排序方式: 共有62条查询结果,搜索用时 15 毫秒
51.
INTRODUCTIONAsoneofthemethodsenablingnumericalsolutionofdifferentialequations,thefinite differ encemethodiswidelyacceptedinthestudyofphysicaloceanography.Afinite differenceschememusthavepropertiesofconvergence ,consistencyandstabilitytoyieldusefulapproximatesolutionoftherelevantdifferentialequations.However,thepropertiesneednotbeverifiedonebyonebecausethewell knownLaxLawassuresthattheconvergenceisequivalenttothestabilityforafinitediffer enceschemewithconsistence .Twomainmethodsforstudyin… 相似文献
52.
A distinct type of nonlinear internal-wave packet, with the largest internal solitary wave in the middle of the packet, was regularly observed in the South China Sea during the Asian Seas International Acoustics Experiment in 2001. Data analysis shows that the occurrence of the distinct internal wave packet is closely related with the occurrence of lower-high internal tides; the internal tides are mixed in the experimental area and, thus, there is diurnal inequality between the heights of two neighboring internal tides. Modeling of internal tides and internal solitary waves in a shoaling situation suggests that this type of wave packet can be generated in the South China Sea by the large shoaling of internal solitary waves and internal tides. Both the internal solitary waves and the internal tides come from the direction of Luzon Strait. The initial large internal solitary waves contribute to the occurrence of the largest internal solitary wave in the middle of the packet and the waves behind the largest internal solitary wave, while the shoaling internal tides bring about the nonlinear internal waves in front of the largest internal solitary wave via interaction with the local shelf topography. 相似文献
53.
A distinct type of nonlinear internal-wave packet, with the largest internal solitary wave in the middle of the packet, was
regularly observed in the South China Sea during the Asian Seas International Acoustics Experiment in 2001. Data analysis
shows that the occurrence of the distinct internal wave packet is closely related with the occurrence of lower-high internal
tides; the internal tides are mixed in the experimental area and, thus, there is diurnal inequality between the heights of
two neighboring internal tides. Modeling of internal tides and internal solitary waves in a shoaling situation suggests that
this type of wave packet can be generated in the South China Sea by the large shoaling of internal solitary waves and internal
tides. Both the internal solitary waves and the internal tides come from the direction of Luzon Strait. The initial large
internal solitary waves contribute to the occurrence of the largest internal solitary wave in the middle of the packet and
the waves behind the largest internal solitary wave, while the shoaling internal tides bring about the nonlinear internal
waves in front of the largest internal solitary wave via interaction with the local shelf topography. 相似文献
54.
55.
56.
通过对TOGA-COARE期间的一组锚系仪器阵列资料的分析得出:在赤道西太平洋1°45′S,156°E。海域存在显著的半日潮频内波,它的水平波数(波长)、垂向波数、水平传播速度和垂向传播速度分别约为:3.3×10-2km-1(210km),-1.6×10-3m-1,2.0m/s,-3.8cm/s。波形向斜下方传播,亦即波能向斜上方传输。它在观测点西南方生成后,向东北方向传播,到达观测海区。流速矢量旋转谱水平随深度的变化呈马鞍形,低谷及深处的峰所在深度分别与南赤道流及赤道潜流的南边界所在深度大体一致。旋转椭圆主轴方位角随深度变化,在浅层(40m处)为北偏东30°,到深处(324m)转为东偏南14°。总体上呈东北方向,表明波来自西南方向。 相似文献
57.
卵形鲳鲹与布氏鲳鲹人工育苗的对比研究 总被引:1,自引:0,他引:1
分别于2002年4月、5月在广东湛江东海育苗场对卵形鲳鯵(Trachinotus ovatus)及布氏鲳鯵(Trachinotus blochii)进行了人工育苗试验,共培育出体长3~5cm鱼苗81万尾。其中布氏鲳鯵58万尾、卵形鲳鯵23万尾,成活率均达到50%以上。对试验进行了对比,统计分析显示:在培育环境相似的情况下,两种鱼在发育上无显著差异。 相似文献
58.
根据实测流速资料采用Morison公式初步计算了海洋内孤立波对桩柱的作用力和力矩。内孤立波对桩柱的作用力与表面波的作用力是明显不同的。内孤立波的作用力几乎分布在整个深度范围;它在铅直方向不但有量值变化。也有方向改变——第一模态内波的作用力在桩柱的上、下部位作用方向相反。表面波对桩柱的作用力随深度的增大较快的衰减。且深度的改变不会使作用力的方向发生变化。计算结果表明:引起2.1m/s水平流的内孤立波对桩柱产生的总作用力约相当于300m波长、18m波高的表面波的总作用力;由于海洋内孤立波能引起很大的水平流,它对海上石油平台桩柱产生的总作用力以及相对于海面的力矩是不能忽略的。因此,在海上石油平台设计中应充分重视内孤立波的作用。 相似文献
59.
SAR是一种主动式微波成像传感器,通过测量海面后向散射信号的幅值及其时间相位,能产生海面后向散射强度在海面分布的图像。这种图像能极为详细地显示出海面后向散射强度变化的细节,其分辨率为几米到几十米的数量级。此外,由于SAR工作在微波波段,即使在黑夜也能正常工作,它发射的微波可以穿透云层,因而测量不受恶劣天气的影响。这种全天候、全天时和高分辨率观测海洋的优势是可见光和红外传感器以及其他微波传感器所没有的,所以目前SAR已成为海洋观测的重要手段之一。 相似文献
60.
通过分析欧洲空间局的地球资源卫星(ERS-1/2)从1995—2010年的合成孔径雷达(SAR)图像,研究了东海内孤立波的时间分布特征,绘制了东海内孤立波的空间分布图,并且反演了个别海区内孤立波的传播速度。研究结果表明:东海内孤立波主要分布在两个海域,台湾东北部海域和长江口、杭州湾以及外舟山群岛附近海域。在这两个海域,大潮期间的强潮流有利于内孤立波的出现。在长江口及附近海域,跃层强时,内孤立波出现的概率相对较高。台湾东北部内孤立波波速约为0.6—0.8 m/s,长江口及附近海域内孤立波波速约为0.6 m/s左右。 相似文献