摘要
黄河四排口河段位于宁夏石嘴山市平罗县境内,原河道为弯道,左岸不断冲刷,主流顶冲堤防,险情不断发生。四排口河段河道整治工程通过建立丁坝、联坝进行截流,并人工开挖引河进行导流。为了对截流后河势发展进行准确预测,利用声学多普勒流速剖面仪(RiverCAT)、激光粒度分析仪等测量仪器监测该河段13个典型横断面,测量每个断面处水深、水位、垂线平均流速、河床高程、悬移质泥沙粒径级配等,对比分析典型断面不同时期左右岸及河宽的变化情况。结果表明:在丁坝的作用下,主槽位置从左岸逐渐向河中心移动,在下游引河处又回归左岸;最大流速则在左右岸不停迁移,且流速变化呈抛物线分布;悬移质中值粒径呈现不规则变化趋势;人工截流后该河段处于不稳定的状态。
Located in the section of Pingluo County,Shizuishan City,Ningxia,the original river channel iscurved shape,the left bank is constantly washed,the head of mainstream impacts the embankment and dangerous situation keeps happening.The river training works Si⁃paikou section was carried out by building spur dikes,joint⁃dam interception and diversion by manual excavation.In order to accurately pre⁃dict the development of the river after interception,the author's project team used the measuring instruments such as the acoustic Doppler flow profiler(RiverCAT)and the laser particle size analyzer to set 13 typical cross sections of the river section and measured the water depth,water level,average vertical velocity of the section,riverbed elevation and gradation of suspended sediment size of each section.It compared and analyzed the changes of the left and right banks and river width of typical sections in different periods.The results show that under the action of the spur dike,the position of the mainstream gradually moves from the left bank to the center of the river,and returns to the left bank at the downstream diversion river;the maximum flow velocity moves continuously on the left and right banks,and the flow ve⁃locity changes present a parabolic distribution;the median diameter presents an irregular trend,indicating that the river is in an unstable state after the artificial cutoff.
作者
张兴凯
李春光
乔桥
吴军涛
刘鑫
景何仿
ZHANG Xingkai;LI Chunguang;QIAO Qiao;WU Juntao;LIU Xin;JING Hefang(Ningxia Water Conservancy and Hydropower Engineering Bureau,Yinchuan 750021,China;School of Civil Engineering,North Minzu University,Yinchuan 750021,China;School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China)
出处
《人民黄河》
CAS
北大核心
2022年第3期48-52,共5页
Yellow River
基金
国家自然科学基金资助项目(11761005,11861003)
宁夏科学技术厅重点研发计划项目(2019BEG03048)
宁夏自然科学基金资助项目(2018A0443,2019AAC03136)
宁夏高等学校科学技术研究项目(NGY2018-140)。
关键词
水情分析
冲淤变化
泥沙粒径分析
四排口河段
黄河宁夏段
water situation analysis
scouring and silting change
sediment particle size analysis
Sipaikou reach
Ningxia reach of Yellow River
作者简介
张兴凯(1966—),男,宁夏同心人,高级工程师,研究方向为工程施工管理;通信作者:李春光(1964—),男,河南正阳人,教授,博士,研究方向为水文学与水资源,E⁃mail:cglizd@hotmail.com。
