of the middle branch slowed down, and changes in flow velocity were mainly concentrated in the lower section of the middle branch. [Conclusion] We recommend to closely monitor the effectiveness of the existing river regulation projects in the Anqing section and to implement relevant measures when necessary.

导出引用

潘茂太, 栾华龙, 仇威, 等. 长江安庆河段鹅眉洲汊道近期演变特性及水动力响应分析[J]. raybet体育在线院报. 2026, 43(2): 1-8 https://doi.org/10.11988/ckyyb.20250054

PAN Mao-tai, LUAN Hua-long, QIU Wei, et al. Recent Evolution Characteristics and Hydrodynamic Response of Emeizhou Braided Channel in Anqing Section of Yangtze River[J]. Journal of Changjiang River Scientific Research Institute. 2026, 43(2): 1-8 https://doi.org/10.11988/ckyyb.20250054

中图分类号： TV147

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