三峡水库蓄水后长江中下游典型分汊浅滩河段演变趋势预测.pdf.pdf

第 40卷第 4 期四川大学学报( 工程科学版) Vol. 40 No. 4
2008年 7月 JOURNAL OF SICHUAN UN IVER SITY (ENGINEER ING SC IENCE ED ITION) July 2008
文章编号: 100923087 ( 2008) 0420017208
三峡水库蓄水后长江中下游典型分汊浅滩河段演变趋势预测
张为,李义天,江凌
(武汉大学水资源与水电工程科学国家重点实验室,湖北武汉 430072 )
摘要:汊道兴衰、洲滩的演变与其水沙输移特性密切相关。以沙市典型分汊浅滩河段为例,从河段水沙输移特性
出发,结合水流泥沙、河道地形等实测资料,分析其河床演变特点,并根据三峡建库后水沙条件变化的特点利用数
学模型预测了该河段的汊道和洲滩发展趋势。研究表明:所建模型能够准确地模拟该河段的水沙输移特性及洲滩
的演变规律,因而具有较好的预测功能,三峡水库蓄水后河段洲滩动态变化结果与实测结果较吻合,这对三峡水库
蓄水运用后其它分汊浅滩河段的研究具有借鉴意义。
关键词:三峡;分汊;浅滩;河床演变;数值模拟
中图分类号: TV147 文献标识码: A
Fluvia l Process Change of the Typ ica lM ulti2Bran ched M eander ing Rea ch
in the M id2D own Yangtze R iver After Three Gorges Dam Im poun dm en t
ZHANG Wei, L I Yi2tian, J IANG L ing
( State Key Lab. ofW ater R esources and Hydropower Eng. Sci. , Wuhan Univ. , Hubei 430072, Ch ina)
Abstrac t: The rise and decline of bra ided reach and the fluvial process of continent and shoal a re c losely rela ted to
the cha racte ristics of hydraulic and sediment transport. The paper focuse s on the Sha shi reach, a typ ical multi2
branched meandering reach in the m iddle Yangtze R iver. F irstly, based on a large amountof fie ld da ta, the evolu2
tion feature of this reach is analyzed in natural condition. Then, according to the effect of Three Gorge Project
( TGP) on flow and sediment process, the trend of geomorphology change is predicted. Finally, based on