摘要
为研究长江宜昌至大埠街段砂卵石河床疏浚对航槽动力环境的影响,采用基于非结构网格的二维水流模型,充分考虑下游沙质河床水位下降溯源作用,分析出口水位下降与疏浚共同影响下的航槽内水流动力特征变化。结果表明,在河床保持稳定的前提下,下游沙质河段水位下降2 m,水位下降向上传递沿程递减,至陈二口处水位降幅降至0.004 m,至宜昌水位降幅降至0.001 m以内,比降的影响表现为局部比降增大,增大区域主要集中在姚港以下;疏浚能提升航道水深,缓解航槽内的坡陡现象,但也会降低沿程河段的水位控制强度,下游水位下降2 m结合疏浚后,水位下降0.004 m将上延至周家河,宜昌水位降幅将增大至0.002 m。研究成果可为长江干线砂卵石河段航道尺度提升、航道维护等提供技术支撑。
In order to study the impact of dredging on channel dynamics in the Yichang to Dabujie section of the Yan-gtze River,two-dimensional flow model of the unstructured grid was used to analyze the change of hydrodynamic charac-teristics under the action of outlet water level dropping and dredging,considering the downstream water level decline effect to the upstream.The result shows that on the stable river,when the downstream sandy river water level decreases by 2 m,the effect of the falling water level on the upstream decreases gradually,it decreases 0.004 m at Chenerkou,and 0.001 m at Yichang.The gradient of partially area is increasing,the main affect area is belowing Yaogang;The dredging can en-hance the depth of the channel and alleviate the steep slope in the channel,but the water level control capability are re-duced;When the water level decreased by 2 m and dredging,the water level decreases 0.004 m to Zhoujiahe,water level drop in Yichang increases to 0.002 m.This results can provide technical support for the channel scale upgrading and channel maintenance to gravel sand reach of the Yangtze River.
作者
余文钧
王江
YU Wen-jun;WANG Jiang(Changjiang Waterway Survey Design and Research Institute(Wuhan)Co.,LTD.,Wuhan 430010,China)
出处
《水电能源科学》
北大核心
2024年第4期192-196,共5页
Water Resources and Power
关键词
砂卵石河段
疏浚
水位
航道
gravel sand reach
dredging
water level
channel
