海气界面沫滴悬浮层的特征  

The Characteristics of the Droplets Suspension Layer at Air-Sea Interface

作　　者：晁国芳 管长龙[1] 

机构地区：[1]中国海洋大学物理海洋教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第4期1-6,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41276010);教育部博士点专项基金项目(20130132130002)资助~~

摘　　要：Makin利用经典的有限饱和沫滴悬浮层理论建立了高风速下的海面动力学粗糙度模型。本文基于Makin模型,研究了海面拖曳系数随风速变化关系对沫滴悬浮层厚度、沫滴极限下落速度和Charnock参数的依赖性,从而考察了沫滴悬浮层的特征,并根据观测数据确定一些参数的取值。结果表明:沫滴悬浮层高度对拖曳系数随风速变化关系影响甚微;沫滴极限下落速度对拖曳系数随风速变化关系影响较大,但由不同观测数据估计得到的沫滴极限下落速度趋于一致;Charnock参数对拖曳系数随风速变化关系影响较大。综上,基于Makin模型的拖曳系数随风速变化关系主要依赖于Charnock参数。最后,利用已有的理论研究结果及通过数据拟合给出了解析的拖曳系数随风速变化关系式,仅依赖于Charnock参数,适用于各种风速情形。Makin（2005） established the sea surface roughness length model under high wind condition using the classical theory of the suspension layer in the regime of limiting saturation. Based on this mod- el, this paper discuss.es different estimations for the height of the suspension layer, the terminal velocity of the droplets and the Charnock parameter to analyze the dependence of Makings model on these param eters and explore the characteristics of the droplets suspension layer. Simultaneously, we attempt to de- termine the evaluation for certain parameters. Results show that the height of the suspension layer has nearly no effect on the correlation between drag coefficient and wind speed while the terminal velocity of the droplets and the Charnoek parameterhave a significant influence on the correlation. However, esti- mations based on different observations reveal a tiny fluctuation range for the terminal velocity of the droplets. In conclusion, the dependencyof drag coefficient on wind speedbased on Makin＇s model relies onthe Charnock parameter. On account of pre-existing theoretical research and data fitting results, an analytical form for the dependencyof drag coefficient on wind speed is derived. It merely relies on the Charnock parameterand may apply to low to extreme wind speeds.

关 键 词：高风速 拖曳系数 沫滴悬浮层 沫滴极限下落速度 

分 类 号：P731.2[天文地球—海洋科学]