摘要
为了从根本上消除游荡性河段带来的防洪威胁,2018年黄河上游石嘴山河段实施了一次人工裁弯,裁弯后新开挖的引河的河床和河势发生了显著的变化。基于实测数据分析了人工裁弯后引河的基本演变规律,并采用实测资料和MIKE3水动力模型,建立三维水动力模型,分析了引河的平面流场特征和纵向流速分布,研究了入口流量对上述的影响。研究表明,人工裁弯后,引河的河床演变随着来水来沙的变化而发生了变化,包括河床冲刷下切和崩岸加剧。引河入口处的流速分布受丁坝群的影响出现了回流区,对丁坝的围堰产生了较大的威胁。随着引河入口流量的增大,左右岸的滩地均被淹没,且左岸被淹没的面积大于右岸。为保证人工裁弯的维持,防止出现倒灌现象,应在引河的中下游左岸处开展护岸措施。
In order to fundamentally eliminate the threat of flood control brought by the wandering channel,an artificial cutoff was implement⁃ed in the Shizuishan reach of the Upper Yellow River in 2018.After the artificial cutoff,the riverbed and river situation of the newly excavat⁃ed diversion river changed significantly.Based on the measured data,the primary controlling factors of morphodynamics of diversion river af⁃ter artificial cutoff is analyzed.The 3D hydrodynamic model of the diversion river based on the measured data and the MIKE3 hydrodynamic model is built.The effects of inlet flow on the flow field characteristics and longitudinal velocity distribution of the diversion river are studied.The study shows that the riverbed evolution of the diversion river changes with the change of water and sand after the artificial cutoff,includ⁃ing the erosion of the riverbed and the intensification of bank collapse.The recirculation zone appears at the entrance of the diversion river,which poses a greater threat to the cofferdam of the spur dike.With the increase in the inlet discharge of the diversion river,the beach on the left and right banks is submerged,and the submerged area of the left bank is more than that of the right bank.In order to ensure the success of artificial cutoff and prevent the phenomenon of backwater,bank protection measures should be carried out on the left bank of the middle and low reaches of the diversion river.
作者
张兴凯
景何仿
乔桥
李春光
ZHANG Xing-kai;JING He-fang;QIAO Qiao;LI Chun-guang(Ningxia Water Conservancy and Hydropower Engineering Bureau,Yinchuan 750021,Ningxia,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,Ningxia,China;Department of Architecture,Lvliang University,Lvliang 033400,Shaanxi Province,China;School of Mathematics and Information Science,North Minzu University,Yinchuan 750021,Ningxia,China)
出处
《中国农村水利水电》
北大核心
2023年第5期56-62,共7页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(11861003)
北方民族大学科学计算与工程应用创新团队(2022PT_S02)。
关键词
人工裁弯
引河
石嘴山河段
冲刷
回流区
artificial cutoff
diversion river
Shizuishan reach
erosion
recirculation zone
