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ZHANG Yanmin,ZHANG Jie,WANG Yunhua,MENG Junmin,ZHANG Xi. 2015. The damping model for sea waves covered by oil films of a finite thickness. Acta Oceanologica Sinica, 34(9):71-77
The damping model for sea waves covered by oil films of a finite thickness
一定厚度的油膜对海浪的抑制模型研究
Received:August 18, 2014  Revised:November 26, 2014
DOI:10.1007/s13131-015-0729-1
Key words:sea surface wave  oil film of finite thickness  damping ratio
中文关键词:  海浪、一定厚度的油膜  抑制比
基金项目:
Author NameAffiliationE-mail
ZHANG Yanmin The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China 
 
ZHANG Jie The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
WANG Yunhua College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China yunhuawang@ouc.edu.cn 
MENG Junmin The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
ZHANG Xi The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
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Abstract:
      In combination with a wave action balance equation, a damping model for sea waves covered by oil films of a finite thickness is proposed. The damping model is not only related to the physical parameters of the oil film, but also related to environment parameters. Meanwhile, the parametric analyses have been also conducted to understand the sensitivity of the damping model to these parameters. And numerical simulations demonstrate that a kinematic viscosity, a surface/interfacial elasticity, a thickness, and a fractional filling factor cause more significant effects on a damping ratio than the other physical parameters of the oil film. From the simulation it is also found that the influences induced by a wind speed and a wind direction are also remarkable. On the other hand, for a thick emulsified oil film, the damping effect on the radar signal induced by the reduction of an effective dielectric constant should also be taken into account. The simulated results are compared with the damping ratio evaluated by the 15 ENVISAT ASAR images acquired during the Gulf of Mexico oil spill accident.
中文摘要:
      本文结合海浪谱的作用量平衡方程,给出了一定厚度油膜对海浪的抑制模型,该模型不仅与油膜的物理参数有关,而且与环境参数有关。文中开展了抑制比对这些参数的敏感性分析,数值模拟结果表明:动力学粘性,表面/界面弹性、油膜厚度、油膜覆盖率等参数对抑制比的影响较大,但油膜的其他物理学参数如:密度、表面/界面张力,表面/界面粘度几乎对抑制比不产生影响;而且,文中还发现风速和风向对抑制比的影响较大。一般情况下,油膜对雷达回波信号的抑制,只需考虑油膜对海浪的抑制作用;但对厚乳化溢油而言,还应考虑到介电常数的减小对雷达回波信号的抑制。将本文建立的抑制比模型所得结果与墨西哥湾溢油事故期间的15景ENVISAR ASAR影像所得抑制比结果进行了比较。
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