地形强迫对西边界流的影响探究实验  

An Experimental Study on the Influence of Topographic Forcing on Western Boundary Current

作　　者：宋雨薇 孟帅 曹勇 陈旭[1,2] 孟静 SONG Yu-wei;MENG Shuai;CAO Yong;CHEN Xu;MENG Jing(College of Oceanic and Atmospheric Science,Ocean University of China,Qingdao 266100,China;National Oceanography Experimental Teaching Demonstration Center,Ocean University of China,Qingdao 266100,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]中国海洋大学海洋学国家级实验教学示范中心,山东青岛266100

出　　处：《气体物理》2019年第6期56-62,共7页Physics of Gases

基　　金：国家自然科学基金(J1310013)

摘　　要：文章实验旨在利用实验室转台、常角度倾斜斜面、圆柱形障碍物以及水泵来模拟西边界流和海底地形.利用PIV粒子图像测速技术探究表层流场,并讨论当地形障碍物位于不同位置时,西边界流的流态变化及能量分布情况,进而探究流域中涡旋的产生位置、传播路径和涡周期.实验结果表明正压条件下入侵西边界流的地形障碍物能够在其下游产生涡动能较大的流动并可认为是黑潮延伸体模型,并且由于此流动具有强烈的不稳定性,有非定常涡旋在此产生并传播;另外,不同位置的地形障碍物也可能导致西边界流分叉,产生回流流涡,进而使得西边界流流量以及能量分布发生变化.The purpose of this experiment is to simulate the western boundary current and sea floor topography by using the laboratory turntable,the sloping surface with constant angle,the cylindrical obstacles and the water pump.The particle image velocimetry technology was used to explore the surface flow field.The flow pattern and energy distribution of the western boundary flow model were discussed when the local obstacles were located at different positions of the western boundary current,so as to explore the generation position,propagation path and life span of the eddies.The experimental results show that in a barotropic mode,the topographic obstacles invading the western boundary flow can generate flow with large eddy kinetic energy downstream and can be considered as the Kuroshio extension.Furthermore,unsteady eddies are generated and then propagate due to the strong instability of the flow.In addition,terrain obstacles can also lead to the bifurcation of the western boundary current and generate reflux vortexes,which will change the flow and energy flux distribution of the western boundary current.

关 键 词：西边界流 地形强迫 相对涡度 涡动能 体积输运 

分 类 号：P731.27[天文地球—海洋科学]