地理研究 ›› 1994, Vol. 13 ›› Issue (1): 51-59.doi: 10.11821/yj1994010007

• 论文 • 上一篇    下一篇

长江河口最大浑浊带的泥沙特性和输移规律*

李九发, 时伟荣, 沈焕庭   

  1. 华东师范大学河口海岸研究所
  • 收稿日期:1992-10-15 修回日期:1993-10-28 出版日期:1994-03-15 发布日期:1994-03-15
  • 基金资助:
    * 国家自然科学基金项目系列研究成果之一(9487005)

SEDIMENT PROPERTIES AND TRANSPROTATION IN THE TURBIDITY MAXIMUM IN CHANGJIANG ESTUARY

Li Jiufa, Shi weirong, Shen Huanting   

  1. East China Normal University Institute of Estuarine and Coastal Research
  • Received:1992-10-15 Revised:1993-10-28 Online:1994-03-15 Published:1994-03-15

摘要: 本文通过对不同河段的泥沙特性和输移规律的对比分析,确认长江河口来沙丰富,在河口潮流不对称和重力环流的作用下,大量泥沙向滞流点辐聚,形成最大浑浊带。最大浑浊带含沙量高,泥沙絮凝沉速快。潮流强劲,引起床沙再悬浮,输沙能力强。长江河口最大浑浊带活动区与河口拦门沙位置基本一致。本研究成果对于加深认识河口拦门沙的成因和变化,以及航槽治理具有重大的现实间义。

关键词: 长江河口, 最大浑浊带, 潮流, 挟沙能力, 含沙量

Abstract: By comparing the sediment properties and transporting laws in different branches of the Changjiang estuary,it is concluded that sediment input in the estuary is in tremendous quantity.The asymmetry in tidal ebb and flood currents and the gravitational circulation are the majormechanisms of concentrating sediments around the null Eularian residual current point and of generating the turbidity maximum.The turbidity maximum is characterized by high sedimentsconcentration and high flocculation rates.Under strong tidal current bottom sediments are massively resuspended,strengthening sediments transprotation.The excursion area of the turbiditymaximum approximately consists with the mouth bar area.The present study has practical meaning in furthering our knowledge of the generation and evolution of the mouth bars.

Key words: Changjiang estuary, Turbidity Maximum, Tidal Current, Scouring Force, Sediments concentration

PACS: 

  • P737