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本文研究任意倾角的线性倾斜海底上的定常风海流问题。此问题归结为求解无界角域内的亥姆霍兹方程边值问题。通过保角变换构造出了该问题的格林函数,从而得出解式。最后对典型海域的流场进行了数值计算,并给出断面上的流场图。 相似文献
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陆源污染物对连云港海域环境影响研究 总被引：6，自引：0，他引：6
应用沿深平均二维模型模拟了连云港海域的潮流场,分析了该海域的潮波特性,在此基础上,应用扩散方程对连云港海域的水污染扩散进行了数值模拟,得到了港域水体的半交换期;比较分析了西大堤对该水域水交换的影响;计算了港域水体的Lagrange余流场,并分析了其对污染物运移的影响,得到了港域几个典型位置的Lagrange轨迹;计算了港域的纳潮量,综合分析了港域水体的物理自净能力。 相似文献
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马迹山港三期工程对附近海域泥沙淤积的影响 总被引：1，自引：0，他引：1
应用海洋数值模式（FVCOM）建立马迹山港三期工程海域三维潮流模型,模拟港口建设前后的潮流场,研究工程后周边海域潮流场的变化。同时结合台风“灿鸿”的风场资料,在水动力的基础上添加台风气压场和风场,建立风暴潮数值模型,分析在极端天气下三期工程的建设对周边海域流场的影响。最后结合模型计算结果,根据现场调查资料以及历史试验成果进行工程周边海域泥沙回淤以及风暴潮骤淤的计算分析。结果表明：工程后流场的变化主要集中在工程区和附近海域,变化幅度约在0.3m/s~0.4m/s之间,对工程区以外大范围海域影响较小。工程后码头水流条件得到较好的改善,水流与码头走向趋于平行。工程周边海域泥沙回淤量较小,不会对船舶航行安全造成影响,另据骤淤计算结果分析,马迹山港周边海域在台风期间的短期淤强较小,两天的淤积量不超过5cm,不具备骤淤的可能性。 相似文献
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清澜港位于海南岛文昌县东岸,是一个重要的渔港。1980年初,我们将“南浮1号”浮标投放手清澜港附近最深的地方(约9.5米),在岸站(广州市本所大楼内)每隔1小时或3小时收集浮标现场的水文、气象测量数据一次(本所新技术研究室,1981;叶龙飞、余文森、黄人韬,1981)。历时共78天。 相似文献
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上海国际航运中心洋山深水港区一期工程起步位置的探讨 总被引：3，自引：0，他引：3
通过对拟建港址处工程前后流场的分析 ,提出整治设想 ,探讨在具有多岛屿、多通道、中强潮、高含沙量特征的外海建港如何起步 相似文献
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用简单的一维浅水方程,与盐度变化和潮波同相位的长期观测结果验证,对海南岛清澜河口进行分析计算,可以得出它的一些特征。清澜河口虽然处在南海弱潮区,仍是典型的潮汐控制的强混合型;潮波被河口反射形成驻波,因而潮波、流速和盐度存在特殊的关系;盐度值和纵向扩散系数也可以进行估算,得出近乎实测值的结果。 相似文献
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计算方法如图(3)所示,石臼港面临广阔的海域,曲线表示岸线,A、B、C、D为岸线格网点。二期工程拟从A点至E点修建码头和防波堤。建成后港内X方向最大距离为5100米,Y方向在湾口处为2600米。三期工程如图(5)所示,湾口宽为500米。二、三期工程建成后,港内的潮流流场必将发生巨大的变化。建港前预知建港后的潮流 相似文献
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《Marine Chemistry》2002,79(1):27-36
Preformed Cd and PO4 were investigated in the northwestern Pacific (Station CM05) and the Okhotsk Sea (Station CM06), and the relationship between the two elements was examined. At CM05, from the apparent oxygen utilization (AOU)–Cd and PO4 plot, the different molecular ratios of consumed O2 to regenerated Cd and PO4 were calculated to be 254,000 (Cd) and 96 (PO4) for the shallow layer (30–99 m) and 613,000 (Cd) and 170 (PO4) for the deep layer (below the oxygen minimum layer), which suggested the preferential remineralization of Cd and PO4 in the shallow layer. At CM06, regeneration ratios of O2/Cd, PO4 were obtained only in the shallow layer (29–124 m) as 227,000 (Cd) and 75 (PO4). The calculated preformed Cd and PO4 concentrations in the shallow layer were 0.59 nM of Cd and 1.6 μM of PO4 at CM05 and 0.35 nM of Cd and 0.95 μM of PO4 at CM06. These concentrations were much higher than those (close to 0) in the low-latitude area, which was attributable to the supply of these constituents from deep water by the strong winter convection. In the deep layer, at CM05, preformed concentrations were 0.64 nM of Cd and 1.4 μM of PO4. Preformed PO4 generally agreed with previously reported values in the Pacific, which suggested that the concentrations of the initial PO4 in the deep water were preserved as preformed through the movement to the northwestern Pacific. On the other hand, obtained preformed Cd in the northwestern Pacific deep water showed a somewhat higher value than that in the southwest Pacific. The possibility of the terrestrial input and remineralization of Cd by CaCO3 dissolution during the northward movement was considered. A plot of Cd and PO4 showed a linear relationship with slopes of 0.34 and 0.40 (nM/μM) at CM05 and CM06, respectively, which generally agreed with the reported values in the North Pacific. 相似文献
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渤海、黄海、东海冬季海流场温度场数值模拟和同化技术 总被引：6，自引：0，他引：6
利用NASA高分辨率的卫星遥感资料SST,采用Nudging同化来模拟渤海、黄海、东海的三维温度场,减小用热通量作上边界条件所带来的误差.结果表明,模拟的海流场能较好地反映渤海、黄海、东海的环流特征.数据同化后的温度场优于未经同化的温度场.3个选择站点的同化值与实测值的均方根误差分别为1.307,0.526,0.744,用热通量资料模拟的水温与实测值的均方根误差分别为2.160,0.979,1.330.尽管只同化了海表温度,但数据同化对三维温度场结构都有影响. 相似文献
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海南省海岸带和海洋资源与环境问题及对策研究 总被引：7，自引：0，他引：7
在分析海南省海岸带和海洋资源与环境优势的基础上，指出当前存在的5个主要问题，即海洋资源的综合开发利用缺乏统一的规划、海洋防护林和生物资源破坏严重、水质富营养化、海域污染等，并对存在问题提出今后的对策。 相似文献
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2004年，是我国海洋工作面临历史性机遇和挑战的一年。中国海监总队在国家海洋局的领导和关怀下，在局各有关部门和各分局、各沿海省(自治区、直辖市)海洋厅(局)的大力支持下，坚持以邓小平理论和“三个代表”重要思想为指导，认真贯彻党的十六大和十六届三中、四中全会精神，全面落实局党组2004年的重点工作，以执法能力建设为重点，以海盾系列专项执法、执法示范工作为主线，上下团结一致，与时俱进，开拓进取，认真履行职能，全力推进全国海监队伍建设和海洋执法监察工作。 相似文献
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Robert Hage 《Marine Policy》1984,8(1):2-15
This is a historical review of Canadian policy at the Third UN Conference on the Law of the Sea. Canadian objectives with regard to the territorial sea, fisheries, pollution prevention and the continental shelf are outlined and the role played by the Canadian delegation at UNCLOS is described. The article then examines the impact of the Convention on Canada, particular attention being paid to the Canadian Exclusive Economic Zone and the Canadian role in the controversy over seabed mining. The author concludes by arguing that Canada was a major beneficiary of the Convention, but that US opposition has placed the future of the Convention in jeopardy. 相似文献
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Aleksandras Rybakovas Janina Bar&#x;ien&#x; Thomas Lang 《Marine environmental research》2009,68(5):246-256
Micronuclei (MN), nuclear buds (NB) and fragmented-apoptotic cells (FA) were analyzed in mature peripheral blood and immature cephalic kidney erythrocytes of flounder (Platichthys flesus), dab (Limanda limanda) and cod (Gadus morhua) from 12 offshore sites in the Baltic Sea (479 specimens) and 11 sites in the North Sea (291 specimens), which were collected during three research vessel cruises in December 2002, 2003 and in September 2004. The highest levels of environmental genotoxicity (frequencies of MN up to 0.5‰, NB – up to 0.75‰) and cytotoxicity (FA – up to 0.53‰) were observed in flatfishes from areas close to oil and gas platforms in the North Sea and in zones related to the extensive shipping and potentially influenced by contamination from large European Rivers (Elbe, Vistula, Oder). In dab from the offshore zones of the North Sea, the levels of nuclear abnormalities were higher as compared to those in dab from the Baltic Sea. Responses in immature kidney erythrocytes were higher than in mature erythrocytes from peripheral blood. MN frequency lower than 0.05‰ (the Baltic Sea) and lower than 0.1‰ (the North Sea) could be suspected as a reference level in the peripheral blood erythrocytes of flatfish. 相似文献
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The purpose of our work was to obtain the most possible detailed information about the composition, concentration, and structural
features of the magnetic minerals contained in the rock to reveal the differences in the magnetic properties of the peridotites
under various circumstances of the mantle magmatism and different conditions of metamorphism. To do this, we examined and
analyzed the magnetic and petrographic characteristics of four collections of oceanic and alpinotype spinel peridotites. The
main object for comparing the magnetic characteristics was the Gorringe ridge, which lies in the eastern part of the Atlantic
Ocean. The peridotite samples from the Gorringe ridge differ from the other collections in many magnetic parameters: I
n
, χ, Q, I
rs
/I
s
, H
c
, H
cr
, and H
m
. The principal question of our work was to clarify the nature of the Earth’s crust where the Gorringe ridge formed. This
subject was studied many times in the literature, but the researchers did not reach a common opinion. In accordance with our
data, the spinel peridotites from the Gorringe ridge represent a subcontinental lithosphere mantle of the Iberian continental
margin. During the metamorphism, the formation of magnetite occurred in the peridotites of the Gorringe ridge in several stages
and had a regressive character. Our investigations explain the results of the analysis of the anomalous magnetic field over
the Gorringe ridge, which is characterized by sharp roughness and high intensity of the local signchanging anomalies. 相似文献
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A. A. Sizov 《Physical Oceanography》1992,3(5):349-355
A conclusion about two extreme regimes existing in the large-scale circulation in the North Atlantic has been drawn based on an analysis of the inter-annual variability of the analogue to the Rossby index, as well as that of the heat and dynamic characteristics in separate areas of the north subtropical circulation. The former is defined by a high level of circulation both in the atmosphere and in the subtropical water circulation. In the current century this regime was realized mainly in the years pertaining to the middle and end of a 22-year solar activity cycle (a 22-year cycle). The relatively low level of atmospheric circulation and the slackened water mass transport are typical of the second regime. It dominated mainly during the years relevant to the beginning and second half of a 22-year solar activity cycle.Translated by Mikhail M. Trufanov. 相似文献
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The upper Oyashio intermediate water, one of the source waters for the Sea of Okhotsk intermediate water, is exhibiting a
warming trend. The historical data show that the upper Oyashio temperature increased by 2.4°C during 1953 to 2007 at the potential
density of 26.75 at depths of approximately 170 m. This rate of warming is much faster than that of the global ocean and the
Sea of Okhotsk. The upper Oyashio warming is likely linked to the penetration of warm water of the Alaskan Stream westward.
One mechanism of this warm Alaskan Stream water penetration is associated with large Aleutian eddies. 相似文献