Theoretical study of the effect of topographic height and width on generation of internal tides

作     者：曹安州 吕咸青 苗春葆 

作者机构：Laboratory of Physical OceanographyOcean University of China 

出 版 物：《Chinese Journal of Oceanology and Limnology》 (中国海洋湖沼学报（英文版）)

年 卷 期：2014年第32卷第6期

页      面：1421-1434页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0908[农学-水产] 0707[理学-海洋科学] 0815[工学-水利工程] 

基　　金：Supported by the National Natural Science Foundation of China(No.41371496) the National High Technology Research and Development Program of China(863 Program)(No.2013AA122803) the Fundamental Research Funds for the Central Universities(Nos.201262007,201362033) 

主　　题：地形高度 潮汐发电 宽度 斜压模式 无量纲参数 速度场 垂直结构 地形坡度 

摘      要：Internal tides generated upon two-dimensional Gaussian topographies of different sizes and steepness are investigated theoretically in a numerical methodology.Compared with previous theoretical works,this model is not restricted by weak topography,but provides an opportunity to examine the influence of topography.Ten typical cases are studied using different values of height and/or width of topography.By analyzing the baroclinic velocity fields,as well as their first eight baroclinic modes,it is found that the magnitude of baroclinic velocity increases and the vertical structure becomes increasingly complex as height increases or width decreases.However,when both height and width vary,while parameter s(the ratio of the topographic slope to the characteristic slope of the internal wave ray) remains invariant,the final pattern is influenced primarily by width.The conversion rate is studied and the results indicate that width determines where the conversion rate reaches a peak,and where it is positive or negative,whereas height affects only the magnitude.High and narrow topography is considerably more beneficial to converting energy from barotropic to baroclinic fields than low and wide topography.Furthermore,parameter s,which is an important non-dimensional parameter for internal tide generation,is not the sole parameter by which the baroclinic velocity fields and conversion rate are determined.