长江口深水航道北槽口外悬沙浓度垂向分布

在长江口深长航道北槽，利用“声学悬潲观测系统”观测得到了大潮不同潮时近瞬时高时空分辩率细颗粒悬沙浓度垂直向分布，此外，还观测了流速和和盐度地垂线分布，在涨潮初期，悬沙浓度的垂向分布均均匀，在接近涨憩时，悬沙浓度的梯度小，在落潮时，悬沙浓度随水深水面到水底按指数递增，可视为恒定均匀流中悬潲处于平衡条件的分布，泥沙垂向扩散系数εｓ可用泥沙颗粒沉降速度ωｓ的两倍来近似，在接近落憩时，悬沙浓度的垂向梯度适

Vertical Profile of Suspended Sediment Concentration in the Changjiang Estuary

By using an acoustic suspended sediment monitor,vertical profiles of suspended sediment concentrations,with high temporal and spatial resolution,have been obtained at spring tide in the Changjiang Estuary (North Passage).Measurements have also been made of current velocity and salinity.At flood tide,the vertical profile of suspension concentration is uniform.At high slack water,the vertical gradients in suspension profile are small.At ebb tide,the vertical suspension profile is characterized by an exponential increase from surface to bottom,which is indicative of an equilibrium condition.At low slack water,the vertical gradients of suspension concentration are moderate.Vertical profiles of current velocity and salinity suggest that they are three dimensional.