摘要
荆江与洞庭湖水流在城陵矶汇流河段的水流条件直接影响到上游河段水位变化和洪水传播,关系到荆江河段及洞庭湖的防洪安全,通过长江防洪实体模型试验,分析了不同流量下,荆江与洞庭湖不同汇流比及下游不同水位条件下,江湖汇流处水流特性的变化。研究表明,江湖汇流处水流具有显著的弯道水流特性,两股水流相互顶冲、掺混,流态复杂,水流态势表现出明显的不稳定性。采取措施降低下游水位、合理调度削减洪峰以及避免江湖洪水恶劣遭遇等,可以改善汇流河段水流条件、降低水位,从而有利于上游江湖防洪。
The water flow of both Jingjiang River and Dongting Lake confluence at Chenglingji reach,and the flow features of the confluence reach directly affect the water level variation and flood propagation of upper reach,which is related to the flood control of Yangtze River and Dongting Lake further.We carry out tests with the physical flood control model of Yangtze River under different conditions,including different discharges,flow convergence ratios and downstream water levels.The results show that the flow of the confluence of the river and lake has the significant bend water flow characteristics.They mix with each other at the confluence and become complicated and instable.Therefore,some countermeasures such as lowering the downstream water level,avoiding an unreasonable diversion ratio and rational management to reduce flood peak should be taken to improve the flow features of the confluence reach and benefit the flood control of Yangtze River and Dongting Lake.
出处
《人民长江》
北大核心
2011年第7期43-46,共4页
Yangtze River
关键词
江湖关系
汇流
实体模型
水流特性
防洪
荆江-洞庭湖
relation of river and lake
confluence
physical model
flow features
flood control
Jingjiang River-Dongting Lake
作者简介
唐峰，男，工程师，主要从事河道治理及环境泥沙整治工作。E—mail：helaozi_001@163．com
