青岛海湾大桥对胶州湾潮汐、潮流及余环流的影响预测——Ⅱ.预测方法的探讨     

孙英兰  田晖  郑连远  陈时俊 《中国海洋大学学报(自然科学版)》1994,(Z1)

旨在预测青岛海湾大桥对胶州湾潮流场产生的影响,首先对桥墩附近流场进行了数值计算,阐明了桥墩对流场影响的范围及程度,提出预测潮流变化所需的参数,尔后,对预测中所用替代方法的可行性进行了探讨。  相似文献   

2017年辽东湾夏季潮汐锋位置变化的分析     

张广跃  魏皓  肖劲根  张海彦  李志成 《海洋与湖沼》2020,51(1):1-12

近海潮汐锋的分布和变化，主要受表层风摩擦、底层潮混合、净热通量和浮力平流的影响。基于2017年7、8月份辽东湾东部海域的实测数据，并结合ROMS（Regional Ocean Model System）模拟结果，利用考虑浮力平流效应的Stigebrandt公式对夏季辽东湾潮汐锋的位置变化进行了诊断计算，计算结果与ROMS模拟的潮汐锋位置符合较好，进一步探讨了风、净热通量和浮力平流对锋面位置变化的影响。主要结论如下：（1）位于辽东湾北部和东、西沿岸浅水区的潮汐锋呈"几"字形分布；（2）2017年6-7月潮汐锋位置变动不大，7月份仅在辽东湾东、西两岸潮汐锋位置略微向深水区移动，这主要是净热通量整体略微减小和风场略微增大造成的，浮力平流作用效果不够显著；（3）2017年8月辽东湾潮汐锋位置较7月向深水区大幅移动，最大移动距离约为20km，辽东湾8月份净热通量的大幅减弱起到了重要作用，浮力平流使潮汐锋位置向浅水区偏移，其调节效果比较显著。  相似文献   

湄州湾现代沉积过程     

郭允谋  陈华胄  杨顺良 《热带海洋学报》1993,(3)

湄州湾强劲的潮流导致外海泥沙输入,但受一定程度的限制,海湾周围的陆源碎屑成为沉积物质的主要来源。水动力,特别是潮流作用控制现代沉积的格局,潮流冲刷槽为粗粒沉积属海底冲刷产物,两侧的斜坡及潮坪,从湾中央向岸,从粗细混合沉积物过渡为细粒沉积,属淤积产物。  相似文献   

浙江省滩涂资源的动态变化分析   总被引：1，自引：0，他引：1  

卢晓燕  曾金年 《海洋学研究》2006,24(Z1):67-72

科学合理地开发、利用和保护滩涂这一重要资源,可有效地保障土地安全、缓解浙江省用地需求矛盾.要想合理地开发利用滩涂资源,首先必须了解它的属性及特点.从围垦历史及滩涂的开发现状、滩涂资源面积的动态变化、不同时期的海图对比、泥沙来源以及人类活动对滩涂淤涨速率的影响等方面进行论述,归纳得出浙江省滩涂资源的动态再生性规律.  相似文献   

A Finite Volume Method with Unstructured Triangular Grids for Numerical Modeling of Tidal Current   总被引：1，自引：1，他引：1  

史宏达  刘臻 《中国海洋工程》2005,19(4):693-700

The finite volume method （FVM） has many advantages in 2-D shallow water numerical simulation. In this study, the finite volume method is used with unstructured triangular grids to simulate the tidal currents. The Roe scheme is applied in the calculation of the intercell numerical flux, and the MUSCL method is introduced to improve its accuracy. The time integral is a two-step scheme of forecast and revision. For the verification of the present method, the Stoker＇s problem is calculated and the result is compared with the mathematically analytic solutions. The comparison indicates that the method is feasible. A sea area of a port is used as an example to test the method established here. The result shows that the present computational method is satisfactory, and it could be applied to the engineering fields.  相似文献   

我国入海河流河口地区海陆分界线划分方法研究   总被引：7，自引：0，他引：7  

于健  吴桑云  李萍 《海岸工程》2003,22(2):51-59

目前我圈大多数入海河口地区没有划定明确的海陆分界线，导致相关部门之间权责不清，不利于解决河口海岸存在的污染、湿地退化、海岸侵蚀等环境问题和加强河口海岸地区的综合管理，因此迫切需要划定明确的河口海陆分界线．根据我国主要入海河口的类型及特点，从合理性、实用性、稳定性等多个角度提出分析了关于河口海陆分界线划分的几种观点，总结其优缺点，最后提出可行的方法．  相似文献   

Frictionless Generation of a Tidal Eulerian Residual Flow over a Sill in a Narrow Channel     

Katsurou Katsumata  Toshiyuki Hibiya 《Journal of Oceanography》2003,59(3):325-329

Using a vertically two-dimensional, two-layer model, we have analytically examined the generation mechanism of a nonzero Eulerian residual flow by strong tide-topography interaction in a narrow channel where the frictional effect is not included. In this case, tidally generated baroclinic disturbances are forced non-uniformly in space and time while being advected by a strong tidal flow over the non-uniform slope of the bottom topography. Consequently, nonzero Eulerian residual flow results when averaged over one tidal period. Although the time average of the velocity field is thus nonzero, the associated Eulerian residual transport in each layer is compensated by a Stokes transport so that no Lagrangian residual transport results in both layers. This warns us that simple time averaging of the velocity data obtained at a fixed mooring station might lead to a spurious material transport. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Recent Occurrences of Dinophysis fortii (Dinophyceae) in the Okkirai Bay, Sanriku, Northern Japan, and Related Environmental Factors     

Kazuhiko Koike  Hirotaka Otobe  Minoru Takagi  Tadahisa Yoshida  Takehiko Ogata  Takashi Ishimaru 《Journal of Oceanography》2001,57(2):165-175

Occurrence of Dinophysis fortii, a causative organism of diarrhetic shellfish poisoning, in the Okkirai Bay, Sanriku was surveyed in 1995, 1996, 1998 and 1999. In each year, its major occurrence was detected from the late May or early June and continued until the late June or early July. Seawater temperature, salinity and nutrients measurements suggested that inflows of offshore water into the bay played key role on the first major occurrence of D. fortii. With an analysis of continuous temperature data in the Otsuchi Bay which locates north of the Okkirai Bay, this influent was considered to be intermittent inflow of the offshore water by internal tidal waves which propagated from north to south. First occurrence peak of D. fortii was synchronous with phycobilin containing microalgae, synechococcoid cyanobacteria and cryptomonad, in all years. In vivo fluorescence measurement of D. fortii cells in 1995 and 96 showed that the cells in these microalgal-rich water contained more phycobilin pigment than those in the microalgal-poor water. The result may support a hypothesis that D. fortii acquires phycobilin by an uptake of these microalgae. After the first major occurrence in the bay, D. fortii sometimes occurred in rather inshore waters where showed elevated ammonium level possibly due to increased heterotrophic activity. Together with another finding that D. fortii is mixotrophic, it could be assumed that the environment being suited to heterotrophic nutrition also stimulates D. fortii growth in the bay.  相似文献   

Water circulation dynamics, water column nutrients and plankton productivity in a well-flushed tropical bay in Kenya     

J.U. Kitheka  B.O. Ohowa  B.M. Mwashote  W.S. Shimbira  J.M. Mwaluma  J.M. Kazungu 《Journal of Sea Research》1996,35(4):257-268

Water circulation, water column nutrients and plankton productivity were studied in a tropical bay with high rates of water exchange (60% to 90% per tide) and short residence times (3 to 4 h). The water circulation is predominantly affected by the semi-diurnal tides, which cause strong and reversing currents in the mangrove creeks (0.60 m·s⁻¹) and currents of low magnitude in the neighbouring seagrass and coral reef zones (< 0.30 m·s⁻¹). Tidal asymmetry, with relatively stronger ebb than flood flows in the mangrove creeks, promotes the net export of nutrients from the river mouth and of organic matter from the mangroves to the seagrass beds. The main sources of the dissolved inorganic nutrients are two rivers (the Kidogoweni and Mkurumuji) which discharge (up to 17.0 m³·s⁻¹) in the upper and lower regions of the bay. The increased input of nutrients did not cause eutrophic conditions since nutrients were rapidly flushed out of the bay. The mangrove biotope generated small amounts of dissolved nutrients which are likely to be used for primary production within the mangrove zone. The production of nutrients in the mangrove zone was masked by high rates of flushing, such that no appreciable nutrient signal was detected in the dry season when the influence of the rivers diminished. The rates of primary production were low in the mangrove, seagrass, and coral reef biotopes in the dry season. Primary production increased slightly during the rainy season. The level of chlorophyll a in the mangrove biotope increased during ebb tides and decreased during flood tides. The highest zooplankton densities, which could not be related directly to primary production in the water-column, occurred at the seagrass station during the wet season.  相似文献   

对沙埕港建设潮汐发电综合利用工程的管见     

郭成涛 《海洋学研究》1991,9(3):34-39

沙埕港流域物产丰富,目前因电力紧缺多未开发。该港潮汐能源多,地形、地质条件利于建站工程,故拟在百尺门、长屿两处建潮汐电站,并与当地水电等联合运行,可收发电、矿产、水产、航运交通以及农、林、副业等多方面综合利用效益。  相似文献