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对钱塘江中沉积物粒度的研究，前人多关注横剖面的粒度变化.为了解钱塘江沉积物粒度在流向上的变化特征，在下沙段（下沙大桥至江东大桥）进行粒度采样，对含泥砂悬浮物样品和砂泥样品的粒度进行分析.结果表明，粒度在1.45〜3 500 µm，属粘土至砾组分，以粉砂组分占比最多；粒径均值为3.24〜5.92 µm，位于粉砂至极细砂范围；粒度频率呈多峰分布，分选差至分选非常差，峰度为非常尖峰至宽峰.在该区间的直流河段粒度特征相似，而在下沙大桥河流弯曲的凸岸处粒度特征不同.反映该处水动力条件复杂，可能同时受到层流和紊流的影响.最大水流分量在下沙大桥凸岸处最小，在直流河段随流向逐渐减小.粒度和最大水流分量特征受钱塘江下沙段河流形态控制.