A Numerical Study of Tidal Asymmetry： Preferable Asymmetry of Nonlinear Mechanisms in Xiangshan Bay,East China Sea     

XU Peng  ;MAO Xinyan  ;JIANG Wensheng  ;ZHOU Liangming 《青岛海洋大学学报(英文版)》2014,(5):733-741

In-situ measurements in Xiangshan Bay, the East China Sea, show that the duration of the rising tide is shorter than that of the falling tide around the bay mouth, while it becomes much longer in the inner bay. A finite volume coastal ocean model（FVCOM） with an unstructured mesh was applied to simulate the asymmetric tidal field of Xiangshan Bay. The model reproduced the observed tidal elevations and currents successfully. Several numerical experiments were conducted to clarify the roles of primary mechanisms underlying the asymmetric tidal field. According to the model results, the time-varying channel depth and nonlinear advection prefer shorter duration of the rising tide in Xiangshan Bay, while the time-varying bay width favors longer duration of the rising tide. The overtides generated by these two opposite types of nonlinear mechanisms are out of phase, resulting in smaller M4 amplitude than the sumfold of each individual contribution. Although the bottom friction as a nonlinear mechanism contributes little to the generation of overtide M4, it is regarded as a mechanism that could cause a shorter duration of the rising tide, for it can slow down the M2 phase speed much more than it slows down the M4 phase speed. The time-varying depth, nonlinear advection and bottom friction are dominating factors around the bay mouth, while the time-varying width dominates in the inner bay, causing the tidal elevation asymmetry to be inverted along the bay.  相似文献   

中国海和泰国湾海域海平面的经向涛动   总被引：1，自引：0，他引：1  

李立 《海洋学报》2014,36(9):7-17

卫星高度计遥感海面高度距平资料(1992-2012年)的分析结果证实中国海(渤、黄、东海及南海)和泰国湾作为一个半封闭的狭长水域,其海平面存在显著的南北经向涛动。涛动呈现明显的季节性,冬季南高北低,夏季北高南低,以渤海和泰国湾的海平面高差作为涛动的测度,其多年平均波动幅度达63cm,较差超过80cm。时间序列分析显示,在季节尺度上这一涛动几乎完全受东亚季风的支配,表明东亚季风的局地强迫是造成季节涛动的主要原因。进一步的分析发现,除季节波动之外研究海域海平面的经向涛动还存在明显的年际变化。不过,与季节尺度的波动有所不同,经向涛动的年际变化不仅是东亚季风区局地作用的结果,而且与太平洋海盆尺度的大气强迫有关,其作用与季风在同一数量级。涛动的年际变化大致滞后各气候因子两个月。采用多输入线性模型做偏相关分析筛选的结果显示,除东亚季风指数之外,研究海域的海平面涛动指数主要与太平洋的南方涛动指数(SOI)和西太平洋遥相关指数(WP)相关。这表明外部强迫既来自热带,也来自中纬度。南方涛动所导致的赤道海域海平面的东西向年际涛动,以及中纬度西风急流年际波动对西北太平洋海平面的作用,都有可能导致研究海域海平面经向涛动的年际变化,其机制有待进一步探讨。  相似文献   

深水浊流形成过程的水动力学模拟:以南海北部琼东南盆地浊流形成过程为例   总被引：2，自引：1，他引：1  

姜涛  张迎朝  汤苏林  张道军  左倩媚  林为人  王亚辉  孙辉  王博 《海洋学报(英文版)》2014,33(12):127-137

Turbidity currents represent a major agent for sediment transport in lakes, seas and oceans. In particu-lar, they formulate the most significant clastic accumulations in the deep sea, which become many of the world＇s most important hydrocarbon reservoirs. Several boreholes in the Qiongdongnan Basin, the north-western South China Sea, have recently revealed turbidity current deposits as significant hydrocarbon res-ervoirs. However, there are some arguments for the potential provenances. To solve this problem, it is es-sential to delineate their sedimentary processes as well as to evaluate their qualities as reservoir. Numerical simulations have been developed rapidly over the last several years, offering insights into turbidity current behaviors, as geologically significant turbidity currents are difficult to directly investigate due to their large scale and often destructive nature. Combined with the interpretation of the turbidity system based on high-resolution 3D seismic data, the paleotophography is acquired via a back-stripping seismic profile integrated with a borehole, i.e., Well A, in the western Qiongdongnan Basin; then a numerical model is built on the basis of this back-stripped profile. After defining the various turbidity current initial boundary conditions, includ-ing grain size, velocity and sediment concentration, the structures and behaviors of turbidity currents are investigated via numerical simulation software ANSYS FLUENT. Finally, the simulated turbidity deposits are compared with the interpreted sedimentary bodies based on 3D seismic data and the potential provenances of the revealed turbidites by Well A are discussed in details. The simulation results indicate that a sedimen-tary body develops far away from its source with an average grain size of 0.1 mm, i.e., sand-size sediment. Taking into account the location and orientation of the simulated seismic line, the consistence between normal forward simulation results and the revealed cores in Well A indicates that the turbidites should ha  相似文献   

基于CCMP风场的近22年中国海海表风场特征分析   总被引：4，自引：0，他引：4  

郑崇伟 《气象与减灾研究》2011,34(3):41-46

利用ESE(NASA Earth Science Enterprise)提供的1987 年7 月-2009 年12 月CCMP(Cross-Calibrated,Multi-Platform)风场资料,对中国海近22 年的海表风场特征进行分析.结果表明,中国海的海表风场具有明显的季节变化;6 级以上大风频率的高值中心集...  相似文献   

中国海多毛纲动物研究现状及展望   总被引：2，自引：0，他引：2  

周进  李新正 《海洋科学》2011,35(6):82-89

根据广泛收集的文献资料,结合作者近年来从事多毛纲动物研究所积累经验,综述了中国海多毛纲动物研究现状,旨在分析和总结其中所存在问题,推动中国海此门类研究。分析结果显示,中国海多毛纲动物研究多集中在分类学领域,在此基础上其他领域研究也陆续开展;综合研究水平和国际相关研究对比,尚存差距。  相似文献   

中国海监83船     

《海洋与海岸带开发》2011,(8):40-43

中国海监83船是国家海洋局南海分局所属的3980吨级海洋监察船,2005年8月入列中国海监南海总队第八支队。在上级领导关怀下,中国海监83船党支部以中国特色社会主义理论为指导,以开展创先争优活动为载体,以打造＂中国海监旗舰＂为目标,带领全体船员不辱使命,忠于职守,勇挑重担.  相似文献   

中国海监厦门市支队     

《海洋与海岸带开发》2011,(6):42-43

中国海监厦门市支队于2003年12月正式组建,其前身为厦门市海洋管理监察大队。几年来,该支队在厦门市海洋与渔业局的正确领导下,在上级海监机构的帮助指导下,大力加强队伍建设,全面履行各项海洋监察职能,为建设海洋生态文明、促进海洋经济可持续发展做出了积极贡献。  相似文献   

中国海监山东省总队          下载免费PDF全文

《海洋开发与管理》2011,28(2):59-61

中国海监山东省总队自1998年挂牌成立以来,在国家海洋局、中国海监总队的统一指导下,在山东省海洋与渔业厅的正确领导下,始终以科学发展观统领全局,在"建设一流队伍、配置一流设备、实施一流管理、提供一流服务"的"四个一流"上下功夫,全面履行海洋监察职责,不断推进海监执法工作向法制化、规范化、科学化方向迈进,为山东省海洋开发与利用提供了有力保障.  相似文献   

行走西沙          下载免费PDF全文

黄冉 《海洋开发与管理》2011,28(12):84-87

2011年12月初,经过近四个小时的飞行,我从“零”度飘雪的北京降落在骄阳碧海近30摄氏度气温的三亚,当晚我便乘着四千吨级的“中国海监83”执法船开始了我的西沙之行。每年的这个季节正是季风肆虐的时候,海上的风浪经常是风力8级、浪高5米,四千吨级的大船在浪涌的夹击下也时常摇摆17度左右,  相似文献   

中国海监广东省总队政治思想和廉政建设工作纪实          下载免费PDF全文

刘涛 《海洋开发与管理》2011,28(12):54-54

加强中国海监队伍的政治思想和廉政建设,是中国海监建队方针之一,这是根据海监队伍的性质和所承担的职能任务而提出来的,是中国海监提高队伍整体素质、确保队伍战斗力、完成好各项具体任务的重要保障和必然选择,也是党的政治工作在海监工作中的具体体现。  相似文献