三门湾夏季浮游植物现存量和初级生产力   总被引：1，自引：0，他引：1  

刘镇盛  张经  蔡昱明  张志道  刘诚刚 《海洋学研究》2003,21(3):24-33

该海区的生物、化学、水文等项目进行调查。用HQM-1型有机玻璃采水器采集水样,大面观测站仅采集表层(0～1m)水样,用于测定叶绿素a质量浓度和光合作用速率。在N2和N11两个连续观测站,每隔3h采集表层和5m层的水样,用于分析叶绿素a质量浓度及营养盐浓度。同时,用浅 型浮游生物网由近底层向表层垂直拖网采集浮游植物样品,所采样品被装入容积为600cm3的塑料瓶中,并加入20cm3的福尔马林溶液固定保存,供对浮游植物细胞计数和种属鉴定之用。营养盐样品用经酸预清洗过的孔径为0.45μm的醋酸纤维膜过滤,滤液用饱和HgCl2溶液固定后,低温避光保存。图…  相似文献   

A dipole mode at thermocline layer in the tropical Indian Ocean     

Tian Jiwei  Liu Huiqing  Qian Weihong 《海洋学报(英文版)》2003,22(1):15-24

Temperature data at different layers of the past 45 years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.  相似文献   

Non-local impact of large-scale engineering in harbors and gulfs on the environment     

Eduard  Svetlana  Valentin 《Ocean Engineering》2002,29(7):739-752

A system of numerical tools to predict the non-local long-term impact of large-scale constructions on the environment is described. The predictions have to be results of successive examination of free water oscillations, turbulent boundary layers on the sea bottom, and turbulent pulsation effects on sediment transport. Numerical results related to free water oscillations in diverse gulfs are shown, and non-local effects of the dam construction are found for an example of the Baltic Sea. Feasibility of suggested tools for turbulent flow is manifested.  相似文献   

A temperature-dependent reproductive model for spotted seatrout (Cynoscion nebulosus) explaining spatio-temporal variations in reproduction and young-of-the-year recruitment in Florida estuaries     

Kupschus  Sven 《ICES Journal of Marine Science》2004,61(1):3-11

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热带气旋活动对中国夏季雨带类型与ENSO的响应关系   总被引：2，自引：0，他引：2  

陈文玉  陈菊英 《海洋预报》1997,14(1):25-36

本文分析研究了热带气旋１）活动与中国夏季２）３组（包括８种）主要多雨带类型的响应关系。同时对热带气旋活动与夏季大陆气温和ＥＮＳＯ事件的始终时间的响应关系，也进行了探讨。分析表明，夏季中国的雨带分布特征对热带气旋活动有着十分重要的指示意义。热带气旋活动与中国大陆气温有着正相关关系，与ＥＮＳＯ事件的发生有着反相关关系  相似文献   

向阳圩海塘围堰堤坝沉降特性原位实测及稳定性分析     

张敏娟戴旻  黄醒春 《海洋工程》2005,23(2):92-97

以上海市向阳圩海塘围堰主堤为工程背景，在大量原位实测的基础上通过对各测试结果的统计分析研究了软土海滩围堰堤坝及地基沉降位移特性。结果表明：围堰堤坝及地基沉降具有显著的时效特性，沉降与时间的相关关系可用负指数时效特性曲线拟合；各测点位移值随时间具有明显突变变化，整个沉降时域可分为快速沉降时域区及缓慢沉降时域区。同时，在充分考察了沉降速率随时间变化特性的前提下提出了用该参量预测堤坝稳定时间及最终沉降位移的建议。  相似文献   

Marine tether dynamics: retrieval and deployment from a heaving platform     

R. E. Baddour  W. Raman-Nair 《Ocean Engineering》2002,29(13):550-1661

A tether management system of a winch module in a marine environment is proposed. For the purpose of this study the subsea body is considered as a mass attached at the free end of a long tether which is wrapped around a circular drum controlled by an external torque. The winch is considered mounted on a heaving platform. The effect of the heaving platform on the motions of the drum, tether and attached mass are studied with respect to the longitudinal vibrations of the tether in one dimension. The hydrodynamic effects are considered on the deployed portion of the tether and the tethered mass, both of which are assumed submerged in otherwise still water. The resulting nonlinear system of equations of motion is developed and solved numerically for an example of a marine tether system. The effect of the tether extensibility on the operation threshold of the system is identified. Comparison with an inextensible tether case is provided. The numerical results and their analysis for the retrieval/deployment of the system are presented.  相似文献   

厦门岛东海岸的蚀退与防护   总被引：5，自引：0，他引：5  

高智勇  蔡锋  和转  苏贤泽 《台湾海峡》2001,20(4):478-483

根据波浪输沙和地形对比，对厦门岛东部海岸的岸滩侵蚀动态及演变趋势进行探讨，并根据其海岸特点提出相应的防护对策。  相似文献   

开发胶东温泉地热水对环境的影响   总被引：1，自引：0，他引：1  

栾光忠  范德江 《中国海洋大学学报(自然科学版)》1994,(Z3)

根据地热水中阴离子的组分与温泉水类型，指出其中Ⅱ＿１、Ⅱ＿２：型水温高，日采水量大，矿化度高，水质复杂，相应的环境效应明显．提出地热水的大规模开采以及尾水的大量排放，对温泉周边的生态环境、工程环境、土壤及地下水等方面有明显的影响．  相似文献   

21世纪的大洋钻探——IODP   总被引：1，自引：0，他引：1  

薛发玉  翟世奎 《海洋地质与第四纪地质》2002,22(1):109-114

人类在地球科学方面已取得了相当大的成就,但就研究范围而言,却仅仅触及了地球的表层。IODP是一项国际性的大洋钻探计划,预期将于2003年10月正式开始实施。IODP将运用新的科学方法、科技设备,使人类对大洋底乃至整个地球系统得出更深、更广的认识。简单介绍了IODP的由来、组织机构、钻井技术、前期科学目标及中国的深海研究现状,提出中国参与IODP的必要性和可行性。通过了解21世纪的IODP在研究课题及研究技术方面的最新动态,不仅有助于我国根据国际动态调整深海研究的方向,制定符合我国需求的研究计划,而且有助于我国把握参与21世纪IODP的时机和策略,迎接“海洋世纪”的挑战,从而逐步实现“从地学大国走向地学强国”的目标。  相似文献