摘要
长江下游泰兴水道的天星洲形成发育于20世纪50年代初期,经历了50年代至70年代末的快速发育阶段,80年代初至90年代末的冲淤调整阶段,及90年代末以来的相对稳定阶段。研究表明:泰兴水道顺直放宽的河段特性以及江岸节点的挑流作用,形成大片缓流区,导致泥沙容易落淤形成水下浅滩,给天星洲的形成发育奠定了重要基础;而上游嘶马弯道20世纪50年代至70年代末的大规模江岸崩退,则给天星洲的快速形成发育提供了充足的泥沙来源。通过深入探讨天星洲的形成主因,分析其历史变迁过程,掌握其演变规律,为本河段的航道整治与岸线开发提供科学依据。
Developed in the early 1950s in the Taixing reach of the Yangtze River,Tianxingzhou central island experienced the rapid development stage from 1950s to 1970s,the scouring and silting adjustment stage from early 1980s to late 1990s,and the stable stage since late 1990s.The formation mechanism and the evolution of this central island is studied to provide reference for the harnessing of the river course and the development of the shore line.This study shows that large slow flow area was formed because of the riverbed broadening in the Taixing reach and the ski jump effect of the bank node,thereby resulting in sediment deposition and underwater shoal,which laid foundation for the formation of Tianxingzhou central island.Whereas the large-scale collapse of the river bank in the upper Sima bend from the early 1950s to late 1970s provided sufficient sediment for the rapid development of Tianxingzhou central island.
出处
《长江科学院院报》
CSCD
北大核心
2011年第8期5-10,共6页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金资助项目(50779037
50879047)
关键词
江心洲
成因
演变过程
崩岸
天星洲
central bar
formation mechanism
evolution
bank collapse
Tianxingzhou central island
