海表外强迫效应对连续层化流体中先驱内孤立波生成的影响  

The Influence of External Forcing Effect on the Generation of Precursor Internal Solitary Waves in Continuously Stratified Fluids

作　　者：张静华 江文胜 Zhang Jinghua;Jiang Wensheng(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Tianjin Research Institute for Water Transport Engineering,Ministry of Transport,Tianjin 300456,China;The Key Laboratory of Physical Oceanography,Ministry of Education,College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266100 [2]交通运输部天津水运工程科学研究院,天津300456 [3]中国海洋大学海洋与大气学院物理海洋教育部重点实验室,山东青岛266100 [4]青岛海洋科学与技术试点国家实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2023年第3期1-12,共12页Periodical of Ocean University of China

基　　金：国家自然科学基金-山东省联合基金项目(U2106204)资助。

摘　　要：移动的海面或海底强迫在共振条件下会向强迫上游周期性地生成内孤立波,这种内孤立波被称为先驱内孤立波。本文利用三维全非线性、全频散的非静力模型NHWAVE,模拟连续分层流体受到海面外强迫作用而产生的先驱内孤立波,研究了正负外强迫效应对先驱内孤立波生成过程和形态特征的影响。结果显示,负效应强迫作用下先驱内孤立波具有更长的生成周期,这与两层流体中的结论相同;在强迫区内部,正效应强迫使水体的等密度面维持较稳定的结构,而当强迫效应为负时,强迫区内水体的等密度面随时间起伏较大。在正负两种效应强迫作用下,流场均维持了逆时针的回流结构,不过在负效应强迫作用下,流场更为复杂。Precursor internal solitary wave is a phenomenon in which internal solitary waves are perio-dically generated upstream of the external force,stimulated by a moving disturbance from water surface or seafloor as well as the resonance condition is satisfied.This paper uses a three-dimensional,fully nonlinear,full-dispersion non-hydrostatic model NHWAVE to simulate precursor internal solitary waves caused by external surface force in the continuously stratified fluid under the resonance effect.The influence of the external forcing effect is studied.The results show that the precursor internal solitary waves have a longer generation period under the forcing of the negative impact,which is the same as the conclusion in the two-layer fluid.Within the forcing area,the isopycnals maintain relatively stable structures under the positive effect forcing and fluctuate significantly over time under negative effect forcing.The flow field basically maintains a counterclockwise backflow structure,but it is more complicated when the external force is of negative effect.

关 键 词：先驱内孤立波 共振效应 连续层结 水面强迫 

分 类 号：P731.24[天文地球—海洋科学]