长江口徐六泾洪季水沙特性观测研究

Summer Field Observations of Current and Suspended Sediment Concentration Near Xuliujing, Changjiang Estuary, China

2001 年 7 月，在长江口徐六泾对流速、流向和悬浮泥沙浓度进行了大小潮定点观测。观测数据分析表明徐六泾处大潮流速及其变化远大于小潮流速。大潮悬沙浓度大于小潮悬沙浓度。由于径流的影响，落潮期间垂向速度梯度比涨潮期间大，落潮垂向切变增强，使落潮期间悬沙浓度的变化幅度大于涨潮期间的泥沙变化幅度, 同时存在泥沙浓度峰值滞后于流速峰值的现象。

The State Key Lab of Estuarine and Coastal Research conducted a field experiment to study current and sediment transport in the Estuary during the spring and neap tides of July 2001 near Xuliujing, Changjiang estuary. Current speed, current direction, suspended sediment concentrations and particle size are measured and described. The observation data show that the spring tide current and its variations are much larger than those of the neap tide. The spring tide suspended sediment concentration is bigger than that of the neap tide. The record data show that the sediment concentration is associated with the increase in current velocity because of the strong vertical velocity gradient, i, e., the strong turbulent. The data also indicate that the peak of sediment concentration lags behind the peak of current velocity.