持续冲刷期内黄河下游河床演变特点分析  

Characteristics of channel adjustment in Lower Yellow River during continuously scouring period

作　　者：高璐 徐向舟[1] 张红武[2] GAO Lu;XU Xiangzhou;ZHANG Hongwu(School of Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]大连理工大学水利工程学院,辽宁大连116024 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水利水电科技进展》2024年第3期73-79,共7页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金项目(52379060);国家重点研发计划项目(2016YFC0402504)。

摘　　要：基于2006年10月至2018年11月黄河下游12个典型断面观测数据,通过分析断面主槽平滩形态特征参数变化率及深泓线和主槽中心线的摆动强度,探讨了持续冲刷期内下游河床的调整变化过程及特点。结果表明:黄河下游断面形态调整表现出既有横向展宽又有冲深下切或淤高态势;河床平面摆动促进了断面主槽形态调整,河相系数变化率与深泓线和主槽中心线摆动强度均成正相关关系;来水来沙条件是主槽形态改变的主要驱动力,且可引起局部河段深泓线摆动强度增大。通过调整小浪底水库的运行模式及布设控导工程可进一步塑造并维持稳定的黄河下游中水河槽。Based on the data of 12 representative cross-sections in the Lower Yellow River from October 2006 to November 2018,the adjustment process and characteristics of downstream riverbeds during the continuously scouring period is investigated by analyzing the variation rates of the morphology characteristic parameters of the main channel and the migration intensity of the thalweg and the centerline.The results show that the morphological adjustment of the Lower Yellow River has exhibited a diversity with both lateral widening and vertical scouring or depositing in recent years.The riverbed migration has promoted the adjustment of the cross-sectional morphology of the main channel.The rate of change in cross-sectional geomorphic coefficient was positively correlated with the migration intensity of the thalweg and the main channel centerline.Furthermore,water-sediment condition is the main contributor to the changes in the main channel morphology,causing an increase in the migration intensity of the thalweg in local reach.Hence,a stable medium-size river channel of the Lower Yellow River will be further shaped and maintained when the operation mode of the Xiaolangdi Reservoir is adjusted and the reasonable river control work is established.

关 键 词：黄河下游 河床冲刷 主槽断面形态 平面形态 水沙变化 

分 类 号：TV147.3[水利工程—水力学及河流动力学]