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91.
???????????????????????????鹹????????????μ?????????????????????????????????????μ??????????????????1?????????????????????????????2???????????????μ????????????γ???????£???80??????????????????????????????????????????μ???????????????60???????3??????????????????????????????????????????????????????????????????????С??????????????????μ????????????????????????4???????????????????й?????γ?????????????????????????? 相似文献
92.
利用流式细胞仪对南黄海秋季浮游病毒丰度在水平分布和垂直分布上的特征进行了研究,并分析了浮游病毒丰度与异养细菌、微微型浮游植物等宿主丰度以及环境因子的相关性.结果表明,该海区秋季浮游病毒丰度在(2.22×106)-(1.60× 107)ind/ml之间,平均值8.32×106ind/ml.病毒丰度在调查海域的东北和中南部海域出现高值区,在西南部出现低值区,且浮游病毒丰度与异养细菌丰度的平面分布趋势较一致.在表层、中层和底层水体,浮游病毒丰度平均值分别为8.63×106、7.83×106、8.49×106ind/ml,表层和底层丰度无显著差异,但均高于中层(P<0.05).相关性分析表明,浮游病毒丰度与异养细菌丰度、VBR呈显著正相关(P<0.01),与微微型真核浮游植物丰度呈显著负相关(P<0.05),与聚球藻、水深、水温、盐度、溶氧、叶绿素a浓度无明显相关性(P>0.05). 相似文献
93.
The contribution of deep-sea macrohabitat heterogeneity to global nematode diversity 总被引:1,自引:0,他引:1
《Marine Ecology》2010,31(1):6-20
94.
Francesco Lalli Antonello BruschiRodolfo Lama Luca LibertiStefania Mandrone Valeria Pesarino 《Coastal Engineering》2010
In the present paper some numerical simulations and experiments were carried out to study jet-wall interaction in shallow waters. Namely, modifications of the hydrodynamic field concerning the interaction of river run-off with a shallow coastal water body, due to the presence of marine structures, were investigated. Stratification effects due to salinity and temperature were neglected, and the interest was focused on barotropic features (Coanda effect). The numerical analysis was carried out by means of shallow water equations, numerically solved by finite difference, and the present method was validated by means of a typical simple-shaped test case. The experiments were carried out in a shallow water tank, flow visualizations were performed, and the velocity field was obtained by PIV. The main features of jet-wall interaction flow were investigated in simple-shaped geometries, and applications were shown for two practical cases: Pescara channel harbour (Adriatic Sea, Italy) and the proposed design of Latina harbour (Tyrrhenian Sea, Italy). 相似文献
95.
96.
大陆岩石圈研究进展 总被引:5,自引:0,他引:5
从地震学、地球化学、岩石学等不同学科的角度,对大陆岩石圈研究进展做了简要介绍。不同学科的最新研究成果表明,岩石圈在热状态、化学成分和力学行为等方面具有高度非均匀性。这不仅表现为岩石圈性质和结构随深度的变化,而且还反映在不同时代、大陆与海洋以及克拉通和造山带岩石圈结构特征的显著差异上。性质和结构的差异体现了岩石圈形成和长期演化过程的复杂性。我们认为,不同岩石圈块体之间、岩石圈与深部对流地幔之间普遍存在着相互作用。这种相互作用被认为是稳定克拉通岩石圈遭受改造甚至破坏的深部机制,同时还是地球深、浅部物质交换的重要方式,因而显著影响着地球深部的对流和地表的构造过程。值得注意的是,由于岩石圈本身定义的模糊性及其厚度的不确定性,地震活动与岩石圈强度之间的关系以及大陆岩石圈演化的规律性等问题仍有待于进一步的研究和探索。 相似文献
97.
This work addresses the linear dynamics underlying the formation of density interfaces at the periphery of energetic vortices, well outside the vortex core, both in the radial and axial directions. We compute numerically the unstable modes of an anticyclonic Gaussian vortex lens in a continuously stratified rotating fluid. The most unstable mode is a slow mode, associated with a critical layer instability located at the vortex periphery. Although the most unstable disturbance has a characteristic vertical scale which is comparable to the vortex height, interestingly, the critical levels of the successively fastest growing modes are closely spaced at intervals along the axial direction that are much smaller than the vortex height. 相似文献
98.
The deflection, at a step-shelf fronted coast, of a constant potential vorticity current in a reduced-gravity, inviscid model ocean is studied theoretically. The step shelf, with a depth smaller than the reservoir depth, forces the uplifting of the approaching current and causes water column foreshortening, leading to relative vorticity generation that enhances current deflection to the right (facing the coast). As a consequence, in comparison to the case of a vertical wall coast, the proportion of the transport to the right is increased. For normal incidence for a shelf-depth/reservoir-depth ratio of 0.3 and shelf width to deformation radius ratio of 1.5, more than 90% of the approaching current transport goes to the right and less than 10% to the left. In addition, the (barotropic) dynamic pressure at the coast is low to the right and high to the left (with the highest pressure at the stagnation point). In the vertical wall case, the wall pressures on the flank are equal. For oblique incidence from the left, the deflection to the left is drastically reduced. In fact, there is practically no steady-state flow diverted to the left (less than 2%) when the approach angle is greater than 60° to the left of normal. In the vertical wall case, the same angle would have to be 90° for the flow to the left to vanish, namely only when the approach current is parallel to the coast to the right. 相似文献
99.
Arthur Frankel 《Pure and Applied Geophysics》1989,131(4):639-685
This paper reviews applications of the finite-difference and finite-element methods to the study of seismic wave scattering in both simple and complex velocity models. These numerical simulations have improved our understanding of seismic scattering in portions of the earth where there is significant lateral heterogeneity, such as the crust. The methods propagate complete seismic wavefields through highly complex media and include multiply scattered waves and converted phases (e.g.,P toSV, SV toP, body wave to surface wave). The numerical methods have been especially useful in cases of moderate and strong scattering in complex media where multiple scattering becomes important. Progress has been made with numerical methods in understanding how near-surface, low-velocity basin structures scatter surface waves and vertically-incident body waves. The numerical methods have proven useful in evaluating scattering of surface waves and body waves from topography of both the free surface and interfaces buried at depth. Numerical studies have demonstrated the importance of conversions from body waves to surface waves (andvice versa) when lateral heterogeneities and topographic relief are present in the uppermost crust. Recently, several investigations have applied numerical methods to study seismic wave propagation in velocity models which vary randomly in space. This stochastic approach seeks to understand the effects of small-scale complexity in the earth which cannot be resolved deterministically. These experiments have quantified the relationships between the statistical properties of the random heterogeneity and the measurable properties of high-frequency (1 Hz) seismograms. These simulations have been applied to the study of many features observed in actual high-frequency seismic waves, including: the amplitude and time decay of seismic coda, the apparent attenuation from scattering, the dispersion of waveforms, and the travel time and waveform variations across arrays of receivers. 相似文献
100.