内孤立波对同反向传播的表面波的调制特征研究  

Study on the Modulation Characteristics of Internal Solitary Waves for Surface Waves Propagating in Different Backdirection

作　　者：林一帆 徐滔 贾村 陈旭 Lin Yifan;Xu Tao;Jia Cun;Chen Xu(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;Ocean Dynamic Laboratory,Ministry of Natural Resources,the Third Institute of Oceanography,Xiamen 361005,China)

机构地区：[1]中国海洋大学海洋与大气学院,山东青岛266100 [2]自然资源部第三海洋研究所海洋动力研究室,福建厦门361005

出　　处：《中国海洋大学学报（自然科学版）》2025年第1期1-12,共12页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(41876015);国家重点研究发展计划项目(2021YFC3101603)资助。

摘　　要：当内孤立波在海洋内部传播时,会引起表层水体的辐聚辐散,从而对海表波浪进行调制作用。本文使用计算流体力学(Computational fluid dynamics,CFD)技术,针对内孤立波对表面波的调制问题进行数值模拟研究。建立两层模型,模拟了表面波在同反向传播的情况下,不同振幅内孤立波对不同波长表面波的调制过程。基于表面波的波长和波高这两个基本特征,发现内孤立波引起的表层水平流速变化会调制表面波的波高,相同方向传播时,表面波波高会在最大水平流速附近处减小,而相反传播时会增大。同时内孤立波引起的水体辐聚辐散(水平流速梯度)的分布会调制表面波的波长特征,表面波波长会在流场辐散的区域变长,在流场辐聚的区域变短。表面波受调制作用变化的强弱与内孤立波振幅、表面波初始波长相关。内孤立波振幅的增加会加强调制作用,使得表面波波高与波长的变化程度更显著。表面波初始波长增加会减弱调制作用。本研究着重分析了内孤立波对表面波的调制作用,得到了内孤立波引起的上层水体流动和受调制的表面波具体的对应关系与变化规律,有助于更好地理解内孤立波对表面波调制的水动力过程,对于解读内波成像的过程有重要意义。When the internal solitary wave propagates in the ocean,it will cause the convergence and divergence of the surface water,which will modulate the sea surface waves.In this paper,the Computational Fluid Dynamics(CFD)technology is used to study the numerical simulation of surface wave modulation by internal solitary waves.A two-layer model is established to simulate the modulation process of surface waves with different wavelengths and isolated waves in different amplitudes under the same backpropagation.Based on the two basic characteristics of surface wave wavelength and wave height,it is found that the surface wave height induced by internal solitary wave will modulate the surface wave height.When propagating in the same direction,the surface wave height will decrease near the maximum horizontal velocity,but increase when propagating in the opposite direction.At the same time,the distribution of water convergence divergence(horizontal velocity gradient)caused by internal solitary waves will modulate the wavelength characteristics of surface waves,and the surface wave length will become longer in the area of flow field divergence and shorter in the area of flow field convergence.The intensity of surface wave changes under the action of modulation is related to the amplitude of internal solitary wave and the initial wavelength of surface wave.The increase of the amplitude of the internal solitary wave will strengthen the modulation effect and make the surface wave height and wavelength change more significantly.The modulation effect is weakened by increasing the initial wavelength of surface wave.This study focuses on the analysis of the modulation effect of internal solitary waves on surface waves,and obtains the specific correspondence and variation law of the upper water flow caused by internal solitary waves and the modulated surface waves,which is of great significance for understanding the hydrodynamic process of the modulation of internal solitary waves to surface waves,and helps to better interpret the pro

关 键 词：内孤立波 表面波 数值模拟 计算流体力学 小波分析 

分 类 号：P731.24[天文地球—海洋科学]