摘要
长江中下游分汊河段众多,且大多分汊河段口门附近存在碍航浅滩,三峡水库蓄水后,水沙条件变异造成下游河段滩槽形态的调整,部分分汊河段浅滩航道条件恶化。本文以嘉鱼—燕子窝河段为例,在总结河床演变特点的基础上,深入分析河床边界与水力输沙条件的相互作用,揭示河床演变的内在机理,在此基础上预测河床演变的趋势,并对已有航道整治工程提出优化建议。
Braided channels exist widely in the middle and lower reaches of the Yangtze River,a great part of these channels are in bad navigation conditions because of the shoals at the entrance of the branches.After the impoundment of the Three Gorges Project,the variations of runoff and sediment load induce the transformation of the downstream shoals,which worsen the navigation condition of some channels.Based on the existing summary of the characteristics of the Jiayu-Yanziwo section,the relationship between river boundary and hydraulic sediment conditions is analyzed,and the mechanism of fluvial processes is revealed.The river evolution tendency and the optimization of the waterway projects are then presented.
出处
《泥沙研究》
CSCD
北大核心
2012年第1期1-6,共6页
Journal of Sediment Research
基金
国家重点基础研究发展计划(973)重大水利工程影响下河口水沙和地貌变化过程(2010CB429002)
关键词
分汊河段
临界流量
趋势预测
航道整治
braided river
critical discharge
trend prediction
waterway regulation
