南海北部流花海域海流特征分析——基于2013年冬季流花海域潜标ADCP资料  

Analysis of current characteristics in Liuhua area in northern South China Sea:based on the mooring ADCP data in the winter of 2013

作　　者：吴海京[1] 闫庆勋[1] 王爱梅[2] 于洋[1] 朱友生 李强 徐如彦[4] WU Haijing YAN Qingxun WANG Aimei YY Yang ZHU Yousheng LI Qiang XU Ruyan(COSL,Tianjin 300459,China National Marine Data and Information Service,Tianjin 300171,China CNOOC Research Institute,Beijing 100028,China 0.Institute of Oceanology,Chinese Academy of Sciences,Qingdao,Shandong 266071,China)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]国家海洋信息中心,天津300171 [3]中海油研究总院,北京100028 [4]中国科学院海洋研究所,山东青岛266071

出　　处：《中国海上油气》2017年第3期122-130,共9页China Offshore Oil and Gas

基　　金：中海油田服务股份有限公司科研项目"深水潜标系统的研发与应用(编号:E-23162018)"部分研究成果

摘　　要：利用2013年冬季在南海北部流花海域获取的4个多月的潜标ADCP资料,分析了该海域的流速特征。观测表明该海域内流向以西向流和西南向流为主,最大流速可达1.07 m/s。调和分析结果表明该海域正压潮和斜压潮均以全日潮流为主,正压潮弱于斜压潮;斜压潮潮流在近表层和近底层较强,在250 m层最弱;潮流椭圆长轴方向随水深发生旋转,表层接近东—西方向,底层为东南—西北方向。通过对比同期的卫星高度计资料发现,较强的中尺度涡经过使该海域出现了2次持续性的偏东向异常强流,可能对整个海洋上层的流速和流向产生影响,进而影响钢结构疲劳条件,建议平台设计中应当予以关注。对潜标流速资料进行EOF分析发现,该海域存在较强的斜压模态,斜压流的存在使得海流可能在垂向上形成剪切,剪切力过大会对钻井船或钻井平台作业产生较大危害,建议作业期间应密切关注流速剖面的变化。The current characteristics were analyzed based on the records of 4-month current data in Liuhua area in northern South China Sea. Observations show that the main current directions in this area are west and southwest, and the maximal current velocity is 1. 07 m/s. Harmonic analysis indicates that the barotropic and baroclinic tides are both dominated by diurnal tide, and the barotropic tide is weaker than the baroclinic tide ; the latter is stronger in the near surface layer and bottom layer, and is the weakest in the 250 m layer; the tidal ellipses？ long axis rotates with depth： it is nearly in the direction of west-east in the upper layer and in the direction of northwest-southeast near the bottom. By comparison of the satellite altimeter data in the same period with the mooring data, it is found that 2 processes of strong mesoscale eddies are attributed to the abnormal eastward strong current in the upper layer of the area; the mesoscale eddy may affect both the velocity and direction of the current in the whole upper layer of the o-cean, which in turn may affect the fatigue conditions of steel structures. Consequently it is advised that this affect should be considered in the platform design. The empirical orthogonal function （EOF） is used in the mooring current data, and the result also shows that the current in this area exhibits stronger baroclinic mode which may make the cur-rents in the different layers form shear. Close attention should be paid to this current shear in the marine engineering construction because excessive current shear would be very dangerous to the operations of drilling ships or platforms.

关 键 词：南海流花海域 2013年冬季 潜标ADCP海流特征 正压潮 斜压潮 中尺度祸 斜压模态 

分 类 号：P731.21[天文地球—海洋科学]