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。
Changjiang estuary,Turbidity Maximum,Tidal Current,Scouring Force,Sediments concentration 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 ofgenerating the turbidity maximum.The turbidity maximum is characterized by high sedimentsconcentration and high flocculation rates.Under strong tidal current bottom sediments are mas-sively resuspended,strengthening sediments transprotation.The excursion area of the turbiditymaximum approximately consists with the mouth bar area.The present study has practical mean-ing in furthering our knowledge of the generation and evolution of the mouth bars.
出处
《地理研究》
CSSCI
CSCD
北大核心
1994年第1期51-59,共9页
Geographical Research
基金
国家自然科学基金
