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LI Qun,XU Zhenhua,YIN Baoshu,BAI Tao,LIU Kun,WANG Yang. 2015. Modeling the interaction of an internal solitary wave with a sill. Acta Oceanologica Sinica, 34(11):32-37
Modeling the interaction of an internal solitary wave with a sill
内孤立波与海脊相互作用的模拟研究
Received:March 19, 2015  Revised:June 14, 2015
DOI:10.1007/s13131-015-0745-1
Key words:internal solitary wave  nonhydrostatic model  wave breaking  blocking degree
中文关键词:  
基金项目:The National Natural Science Foundation of China under contract Nos 41528601 and 41376029; the Youth Innovation Promotion Association of Chinese Academy of Sciences under contract No. Y4KY07103L, the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11020101.
Author NameAffiliationE-mail
LI Qun Polar Research Institute of China, Shanghai 200136, China  
XU Zhenhua Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China 
xuzhenhua@qdio.ac.cn 
YIN Baoshu Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China 
 
BAI Tao North China Sea Marine Forecasting Center of State Oceanic Administration, Qingdao 266033, China  
LIU Kun Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
WANG Yang Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Key Laboratory of Ocean Circulation and Waves (KLOCAW), Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100049, China 
 
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Abstract:
      A nonhydrostatic numerical model was developed and numerical experiments performed on the interaction of an internal solitary wave (ISW) with a sill, for a two-layer fluid with a diffusive interface. Based on the blocking parameter (Br), the flow was classified into three cases: (1) when bottom topography has little influence on the propagation and spatial structure of the ISW (Br<0.5), (2) where the ISW is distorted significantly by the blocking effect of the topography (though no wave breaking occurs, (0.5< Br <0.7), and (3) where the ISW is broken as it encounters and passes over the bottom topography (0.7<Br). The numerical results obtained here are consistent with those obtained in laboratory experiments. The breaking process of the incident ISW when Br≈0.7 was completely reproduced. Dissipation rate was linearly related to the blocking parameter when Br<0.7, and the maximum dissipation rate could reach about 34% as Br raised to about 1.0. After that, instead of breaking, more reflection happened. Similarly, breaking induced mixing was also most effective during Br around 1.0, and can be up to 0.16.
中文摘要:
      本研究采用一个非静压的数值模型来研究二层流体下内孤立波与海脊的相互作用过程.流体根据阻塞参数的大小可以分为三种情形:(1)当参数小于0.5时,地形对内孤立波的传播和空间结构影响较小;(2)当参数介于0.5和0.7之间时,受到地形的阻塞效应,内孤立波显著变形但没有破碎;(3)当参数大于0.7时,内孤立波遇到和经过底地形时发生破碎.数值模拟结果与其他实验结果取得很好一致.阻塞参数约等于0.7时内孤立波的破碎过程得到了很好的呈现.在参数小于0.7时,内孤立波耗散率与阻塞参数呈线性关系,当参数达到1.0时,耗散率取得最大值约34%,而参数大于1.0时,内波会发生更多的反射而不是破碎.在参数位于1.0左右时,破碎引发的混合效率最为显著,最高可达到0.16.
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