分层流风波水槽中基于线阵CCD水面影像反演内孤立波的实验研究  

Experimental study on extracting internal solitary wave in a wind-wave tank of stratified fluid using line array CCD images at the free surface

作　　者：魏岗[1] 王欣隆 陈祥瑞[1] 曾文华[1] 杜辉[1] 李万鹏[1] 

机构地区：[1]解放军理工大学气象海洋学院,南京211101

出　　处：《中国科学：物理学、力学、天文学》2015年第1期99-105,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:11072267;11472307);国家高技术研究发展计划(编号:2008AA09Z316)资助项目

摘　　要：在大型重力式分层流风波水槽系统中,利用风生波原理模拟水面随机小尺度波场,采用重力塌陷方式产生大振幅孤立子内波,通过线阵CCD影像记录其传播过程中引起的水面小尺度波结构变化,分析孤立子内波对水面短重力波及毛细(重力)波的影响规律,建立线阵CCD图像灰度特征与内波要素特征的关系,进而由水面波场变化反演出水下孤立子内波的特征结构.实验结果证实了本文方法的有效性,也为实际利用海面粗糙度及海水层化特性遥感海水内部动力学研究提供了新的途径.According to the principles of wind-generating-wave and gravity fluid trapping-motion at the interface respectively, both the small-scale random surface wave and the large-amplitude internal solitary wave can be generated simultaneously in a large wind-wave tank of stratified fluid. The micro-structure variation of the small-scale wave on the surface of water is recoded continuously on a line array CCD image when an internal solitary wave is propagating under the water, and then its influence to the properties of those surface short gravitational waves and capillary waves is analyzed. So the underwater internal solitary wave can be retrieved by analyzing the weak variation of surface-wave field to establish the relation between the features of internal wave elements and CCD grey levels. The obtained results are shown to verity its effectiveness of this experimental method, and also provide a new avenue for the study on the remote sensing of ocean internal dynamics through the practical utilization of surface roughness and stratification properties.

关 键 词：分层流水槽 孤立子内波 水面粗糙度 线阵CCD影像 

分 类 号：O352[理学—流体力学]