摘要
利用 Cilas 940L 型激光粒度仪对 1998 年 11 月取自长江河口的 46 个悬浮体样品进行了粒度测试分析。结果表明，长江河口悬浮体粒度特征在空间上具有明显的变化。悬浮体粒度的平均粒径、分选系数、偏态和峰态等参数，以及粉砂和粘土级含量在河口区平面和垂向上的分布的变化都较为显著。悬浮体的粒度分布为非正态分布，表层悬浮体为双峰分布模式，底层悬浮体为双峰或三峰分布模式。重点探讨了长江河口悬浮体粒度变化的影响因素中的表层沉积物的再悬浮作用和悬浮细颗粒絮凝这两个主要的因素。对长江河口表层沉积物的再悬浮通量进行了估算，表明，不同区域的再悬浮作用存在较大的差异，拦门沙地区为主要的再悬浮发生区。
By using the Cilas 940 L type laser grain-size analyzer, 46 suspended particulate matter (SPM) samples are analyzed, which have been collected from the surface and bottom water in the Yangtze Estuary. The results of analysis show that the grain-size parameters and composition of the SPM vary strongly in the horizontal and vertical directions in the Yangtze estuary area. The grain-size distribution pattern of the SPM is in an abnormal (skewed) mode, which shows bimodal distribution mode in the surface water SPM, and trimodal / bimodal mode in the bottom water samples. Furthermore, we have discussed in detail the two main factors affecting the grain-size variation of SPM in the Yangtze estuary area, namely, surface sediment resuspension and flocculation of fine-grained particles. The resuspension fluxes in the different settings of the estuary are calculated in the gross.
出处
《海洋通报》
CAS
CSCD
北大核心
2003年第6期21-29,共9页
Marine Science Bulletin
基金
国家自然科学基金 (编号:40176020)
中国科学院知识创新工程项目"中国主要河口及邻近陆架海域海陆相互作用研究"(编号:KZCX2-207)
