摘要
对杭州湾金山深槽附近两个定点站位的大潮期间同步水文、泥沙观测结果进行了粉砂分布区再悬浮效应的分析,提出了根据再悬浮过程反演底床切应力的新方法。研究结果表明,在强潮动力、高悬沙质量浓度环境下,即使无密度成层性,悬沙质量浓度对底部边界层的影响仍然存在,表现为底部切应力的减小。在这一条件下,如仍然采用卡门-普朗特模型(κ=0.4),则估算的底部切应力将大大高于实际的数值。
In-situ tidal cycle measurements during a spring tide were undertaken at two stations near Jins- han Channel in Hangzhou Bay. The data from the observations were analyzed, to propose a new method of estimating the bed shear stress on the basis of resuspension fluxes. The analytical results indicate that, in intense tidal currents with high suspended sediment concentrations, the effect of sediment resusupension on the benthic boundary layer is significant, with or without density stratification. High suspended sediment concentrations reduce bed shear stress. If the Karmdn-Prandtl model is adopted （with the Karman constant κ being taken as 0.4）, then the shear stress obtained will be highly overestimated.
出处
《海洋科学》
CAS
CSCD
北大核心
2010年第1期52-57,共6页
Marine Sciences
基金
国家自然科学基金重点项目(40231010)
关键词
悬沙质量浓度
再悬浮过程
切应力
潮流边界层
杭州湾
suspended sediment eoncentration
resuspension processes
bed shear stress
benthic boundary layer
Hangzhou Bay
