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1.
潮汐余流对中国东部海域物质输运过程起着重要作用。通过对中国东部海域的三维数值模拟,计算了潮汐余流并从潮余涡量角度分析了其形成机制。中国东部海域的欧拉余流在水深较浅的朝鲜半岛沿岸、苏北浅滩、长江浅滩、闽浙沿岸,以及冲绳海槽附近海域,流速量级较大,以余流涡旋的形式呈现,其机制为局部地形差异和潮汐水位高度波动下,科氏效应或摩擦效应导致潮周期内存在净涡量。斯托克斯漂流量级在浅水区较大,而在深水海域则远小于欧拉余流。拉格朗日余流在深水区域与欧拉余流相似,在浅水区域由欧拉余流和斯托克斯漂流共同决定。输运余流和拉格朗日余流分布特征更接近,特别是在近岸海域,但两者的物理意义并不相同。潮汐余流由于常年稳定存在,且在许多海域的流动方向同已知的沿岸流系的方向基本一致,是中国东部海域沿岸流的重要组成部分。估算出了输运余流对沿岸流的贡献率或抑制率,输运余流对近岸陆源沉积物输运和沉积物分布具有不可忽略的作用。 相似文献
2.
为了研究渤海湾潮致余流,运用Mike21模拟了渤海湾潮流场,揭示出潮波运动的规律,得到渤海湾的潮流场,在涨潮时最大流速为1.4m/s,落潮时最大流速为1.12m/s。根据欧拉余流的定义计算了潮致欧拉余流场,其最大流速为0.2m/s,中值为0.005m/s,在渤海湾北部区域和南部东营附近存在环状结构。在渤海湾不同位置释放自由粒子,通过粒子的运移路径发现渤海湾拉格朗日余流呈现双环结构。运用欧拉方法和拉格朗日方法分析渤海湾潮致余流场,阐明了渤海湾潮致余流的精细结构,可为渤海湾营养盐、沉积物或者污染物质的长期输送以及浮游生物、鱼卵等的迁移和分布规律等提供动力学基础。 相似文献
3.
江苏辐射沙洲水道垂线平均余流的计算与分析 总被引：3，自引：0，他引：3
根据辐射沙洲邻近主水道和中心沙洲滩面水道33个站次的准同步实测潮流资料, 计算了各站位垂线平均欧拉余流、斯托克斯余流、拉格朗日余流, 并分别进行了逐站位的分析和比较.各站位斯托克斯余流相对较小, 在水道口门处斯托克斯余流较大, 余流流向大都沿涨潮流向, 豆腐渣腰门水道及其以东站位的斯托克斯余流则大致沿落潮流向.欧拉余流和拉格朗日余流大小和流向基本一致.研究海域存在着半封闭的顺时针方向的海水净输移.西洋水道和条鱼港水道是辐射沙洲中心腹地的净进水通道, 而豆腐渣腰门水道、陈家坞槽水道、外王家槽水道、苦水洋海域水道则是净出水通道. 相似文献
4.
为掌握莱州湾潮余流特征和粒子运移特征,文章采取平面二维数值模拟的方法,计算得到莱州湾的潮流场,并分析潮流结构;在潮流场的基础上,计算和分析欧拉余流场;通过在不同位置释放自由运动的粒子,得到潮流作用下自由运动粒子的运移轨迹。研究结果表明：莱州湾涨潮时的最大流速约为2.19 m/s,落潮时的最大流速约为2.66 m/s,且均在湾口处出现最大流速;莱州湾欧拉余流速度较小,且湾口附近较大而湾内较小;莱州湾分布均匀的粒子在自由运移时出现不同程度的聚集,且整体运移趋势是向岸聚集。 相似文献
5.
基于MIKE21的HD模型,通过模拟得到胶州湾的潮流场,胶州湾在涨急时最大流速1.04m/s,落急时最大流速约为0.96m/s。胶州湾余流总体较小,平均为0.03m/s左右。并在湾内不同位置释放自由粒子,以MIKE21的Particle tracking模型计算出其在潮流作用下的运移轨迹,结果表明粒子大多数运移到湾内近岸区域,少部分在湾口区域附近;在潮流场基础上计算了欧拉余流场,并和粒子运移结果进行对比,表明欧拉余流场在区域流向比较一致时可以表示粒子运动的趋势,为物质迁移、控制污染等方面提供了一定的参考借鉴意义。 相似文献
6.
狭长海湾象山港三维污染物运移特征的数值模拟 总被引：2，自引：0，他引：2
为了探明污染物在狭长海湾象山港内的输运规律,在验证良好的三维潮流模型基础上,计算和分析了不同驱动因素下的余环流结构和污染物的三维运移特征。余流模拟结果表明该海域余流结构区域差异性明显,狭湾内夏季余流垂向分层明显,表、底余流方向相反,分界点约在0.4~0.5倍水深处;口门及以外海域主要以水平环流为主。进一步采用拉格朗日粒子追踪方法,模拟了示踪粒子在湾内的三维运移轨迹。通过对不同位置释放的污染物粒子运移轨迹进行比较分析,最后给出了模拟期间的污染物运移规律。研究结果可为排污口选址和海湾污染治理等提供科学依据。 相似文献
7.
8.
本文采用二维浅水潮流方程,欧拉余流模型和拉格朗日余流模型,并通过数值模拟的方法,研究了厦门港南部附近海域的水动力输运特征。结果表明,该海域的水动力输运条件良好,水交换能力罗强。 相似文献
9.
基于MIKE 3开展了罗源湾的三维数值模拟,以流场和断面垂向流速阐释了罗源湾的潮流分布特征,计算了罗源湾的潮致余流场,采用拉格朗日粒子追踪法模拟了具有粒子特性的物质在湾内的运移并分析了粒子的运动规律,结合潮流和潮致余流特征讨论了罗源湾不同区域的物理自净能力。研究结果表明,罗源湾西北部、东北岸内凹处和内湾口处形成了余环流结构,湾内不同区域的物质分布与潮致余流结构有明显相关性,粒子在罗源湾西北部海域运移缓慢,而湾口及可门水道附近具有较好的自净能力。本研究为进一步探讨罗源湾污染物质分布机制提供了科学依据,为罗源湾的污染控制和环境保护提供了技术支撑,研究方法也为其他海湾的相关研究提供借鉴参考。 相似文献
10.
基于2017年春季和冬季的海流资料分析了红海湾海区海流特征、潮流状况、涨落潮流特性、余流特征及表层漂流特征。研究海域共布设3个临时潮位观测站和11个全潮水文观测站。根据流速、流向过程曲线和潮位过程曲线的关系,得出涨(落)潮流速最大的时刻和最小流速发生时刻与潮位关系并非固定在高(低)潮时或半潮面左右,由此看出,研究海域的潮波介于驻波与前进波之间,属于不规则半日潮流主导的海域。研究海域中大部分站位潮流属于往复流,少数站位潮流运动具有一定的旋转性,平均涨潮流速最大为7 cm/s,平均退潮流速最大为14 cm/s。春季大潮期和中潮期各站余流流向整体为偏东向,小潮期,除少数测站余流流向偏向南东向,其余测站余流流向偏西向;冬季大潮期和中潮期各站余流流向整体为偏西向,小潮期,湾西侧余流流向偏西向,湾东侧余流流向偏南东向。垂向上各层余流流速由表至底逐渐减小,流向基本一致。 相似文献
11.
The analysis of the structure of the cryolithozone, facies, and thicknesses of the Quaternary sediments and the results of the physicochemical mathematical modeling of the modern shelf of the western part of the Laptev Sea support the influence of the Late Pleistocene glaciations on the heat conditions and the distribution of the permafrost in the area. A ～200-m thick glacier formed under aerial conditions from atmospheric precipitation represented the metamorphosed snow cover. According to the modeling, the long-living (from 60?50 to 10?4 ky) glacier reduced the thickness of the permafrost rocks in the reviewed shelf area for 280–360 m. The Holocene marine transgression additionally decreased the thickness from 50–140 m on the inner shelf to 220–350 m on the outer shelf. The modern submarine cryolithozone 450-0 m thick is wide-spread in the studied region from the coast to the shelf boundary (isobaths of 130–140 m), where it pinches out at a distance of ～380 km from the coast at a depth of ～250 m above the sea level. 相似文献
12.
We analyze the components of the carbon system of the Sevastopol bay waters and the balance of main sediment-forming substances
using the data of field investigations in 1998–2008. The interannual variations of total inorganic carbon and the equilibrium
partial pressure of carbon dioxide in the bay water are noted. An increase in the flux of carbon dioxide into the bay and
in the content of organic carbon in bottom sediments is revealed, and an explanation of this phenomenon is given. The priority
accumulation of organic carbon in the sediments of the bay is established. We assess the interannual variation in the relative
abundances of organic and inorganic carbon as an index of the carbon cycle stability. 相似文献
13.
We generalize and analyze the state of investigations of the influence of river waters on the hydrologic structure of the
Black Sea. Specific features of the water, regime and hydrography of rivers flowing into the sea, data on the discharge of
rivers, and intrayear and interyear variability of the discharge are presented. We discuss and analyze works studying the
transformation of river waters, routes of desalinized sea waters, and their influence on the thermohaline structure and dynamic
regime of the sea.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
14.
双壳贝类血淋巴中儿茶酚胺的检测方法初步研究 总被引：1，自引：0，他引：1
研究的目的是探索一种检测双壳贝类血淋巴中儿茶酚胺含量的方法。以栉孔扇贝(Chlamysfarreri)和长牡蛎(Crassostreagigas)为实验对象,研究了取样、抗氧化剂、氧化铝用量以及Tris缓冲液用量等对实验结果的影响。结果表明,高效液相色谱电化学检测器法(HPLC-ECD)可以灵敏高效地对双壳贝类血淋巴中儿茶酚胺进行定性、定量检测。实验表明,取样时间最长不超过1.5min;还原性谷胱甘肽作抗氧化剂效果较好;前处理各试剂与血样量的最适配比为血样量1.5mL,Tris缓冲液(1.5mol/L,pH8.6)1mL和氧化铝25mg;水洗后离心并尽可能吸干氧化铝中的水分。去甲肾上腺素、肾上腺素和多巴胺的回收率分别为53%~69%、47%~73%和48%~56%。 相似文献
15.
为研究黄河入海径流变化条件下河口附近海域盐度扩散特征,以更好地保护河口海域生物资源多样性,本文以黄河下游利津水文站的长序列实测径流数据资料为基础,利用近海水动力模型FVCOM,分析径流变化对黄河口海域盐度的影响规律。结果表明：黄河口与莱州湾之间存在顺时针的环流系统,在余流作用以及涨落潮方向的影响下,黄河冲淡水长期向莱州湾扩散;丰水期黄河冲淡水几乎影响了整个莱州湾,27盐度锋可以到达莱州湾中部,27等盐线的表层包络面积为2 665.61 km2,占莱州湾的1/4左右,枯水期低盐度水只有向南扩散的趋势,27以下的低盐度水集中分布在黄河口门附近,27等盐线的表层包络面积只有199.65 km2;5月份,随着入海径流量增加,27等盐线扩散的范围、距离、方向都会发生明显变化。在对近海生物资源有迫切保护需求的情景下,适当减少其他用水户供水量以增加入海生态径流量,可以有效改善黄河口海域附近的盐度情况,为生物资源的生长繁殖创造良好条件。 相似文献
16.
V. A. Ivanov S. P. Lyubartseva N. Mikhailova N. B. Shapiro 《Physical Oceanography》2001,11(6):509-524
We analyze the results of numerical calculations performed according to the three-dimensional interdisciplinary model of an
ecological system of the Black-Sea shelf zone near the estuary of the Danube. The complete system of equations of hydrothermodynamics
is solved together with transport equations of the advection-diffusion-reaction type used to describe the transformation of
a substance (nitrogen) between the components of the characteristic vectors of the ecosystem: plankton, detritus, and biogenic
elements (nitrates). We describe the distinctive features of the circumcontinental distribution of components obtained as
a result of numerical experiments and present arguments for the conclusion that the ecosystem of the Danube estuary water
area plays the role of a buffer zone between the press of the Danubian biogenic pollutions and the neighbouring areas of the
shelf zone and open sea.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
17.
The authors have previously determined that the effectiveness and failure pattern of the ice cover caused by flexural-gravity waves generated by a submerged body motion near the bottom ice can greatly depend on the depth of the water area. In its turn, the presence of a ledge on the ice surface may affect a wave propagation pattern. This paper presents an experimental study of the bottom contour influence on the deflection and length of flexural-gravity waves. The authors describe a numerical model for the analysis of the deformed state of ice caused by hydrodynamic loads due to a submarine motion, taking into account the bottom contour. The experiments are carried out in the ice tank. The results of calculations and experiments are compared. 相似文献
18.
Ten years of semistationary studies of the interaction of the ice cover and the coastal relief of the Kandalakhsa Gulf in the White Sea allowed us to reveal the peculiarities of these processes in the warm and cold years and the mechanisms of the origination of ice forms, including ice tents, which govern the character of the tidal flats. Three dynamic fast ice zones are distinguished by their geomorphological location, morphology, and ice dynamics. The dependence of the mechanisms and volumes of the enrichment of the fast ice in the sediments on the coastal zone??s relief was established. At the coast of the Kindo Peninsula (Velikaya Salma Strait), the ice mostly contains fine-sandy sediments. Coarser sediments, including boulders, are occasional and frozen into the ice at the contact of the fast ice and the bottom. At the expense of the ice??s spreading by 4?C6 times in the warm years and 2?C4 times in the cold years, several thousand tons of sediments mostly from the tidal flat??s surface (100?C700 m3 from 1 km of coast in the wide tidal flats and <50 m3 on the steep coasts) are delivered to the water area. 相似文献
19.
Relationship between the path of the Kuroshio in the south of Japan and the path of the Kuroshio Extension in the east 总被引：2，自引：0，他引：2
A relationship between paths of the Kuroshio and Kuroshio Extension (KE) is investigated, using the satellite-derived altimetry
dataset of 1993–2008. When the Kuroshio takes the nearshore nonlarge meander path or typical large meander path and resultantly
goes through the deeper channel (about 2500 m) of the Izu-Ogasawara Ridge, the KE path adopts a relatively stable state with
the two quasi-stationary meanders. On the other hand, when the Kuroshio takes the offshore nonlarge meander path and then
passes over the shallower part of the Ridge (about 1000 m), the KE path tends to be convoluted, i.e., an unstable state. 相似文献
20.
随着国产投弃式温深仪(XBT)性能的提高,其使用范围和规模也逐步扩大,受某专项办的委托,厦门大学在南海东北部开展了"海洋监测设备适用性检验规范及海上试验研究(国家863计划)"项目,针对海洋技术领域研发的技术较为成熟、具备产品化条件的XBT开展检验与验证,对国产XBT的性能和实际使用情况进行分析和总结。试验中,在不同站点进行温盐深仪(CTD)现场测量,以此数据为真值对国产和进口XBT精度做评估。在较高速度走航测量时,则以进口XBT数据为参照,对国产XBT进行评估。试验结果表明,国产XBT整体上表现良好,成功率大概为80%,有些型号的国产XBT精度与进口XBT精度接近,但国产XBT无效剖面较多。同时也发现,进口XBT的精度无法满足预期比测的要求,不能准确计算出国产XBT精度,但结果仍然具有参考价值。本次试验可以为国产XBT的规模化应用和推广提供数据支持,也可为其他型号XBT/XCTD/CTD等仪器的比测提供借鉴。 相似文献