长江口细颗粒泥沙密实室内试验研究*

细颗粒泥沙密实速度问题是认识细颗粒动力过程重要的参数之一，也是决定地貌学数学模型表现能力的核心参 数。利用“大型可温控自动搅拌沉降试验筒”及音叉密度仪等，对3种取自长江口的原状沙样进行了密实过程试验，并分别 利用密度计法和迈克劳林公式计算了密实速度。通过对比发现:密度计法计算过程简化太多，不宜采用；迈克劳林公式物理 意义较强，适合作为密实速度计算公式。试验成果发现泥沙粒径是影响密实速度的重要影响因子，长江口细颗粒泥沙密实 速度大致为0.31×10-3~4.8×10-3 mm/s。

Experimental study on the consolidation velocity of fine sediment in the Yangtze estuary

For coastal and estuarine morphdynamics, consolidation of fine sediment is of crucial importance for us to understand its influence on sediment dynamics process. Based on a new settling column and the DensiTune, three series of consolidation experiments are carried out, the difference between those series is the median grain size, all the sediment samples are collected originally from the Yangtze estuary. Two methods, the density method and the McLaughlin method, are employed to calculate the consolidation velocity. Experiments have shown that the flocculation becomes weaker when sediment size increases, and we find that the grain size is a significant impact for fine sediment consolidation. According to careful analysis and comparison, the consolidation velocity of fine sediment in the Yangtze estuary is in the range of 0.31×10-3~4.8×10-3 mm/s.