论文部分内容阅读
根据1982年4月－1983年3月长江口南槽3个站位全年逐月大潮的水化学成分、悬沙粒度与粘土矿物资料，1984－1992年在环形水槽中获得的近百个组次的动水絮凝沉降试验研究资料，以及长江口细颗粒泥沙、浮泥与底质研究成果，对拦门沙形成过程及其机理进行综合研究。结果表明，长江口拦门沙为最年轻的活动三角洲，汛期集中输水输沙与台湾暖流同期相遇，为动水絮凝沉降最强和浮泥最为发育时期；涨潮期当盐度为（9－13）x10－3时，伊利石、高岭石在盐水楔顶部发生动水絮凝沉降，而落潮期当盐度在（19—24）X10－3时，蒙脱石在盐水楔尾部发生动水絮凝沉降，揭示了拦门沙水平淤积的基本规律；半月周期的浮泥透镜体所残积的中、粗粉沙形成钻孔中常见的透镜体与薄层理，则揭示了拦门沙的垂直加积的基本规律，为拦门沙综合治理与深水航道的开发利用提供科学依据。
According to the monthly chemical composition, suspended sediment size and clay mineral data of 3 stations in the south channel of the Changjiang Estuary between April 1982 and March 1983, nearly 100 groups obtained in the annular flume during 1984-1992 Times hydrodynamic flocculation and sedimentation test research data, as well as the results of fine sediment, floating mud and sediment in the Yangtze River estuary, to study the formation process and mechanism of barrier sand comprehensive research. The results show that the sand bar is the youngest activity delta at the mouth of the Yangtze River. The concentrated water transport and sediment transport in flood season meets Taiwan’s warm current in the same period, which is the strongest sediment flocculation and the most developed period of floating mud. When the salinity is (9- 13) x10-3, the illite and kaolinite flocculate and settle on the top of the salt wedge, and the dynamic change of water occurs at the tail of the salt wedge when the salinity is at (19-24) X10-3 Flocculation and sedimentation, revealing the basic rules of the barbed sand sedimentation level; half a month of floating mud lens residue in the middle and coarse silt sand borehole formation of common lens body and thin layering, revealing the sand bar vertical The basic rules of accretion provide a scientific basis for the comprehensive management of barren and sand and the development and utilization of the deepwater channel.