【摘要】 利用声学悬沙浓度剖面仪(AcP-1)和Endeco流速仪、双频测深仪等对长江口南港底沙再悬浮的浓度、流速和盐度、水深等进行连续14h定点同步观测.对长江口南港底沙再悬浮特征及其影响因子进行综合分析,结果表明:转流阶段再悬浮频率较小,强度较大;涨(落)急阶段,再悬浮频率较大,强度较小;过渡阶段,再悬浮频率和强度随流速同相变化;底沙再悬浮浓度的主要影响因子是盐度、流速、水深和悬沙粒径.再悬浮浓度与流速、盐度、水深和悬沙粒径的线性回归关系显著,相关系数达0.91,且流速、水深和粒径与之呈正相关,盐度与之呈负相关.更多还原

【Abstract】 Measurements of suspended sediment concentration, salinity, water depth, grain size in the bottom, current velocity at 1 m under water surface were made at two fixed stations in the South Channel of the Yangtze Estuary. And the records of viewed near-bed turbulent burst, bed-sediment ejection with a continuous time scale of 14 hours were obtained by Acoustics Suspended Concentration Sediment Profiler ( ACP). The features of the bed-sediment resuspension in each phrase of tide are analyzed. The results show that salinity, velocity, water depth and grain size are chief contributor of bed-sediment resuspension. There is a siginificant linear correlation between re-suspension concentration and salinity, velocity, water depth, grain size of suspend sediment. The linear correlation coefficient is 0.91.更多还原