摘要
冲积河流深泓线的演变对河流河势、河床地貌具有重要意义。为探明小浪底水库建成后来水来沙条件改变对黄河下游河道深泓线演变的影响,基于2002—2014年花园口、孙口和泺口断面汛后实测地形资料,对比分析黄河下游深泓线位置的变化趋势及其与来沙系数的关系。结果表明:2002—2014年花园口断面深泓迁移强度最大,孙口次之,泺口最小;随着花园口来沙系数的增大,花园口、孙口和泺口断面深泓迁移强度均表现出先减小后增大的趋势,转折点出现在来沙系数为0.004~0.006时,而3个断面中花园口深泓迁移强度对来沙系数的变化最为敏感,且洪季来沙系数变化对深泓迁移强度变化起主导作用。小浪底水库的蓄水拦沙作用使得黄河下游来沙系数减小,改变了主河槽淤积萎缩的演变趋势,同时也有利于河道主流的稳定。
In alluvial river systems, the evolution of thalweg is of great importance to the river regime and morphology.In order to explore the impacts of new water-sediment conditions on the thalweg evolution of the lower Yellow River after the completion of the Xiaolangdi Reservoir, the variation trend of the position of the thalweg of the Yellow River and its relationship with the incoming sediment coefficient were analyzed based on the measured terrain data of Huayuankou, Sunkou and Luokou cross-sections during the period of 2002-2014. The results show that the migration intensity of Huayuankou cross-section is the largest, followed by Sunkou cross-section and Luokou cross-section is the smallest;with the increase of incoming sediment coefficient from Huayuankou, the thalweg migration intensity of the three cross-sections decrease first and then increase, and the turning points appear when the incoming sediment coefficient is 0.004-0.006. Moreover, the migration intensity of Huayuankou cross-section is the most sensitive to the change of incoming sediment coefficient among the three cross-sections, and the incoming sediment coefficient in the flood season plays a leading role in the change of the thalweg migration intensity. The sediment interception of the Xiaolangdi Reservoir results in the decrease of the incoming sediment coefficient, which changes the evolution trend of siltation and shrinkage of the main channel and is conducive to the stability of the main channel in the lower Yellow River.
作者
王建伟
陈炳瑞
段连强
陈泰霖
WANG Jianwei;CHEN Bingrui;DUAN Lianqiang;CHEN Tailin(Cangzhou Water Supply and Drainage Group Co.,Ltd.,Cangzhou 061000,China;Cangzhou Water Conservancy Survey and Design Institute,Cangzhou 061001,China;North China University of Water Resources and Electric Power,Zhengzhou 450011,China)
出处
《人民黄河》
CAS
北大核心
2022年第5期57-60,66,共5页
Yellow River
基金
国家自然科学基金资助项目(51004049)。
关键词
小浪底水库
深泓线
迁移强度
来沙系数
黄河下游
Xiaolangdi Reservoir
thalweg
migration intensity
incoming sediment coefficient
Lower Yellow River
