The effect of a seasonal stratification variation on the load exerted by internal solitary waves on a cylindrical pile  

作　　者：CAI Shuqun XU Jiexin CHEN Zhiwu XIE Jieshuo DENG Xiaodong LV Haibin 

机构地区：[1]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Acta Oceanologica Sinica》2014年第7期21-26,共6页海洋学报（英文版）

基　　金：The Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA11020201;the National Basic Research Program of China under contract Nos 2011CB013701 and 2013CB956101;the National Natural Science Foundation of China(NSFC)under contract No.41025019;the Knowledge Innovation Program of the Chinese Academy of Sciences under contract No.SQ201302;LTO Independent Research Program under contract No.LTOZZ1304

摘　　要：On the basis of Morison＇s empirical formula and modal separation method in estimating the force and torque exerted by internal solitary waves （ISWs） on a cylindrical pile, it is found that the loads exerted by the ISWs change largely in different seasons at the same site of the continental shelf in the South China Sea （SCS） even under the condition that the amplitudes of ISWs are the same. Thus, the effect of a seasonal water stratification variation on the force and torque exerted by the ISWs is investigated, and a three-parameter stratification model is employed. It is shown that the loads exerted by the ISWs depend largely on the wa- ter stratification. The stronger the water stratification, the larger the force and the torque; when the depth where the maximum thermocline appears is deepened, the force decreases but the torque increases; when the width of the thermocline is narrowed, the force increases but the torque decreases. The seasonal varia- tion of the force and the torque exerted by the ISWs in four seasons in the SCS is thus explained. Key words： internal solitary waves, force, torque, water stratification, South China SeaOn the basis of Morison＇s empirical formula and modal separation method in estimating the force and torque exerted by internal solitary waves （ISWs） on a cylindrical pile, it is found that the loads exerted by the ISWs change largely in different seasons at the same site of the continental shelf in the South China Sea （SCS） even under the condition that the amplitudes of ISWs are the same. Thus, the effect of a seasonal water stratification variation on the force and torque exerted by the ISWs is investigated, and a three-parameter stratification model is employed. It is shown that the loads exerted by the ISWs depend largely on the wa- ter stratification. The stronger the water stratification, the larger the force and the torque; when the depth where the maximum thermocline appears is deepened, the force decreases but the torque increases; when the width of the thermocline is narrowed, the force increases but the torque decreases. The seasonal varia- tion of the force and the torque exerted by the ISWs in four seasons in the SCS is thus explained. Key words： internal solitary waves, force, torque, water stratification, South China Sea

关 键 词：internal solitary waves force TORQUE water stratification South China Sea 

分 类 号：P752[天文地球—海洋科学]