黄河宁夏永丰渡口连续弯曲河段河床稳定性分析  

Stability Analysis of the Continuous Curved Riverbed in Yongfeng Ferry of the Yellow River in Ningxia

作　　者：柳明洋 李春光[1,2] 吕岁菊 乔桥 宋璐璐 LIU Mingyang;LI Chunguang;LYU Suiju;QIAO Qiao;SONG Lulu(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;School of Mathematics and Information Science,North Minzu University,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]北方民族大学数学与信息科学学院,宁夏银川750021 [3]北方民族大学土木工程学院,宁夏银川750021

出　　处：《宁夏工程技术》2023年第2期134-140,147,共8页Ningxia Engineering Technology

基　　金：国家自然科学基金项目(11761005);宁夏自然科学基金项目(2021AAC03037)。

摘　　要：河流连续弯道是大多数自然河流常见的特征,环流是弯道中最常见的要素之一,环流与纵向水流结合在一起,在弯道横断面内指向凹岸螺旋前进,对河流稳定性产生了复杂影响。因此,为研究连续弯曲河流中环流对河流水动力及泥沙输移的影响,利用声学多普勒剖面仪、激光粒度分布仪、GPS-RTK等实验仪器,对黄河宁夏永丰渡口连续弯曲河道水动力学要素进行了比较分析。结果表明:经长期冲淤,河床断面形式与弯道内环流存在关系,环流会构造河床断面的形状,改变水流主流线的方向,使其发生摆动;在连续弯道内,影响含沙量的主要因素是流速,二者呈正相关关系;相比于直线段,弯曲河道稳定性更差,更易发生河床变形。Continuous river bends are a most common feature of most natural rivers.Circulation is one of the most common elements in bends.The combination of circulation and longitudinal flow,which spirals forward toward concave banks within the bend crosssection,has a complex effect on river stability.Therefore,to study the influence of circulation on river hydrodynamics and sediment transport in continuously curved rivers,a comparative analysis of the hydrodynamic elements of the continuously curved river channel at Yongfeng Ferry of the Yellow River in Ningxia was carried out using experimental instruments such as acoustic Doppler profiler,laser particle size distribution instrument and GPS-RTK.The results show that there is a relationship between riverbed cross-section form and circulation in the bend,and the circulation will structure the shape of the riverbed cross-section further,changing the direction of the main streamline and making it oscillate after long-term siltation.The main factor affecting the sand content is the flow velocity in the continuous bend,which is positively correlated.The bend riverbed is less stable and more prone to riverbed deformation compared with the straight section.The research results contribute to providing a basis for the prevention and control of flushing in the continuously curved section of the Yellow River in Ningxia.

关 键 词：弯道环流 黄河 弯曲河流 水沙运动 河床稳定性 

分 类 号：TV85[水利工程—水利水电工程]