摘要
荆江三口是联系长江与洞庭湖的纽带,其分流分沙的变化反映了江湖水沙的变化.本文通过实测资料分析了近年来荆江与洞庭湖水沙输移变化规律及其变化原因;采用一维河网数学模型定量给出各因素对三口分流变化的影响.结果表明,受自然因素和人为因素的影响,荆江-洞庭湖江湖水沙输移有了较大调整变化,主要表现为三口分流分沙大幅度减小,干流水沙输移增加;江湖关系变化的主要因素是三口分流道的淤积萎缩和荆江裁弯.这些变化将影响整个长江中游防洪形势,且随三峡工程运行作进一步调整.
The three outfalls are the tie which connects the Yangtze River and Dongting Lake. And the variation of runoff and sediment diverted from these outfalls reflects the variation of the water-sediment in the Yangtze River and Dongting Lake. Based on the field data, the laws and causes of the water-sediment transport are studied in this paper. And it has given the effects of the all factors on the runoff by 1 D river networks mathematical model. Due to the natural and artificial influences, the water-sediment transport has greatly changed. It is characterized by marked decrease in runoff and sediment diverted from these outfalls and increase in water-sediment transport of main stream. The key factors causing these changes are aggradation of the three outfalls channels and Jingjiang river cutoff work. These changes will make an impact on flood control situation of middle and lower Yangtze River and will be adjusted as operation of the Three-Gorges Project.
出处
《水利水运工程学报》
CSCD
北大核心
2008年第3期22-28,共7页
Hydro-Science and Engineering
基金
国家重大基础研究计划(973)项目(2003CD415203)
关键词
荆江三口
分流分沙
水沙输移
一维河网数学模型
Jingjiang three outfalls
diversion of flow and sediment
water-sediment transport
1 D river networks
