熊家洲新汊道对七弓岭弯道水动力调整的影响

doi:10.11988/ckyyb.20201200

院报 ›› 2022, Vol. 39 ›› Issue (3): 8-12.DOI: 10.11988/ckyyb.20201200

熊家洲新汊道对七弓岭弯道水动力调整的影响

刘亦伦¹, 李志威², 谭岚³, 陈帮⁴, 王赞成³, 姜英豪³

1.湖南省水运建设投资集团有限公司,长沙 410011;
2.武汉大学水资源与水电工程科学国家重点实验室,武汉 430072;
3.湖南百舸水利建设股份有限公司,长沙 410007;
4.长沙理工大学水利与环境工程学院,长沙 410114

收稿日期:2020-11-23 修回日期:2021-02-07 出版日期:2022-03-01 发布日期:2022-03-14
通讯作者: 李志威(1984-),男,湖北云梦人,副教授,博士,主要从事河流动力学研究。E-mail: lizw2003@whu.edu.cn
作者简介:刘亦伦(1994-),男,河南信阳人,硕士,从事水运工程建设管理。E-mail: 191430132@qq.com
基金资助:
湖南省科技重大专项(2018SK1010); 湖南省自然科学基金项目(2020JJ3036) ; 湖南省教育厅重点项目(19A017)

Influence of a Cutoff Channel on Hydrodynamic Adjustment of Qigongling Bend in Xiongjiazhou Reach of Lower Jingjiang River

LIU Yi-lun¹, LI Zhi-wei², TAN Lan³, CHEN Bang⁴, WANG Zan-cheng³, JIANG Ying-hao³

1. Hunan Provincial Water Transportation Construction & Investment Group Co., Ltd., Changsha 410011, China;
2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;
3. Hunan Bestall Water Conservancy Construction Co., Ltd., Changsha 410007, China;
4. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China

Received:2020-11-23 Revised:2021-02-07 Online:2022-03-01 Published:2022-03-14

摘要/Abstract

摘要： 下荆江尾闾的熊家洲河段自1950年斜槽裁弯形成新生汊道分流,使得下游七弓岭弯道水动力发生调整,进而加剧河道崩岸,影响河势稳定。采用水文资料和地形数据,基于MIKE21软件建立熊家洲弯道上下游河段(监利—螺山)的二维水动力数值模型,设置不同来流量和新汊道尺寸,模拟新汊道条件改变对七弓岭弯道水动力调整的影响。研究表明:汊道展宽至分流明显后,主流水动力轴线沿七弓岭弯道的凸岸偏转;当汊道尺寸较大时,汊道出流近似垂直于七弓岭弯道颈口上游河岸,加剧颈口上游未守护河段的崩岸,这为原型观测所证实。

关键词: 弯道, 汊道分流, 水动力调整, 二维水动力数值模型, 下荆江

Abstract: Chute cutoff in Xiongjiazhou reach in the tail of lower Jingjiang River occurred in 1950 and gave rise to a new cutoff channel, resulting in the adjustment of downstream hydrodynamic condition in the Qigongling Bend, which further aggravated bank collapse and weakened channel stability. Based on hydrological data and channel topography, a two-dimensional hydrodynamic model of the Xiongjiazhou reach (Jianli-Luoshan) was constructed using MIKE21 to simulate the influence of the cutoff channel development on the hydrodynamic adjustment under different discharges and branch sizes. Results manifested that widening the branch leads to the increasing of flow diversion, and the flow dynamic axis deflected along the concave bank of Qigongling Bend. Given that the branch size enlarged, the outflow of the diversion flow was roughly perpendicular to the upstream bank at the neck of Qigongling Bend, which aggravated bank collapse of the unprotected river bank on the upstream side. The result was confirmed by in situ field observation.

Key words: river bend, diversion flow, hydrodynamic adjustment, 2D hydrodynamic numerical model, lower Jingjiang River

中图分类号:

TV147.1

刘亦伦, 李志威, 谭岚, 陈帮, 王赞成, 姜英豪. 熊家洲新汊道对七弓岭弯道水动力调整的影响[J]. 院报, 2022, 39(3): 8-12.

LIU Yi-lun, LI Zhi-wei, TAN Lan, CHEN Bang, WANG Zan-cheng, JIANG Ying-hao. Influence of a Cutoff Channel on Hydrodynamic Adjustment of Qigongling Bend in Xiongjiazhou Reach of Lower Jingjiang River[J]. Journal of Yangtze River Scientific Research Institute, 2022, 39(3): 8-12.

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熊家洲新汊道对七弓岭弯道水动力调整的影响

Influence of a Cutoff Channel on Hydrodynamic Adjustment of Qigongling Bend in Xiongjiazhou Reach of Lower Jingjiang River

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