长江上游日调节非恒定流对拴疆碛浅滩航道要素的影响  

Daily regulated unsteady flow s influence on channel elements of Shuanjiangqi shoal in the upper Yangtze River

作　　者：秦镭宁 胡江[2] 薛飞龙 QIN Lei-ning;HU Jiang;XUE Fei-long(Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China;National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China;China Railway Changjiang Transportation Design Group Co.,Ltd.,Chongqing 401121,China)

机构地区：[1]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [2]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074 [3]中铁长江交通设计集团有限公司,重庆401121

出　　处：《水运工程》2021年第11期81-86,104,共7页Port & Waterway Engineering

基　　金：国家重点研发计划资助项目(2018YFB1600400)。

摘　　要：向家坝水电站日调节非恒定流与岷江日调节非恒定流在宜宾合江门汇合形成新的非恒定流过程,波长超过200 km,对宜宾—泸州河段(叙泸段)航道滩险的通航要素产生明显影响。采用平面二维非恒定水流数学模型,计算分析代表工况下日调节非恒定流传播规律及其对叙泸段拴疆碛航道要素的影响。结果表明:1)日调节非恒定流自合江门传递到拴疆碛约1.5 h,拴疆碛水位日变幅最大约1.053 m,相较于合江门衰减约30%,且波峰时期水面比降小于波谷时期,拴疆碛卵石滩采砂对非恒定流运动产生明显影响;2)代表性日调节非恒定流过程中,拴疆碛河段满足航道维护标准2.9 m水深的河宽在204~585 m,现有航标设置存在航道边界不满足最小维护水深情况,须对现有航标设置方案进行优化。A new unsteady flow,with a wavelength of more than 200 km,has been formed at Yibin Hejiangmen by the convergence of daily regulated unsteady flow from Xiangjiaba Hydropower Station and Minjiang River,which has a significant impact on the navigation elements of the shoal channel of the Yibin-Luzhou river(Xulu section).A two-dimensional unsteady flow mathematical model is applied to analyze the propagation law of the daily regulated unsteady flow on the channel elements of Shuanjianqi in Xulu section.The results show that:1)It takes about 1.5 hours to transmit the regulated unsteady flow from Hejiangmen to Shuanjiangqi.And the maximum daily variation amplitude of Shuanjiangqi water level is about 1.053 m,which is about 30%lower than Hejiangmen.The water surface gradient in the peak period is lower than that in the trough period.Sand mining in the pebble beach of Shuanjiang has a significant impact on the unsteady flow.2)In the process of representative daily regulated unsteady flow,the river width of Shuanjianqi is 204~585 m that achieves the channel maintenance water depth standard of 2.9 m.Moreover,and the existing navigation mark setting at the channel boundary cannot satisfy the minimum maintenance water depth,so the existing navigation mark setting scheme needs to be optimized.

关 键 词：非恒定流 二维数值模拟 浅滩 航道要素 

分 类 号：TV133.2[水利工程—水力学及河流动力学] U612.1[交通运输工程—船舶及航道工程]