摘要
在充分认识传统沉降筒缺陷的基础上提出了＂大型可温控自动搅拌沉降试验筒＂。通过室内系列试验发现：（1）含沙量对长江口细颗粒沉降速度影响最大;（2）温度上升,沉速增加,但不同阶段影响程度有所不同;（3）含沙量越高,盐度对沉速的影响越小,含沙量相同情况下,长江口北槽悬沙枯季水温下盐度对沉速的影响在1.8~5.7倍左右;洪季水温下盐度对沉速的影响在1.5~2.2倍左右。（4）枯季最佳絮凝盐度在7左右,最佳絮凝含沙量为7 kg/m3;洪季最佳絮凝盐度在10~12左右,最佳絮凝含沙量为4.5kg/m3。本研究成果可望加深我们对细颗粒泥沙动力过程相关机理的认识,同时可为相关港口、航道的淤积机理分析,数学模型、物理模型研究工作提供一定技术参考。
For the coastal sedimentology, especially for those fine sediment estuaries, settling velocity is a critical parameter that is of significant importance for us to understand their behavior and dynamics. Based on the well known drawbacks and short comings of the traditional settling column, a new apparatus has been developed for measuring the settling velocity of fine suspended sediment in laboratory. In this study, we found that not only sus-pended sediment concentration but also salinity and temperature could significantly influence the settling velocity, and finally an empirical formula was proposed based on a series of experiments. This study may help improve our understanding on this topic and favor numerical modelling on fine sediment.
出处
《海洋科学》
CAS
CSCD
北大核心
2015年第8期78-85,共8页
Marine Sciences
基金
国家科技支撑计划(2013BAB12B03)
国家自然科学基金(41206072)
关键词
长江口
细颗粒泥沙
沉降速度
沉降筒
the Yangtze River Estuary
fine sediment
settling velocity
settling column
