闽江河口洪季悬浮泥沙特征及输运过程  

Suspended sediment characteristics and transport in the Minjiang estuary during flood seasons

作　　者：李东义[1] 陈坚[1] 王爱军[1] 余兴光[1] 

机构地区：[1]海洋与海岸地质环境开放实验室国家海洋局第三海洋研究所,福建厦门361005

出　　处：《海洋工程》2009年第2期70-80,共11页The Ocean Engineering

基　　金：福建省科技计划重大专项前期研究项目(2005YZ1013);国家自然科学基金资助项目(40876043)

摘　　要：根据2007年闽江河口两个站位洪季大潮的同步观测资料,分析了闽江河口潮周期内悬浮泥沙的分布特征、底质再悬浮特征以及悬浮泥沙的输运过程和机制。研究表明:闽江河口悬浮泥沙粒级组成上以粉砂为主,分选较差,粒级偏向粗颗粒一侧,单峰分布;梅花水道悬浮泥沙浓度波动较大,再悬浮作用明显;第一个潮周期内涨潮流在输运过程中的作用更为明显,平均流、斯托克斯漂移效应、潮汐捕集作用和垂向潮振荡引起的剪切扩散是引起闽江河口悬浮泥沙输运的重要因素。Simultaneous anchored observation at two stations in the Minjiang estuary was carried out during spring tide in the flood season in 2007. The observation results show that the suspended sediment is mainly composed of fine silt, with a poorly sorted, positively skewed, sin- gle-mode pattern in grain size distribution. The suspended sediment concentration remarkably fluctuates in the Meihua channel, and it may be closely relates to sediment resuspension. The flood tide current plays a more important role in the suspended sediment transport in the first tide cycle. Advection, storks drift, tidal trapping and vertical sheafing diffusion are the most important factors in the transport of the suspended sediment in Minjiang estuary.

关 键 词：闽江河口 悬浮泥沙 再悬浮 悬沙输运 

分 类 号：TV148[水利工程—水力学及河流动力学]