地理科学 ›› 1985, Vol. 5 ›› Issue (1): 79-85.doi: 10.13249/j.cnki.sgs.1985.01.79

• 研究报道 • 上一篇    下一篇

长江葛洲坝河段汊道的形成与演变

孙仲明   

  1. 中国科学院地理研究所
  • 出版日期:1985-01-20 发布日期:1985-01-20

THE FORMATION AND EVOLUTION OF THE BRANCH CHANNELS IN GEZHOUBA REACH OF THE YANGTZE RIVER

Sun Zhongming   

  1. Institute of Geography, Academia Sinica
  • Online:1985-01-20 Published:1985-01-20

摘要: 长江葛洲坝河段位于三峡的出口,宜昌市境内。它是长江规模最大的水利枢纽工程所在地。葛洲坝河段上下变化急剧,具有河床展宽、汉道增多、深槽反坡、河道急转及河势不顺等复杂的河流地貌特点。为了配合葛洲坝工程区的河势规划,我们受长江流域规划办公室的委讬,先后在该区进行了野外勘察和室内分析。本文主要阐述该河段的河谷、河床特征,形成与演变中的问题。

Abstract: The Gezhouba reach ran out of the Sanxia Gorge and developed on an alluvial fan which was restricted by the rock hills of both banks,representing some complex features of fluvial geomorphology, such as channel widening or branching, main current abruptly turning and unconsequently running. The channel widenin5 seems to relate to the unequal rising of neotectonics and the differential erosion on various lithological characters for long time.The trend that the channel moves to right bank during the river evolution process and the fact that the main current near the convex bank now obviously indicated the relation ship between the evolution and unequal tilting of neotectonics, the extension of Hwangbai River alluvial fan and the flow deflecting caused by Hengliangzi. Since A.D.500 the situation that ErJiang and Sanjiang branches have had no water in dry seasons has been formed. At present, the two branches are still in declining stage.