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71.
This paper reports study on the mechanism of long-wave breaking in a one-dimensional open chan-nel,without bottom friction,or with linear bottom friction.In general,the wave breaking phenomenon is related to the notion of"blow-up of solution"and can be studied by using the blow-up theory of par-tial differential equations(PDE).A pair of Riemann invariants are introduced to transform the governingequations into ordinary differential equations(ODE)along the characteristic directions of the governingequations.From the properties of the solutions of the ODE,the time and location of wave breakingare estimated and the criterion of long-wave breaking for the case with linear bottom friction is obtained. 相似文献
72.
As it is well-known, the North Equatorial Current (NEC) bifurcates into the Kuroshio flowing northward and the equatorward Mindanao Current, which is well depicted by Munk’s theory in 1950 in terms of its climatology. However, Munk’s theory is unable to tell the NEC bifurcation variability with time. In the present paper, a time-dependent baroclinic model forced by wind, in which temporal and baroclinic terms are added to Munk’s equation, is proposed to examine the seasonal variability of the NEC bifurcation latitude. An analytical solution is obtained, with which the seasonal variability can be well described: NEC bifurcation reaches its northernmost position in December and its southernmost position in June with a range of about 1° in latitude, consistent with previous results with observations. The present solution will degenerate to Munk’s one in the case of steady and barotropic state. 相似文献
73.
We investigate the influence of low-frequency Rossby waves on the thermal structure of the upper southwestern tropical Indian
Ocean (SWTIO) using Argo profiles, satellite altimetric data, sea surface temperature, wind field data and the theory of linear
vertical normal mode decomposition. Our results show that the SWTIO is generally dominated by the first baroclinic mode motion.
As strong downwelling Rossby waves reach the SWTIO, the contribution of the second baroclinic mode motion in this region can
be increased mainly because of the reduction in the vertical stratification of the upper layer above thermocline, and the
enhancement in the vertical stratification of the lower layer under thermocline also contributes to it. The vertical displacement
of each isothermal is enlarged and the thermal structure of the upper level is modulated, which is indicative of strong vertical
mixing. However, the cold Rossby waves increase the vertical stratification of the upper level, restricting the variability
related to the second baroclinic mode. On the other hand, during decaying phase of warm Rossby waves, Ekman upwelling and
advection processes associated with the surface cyclonic wind circulation can restrain the downwelling processes, carrying
the relatively colder water to the near-surface, which results in an out-of-phase phenomenon between sea surface temperature
anomaly (SSTA) and sea surface height anomaly (SSHA) in the SWTIO. 相似文献
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77.
黄海夏季近岸海区环流的初步分析及其与风速的关系 总被引:14,自引:5,他引:9
2008年夏季,青岛近海海域浒苔大规模暴发,引起人们对黄海夏季近海环流的特别关注。该文通过分析江苏外海一个观测站点上的近26 d的夏季海流观测资料,发现这里存在一支流向比较稳定的北向流,垂向平均流速约3.4 cm/s,最大流速8 cm/s。研究表明,该北向流的变化主要受局地风场控制,南北向的流动与南北向风速的大小关系密切。 相似文献
78.
渤、黄、东海海流和潮汐共同作用下的悬浮物输运、沉积及其季节变化 总被引:1,自引:0,他引:1
渤、黄、东海是一个水动力状况相当复杂的半封闭宽陆架海,本海区悬浮颗粒物含量高,季节变化明显,影响范围广,是世界上悬浮物含量最高的海域之一。对于该海域悬浮物的输运沉积过程、分布规律以及底质分布等中外学者均进行过比较深入的研究(秦蕴珊,1963;Honjo et al.,1974;Milliman et al.,1985,1986;秦蕴珊等,1987,1989;杨作升等,1992;Li et al.,1997;孙效功等,2000;雷坤等,2001)。然而,以往的研究大都基于实际海洋调查资料,由于受实测资料在时间和空间覆盖范围上的限制,很难从整体上把握渤、黄、东海陆架区悬浮物输运的时间和空间变化规律。数值模拟的方法能很好地克服上述局限,已有学者从不同角度对渤、黄、东海的某些海域的悬浮物进行了模拟研究。 相似文献
79.
上升流即海洋中持续垂直向上的海水运动,这种运动在海洋中是比较普遍的,但是,就其大小而言,却有着巨大的差异——可达几个数量级。所以,只有在那些量值较大的区域才引起人们的注意;而在量值较小的区域由于表象不够显著——对各种特征场特别是温度场的影响不太明显,往往被人们所忽视。
尽管上升流的流速与水平流速相比甚小,一般在10-5-10-2厘米/秒范围内(大约相当于每天1厘米至10米),但其作用却是巨大的。首先,就整个海洋来说,它是海洋环流不可分割的一个组成部分,是上层水与下层水沟通交换的渠道。其次,上升流在生产实践中具有十分重要的意义,它对渔业生产有着巨大的影响,它能将富含营养盐的中、下层水带到强光合作用层,为浮游植物提供充分的养料,从而促进鱼类佴料的繁殖。海洋中出现上升流的区域仅占世界整个海洋面积的1‰左右,但上升流区的渔获量却占全世界总产量的50%左右;我国浙江近海、海南岛东南水域以及汕头外海诸上升流区同时均为良好渔场。因此,沿岸上升流越来越引起人们的重视。
从现有文献来看,我国近海。在渤海、黄海、东海和南海四个海区都有上升流存在,如渤海中部、黄海冷水团区、浙江近海、汕头外海以及海南岛东南沿海等。但是,关于这一现象,除少数海洋工作者曾提及过外,至今还缺乏专门的研究。
本文旨在利用现有的海流、水温、盐度和气象资料,就浙江沿岸(见图1)上升流产生的动力来源及环流模式进行初步的分析研究,提出粗路估算上升流的方法、指标,并提出尚待进一步解决的几个问题。所用资料主要是1958-1960年全国海洋普查、1963-1966年标准断面以及我所六十年代以来(到1973年)观测的有关资料。此外,还用了国家海洋局和浙江省气象局所提供的部分海流资料及沿岸合站的水文气象资料。 相似文献
80.
A THEORETICAL SOLUTION FOR THE THERMOHALINE CIRCULATION IN THE SOUTHERN YELLOW SEA 总被引:10,自引:2,他引:10
Application of the thermocline equations in the thermocline areas and the boundary layer and the asymptotic matching techniques in each boundary in order to satisfy the surface and bottom conditions yielded a theoretical 2- D solution of the vertical thermohaline circulation of the Southern Yellow Sea in summer when the quasi-statically varying seasonal thermocline (density layer) is the background density structure , the deviations from which cause the secondary vertical circulation . The results show that the thermocline can be considered as an internal boundary or a barrier to the vertical heat advection so that in the central areas of the Southern Yellow Sea or the center of the Yellow Sea Cold Water Mass(YCWM)> the downwelling in the upper layer and upwelling in the lower or bottom layer form a double cell vertical circulation . The solution is similar to Hu's conceptual model ( 1986) in the central areas of the YCWM and is consistent with observed temperature . salinity and dissolved oxygen distri 相似文献