| LI Qun,XU Zhenhua,YIN Baoshu,BAI Tao,LIU Kun,WANG Yang.Modeling the interaction of an internal solitary wave with a sill[J].Acta Oceanologica Sinica,2015,34(11):32-37 |
| 内孤立波与海脊相互作用的模拟研究 |
| Modeling the interaction of an internal solitary wave with a sill |
| 投稿时间：2015-03-19 修订日期：2015-06-14 |
| DOI：10.1007/s13131-015-0745-1 |
| 中文关键词: |
| 英文关键词:internal solitary wave nonhydrostatic model wave breaking blocking degree |
| 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. |
| 作者 | 单位 | E-mail | | 李群 | 中国极地研究中心, 上海 200136, 中国 | | | 徐振华 | 中国科学院海洋研究所, 青岛 266071, 中国
中国科学院海洋环流与波动重点实验室, 青岛 266071, 中国 | xuzhenhua@qdio.ac.cn | | 尹宝树 | 中国科学院海洋研究所, 青岛 266071, 中国
中国科学院海洋环流与波动重点实验室, 青岛 266071, 中国 | | | 白涛 | 国家海洋局北海预报中心, 青岛 266033, 中国 | | | 刘昆 | 中国科学院海洋研究所, 青岛 266071, 中国
中国科学院海洋环流与波动重点实验室, 青岛 266071, 中国
中国科学院大学, 北京 100049, 中国 | | | 王洋 | 中国科学院海洋研究所, 青岛 266071, 中国
中国科学院海洋环流与波动重点实验室, 青岛 266071, 中国
中国科学院大学, 北京 100049, 中国 | |
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| 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. |
| 英文摘要: |
| 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. |
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