长江口细颗粒泥沙密实室内试验研究  

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

作　　者：万远扬[1,2] 陈曦 黄伟[4] 沈淇 

机构地区：[1]上海河口海岸科学研究中心,上海201201 [2]联合国教科文组织-水教育学院 [3]宁波市港航管理局,浙江宁波315041 [4]大连理工大学,辽宁大连116024

出　　处：《水运工程》2013年第11期111-114,共4页Port & Waterway Engineering

基　　金：上海市自然科学基金项目(11ZR1415800);中荷合作伙伴基金项目(RESEDUE;60038881)

摘　　要：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。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.

关 键 词：长江口 细颗粒泥沙 密实速度 沉降筒 

分 类 号：TV145[水利工程—水力学及河流动力学]