黄河小北干流河段持续淤积期深泓摆动特点及影响因素  

Characteristics and Influencing Factors of Thalweg Migration in the Xiaobeiganliu Reach of the Yellow River During the Period of Continuous Channel Aggradation

作　　者：李洁 夏军强[2] 朱呈浩[3] LI Jie;XIA Junqiang;ZHU Chenghao(College of Hydraulic Science and Engineering,Y angzhou University,Yangzhou 225009,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]黄河勘测规划设计研究院有限公司,河南郑州450003

出　　处：《应用基础与工程科学学报》2022年第4期883-892,共10页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(52109102);水资源与水电工程科学国家重点实验室开放研究基金项目(2020HLG01)。

摘　　要：黄河小北干流河床横向摆动剧烈,研究其深泓摆动特点及影响因素对认识游荡型河流河床演变规律和河道整治规划具有重要意义.本文基于小北干流河段持续淤积期25个断面汛后实测地形资料,研究了该河段深泓摆动方向和摆动宽度的变化特点,并定量揭示了来水来沙条件、下游侵蚀基准面及河床边界条件对深泓摆动强度的影响作用.研究结果表明:小北干流河段深泓摆动方向具有往复性,摆动宽度沿程差异较大,龙门-庙前河段深泓摆动宽度大于中段和下段;上游前期4a平均含沙量和下游潼关高程的变化是影响小北干流河段持续淤积期深泓摆动强度的关键因子;建立了小北干流河段深泓摆动强度的经验公式并进行验证,用公式得到的计算值与实测值的变化趋势基本吻合.The Xiaobeiganliu reach of the Yellow River is famous for severe channel migration, so it is significant to investigate the characteristics and influencing factors of thalweg migration, which can help to understand the law of channel evolution and to make the planning of river regulation in this reach.The characteristics of the thalweg migration direction and the thalweg migration width were investigated based on the observed post-flood cross-sectional profiles at 25 sections during the period of continuous channel aggradation.The effects of the incoming flow and sediment regime, the downstream basis level of erosion and channel boundary conditions on the reach-scale thalweg migration intensity were quantitatively revealed.It is found that thalweg migration directions were reciprocating, and thalweg migration widths varied significantly along the Xiaobeiganliu reach.The thalweg migration widths in the reach between Longmen and Miaoqian were larger than those in the middle and lower reaches.The previous four-year average incoming sediment concentration and the variation in the Tongguan elevation were the two key factors influencing the thalweg migration intensity during the period of continuous channel aggradation in the Xiaobeiganliu reach.An empirical equation was established to calculate the reach-scale thalweg migration intensity, and the calculated data using this equation agreed well with the observed data.

关 键 词：深泓摆动 水沙条件 潼关高程 河床边界条件 小北干流 黄河中游 

分 类 号：TV147[水利工程—水力学及河流动力学]