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1.
We study the influence of baroclinic tidal waves on the diffusion of an impurity spot in a continuously stratified fluid.
The equation of turbulent diffusion is solved numerically by taking into account the wave currents. We establish the dependences
of the characteristics of the diffusion process on parameters of baroclinic waves and the location of the impurity spot.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
2.
V. L. Dorofeev 《Physical Oceanography》2000,11(2):117-131
Within the framework of a two-layer model, we consider the process of, formation of livel in a closed basin under the action
of a source with constant flow rate located on its boundary in the upper layer. The response of the level of the basin to
the inflow of liquid is observed in the form of the baroclinic and barotropic modes. The baroclinic mode, has the form of
an edge wave for which the deviation of level is positive for the upper layer and negative for the lower layer. The barotropic
component of the level is almost spatially homogeneous and its intensity increases with time. The increase in the volume of
the upper layer caused by the inflow of liquid on the boundary is almost completely attained in the barotropic mode. In the
lower layer, the increase in the volume attained in the barotropic mode is completely compensated by the baroclinic edge wave.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
3.
A. S. Boguslavsky 《Physical Oceanography》1999,10(1):93-97
We solve a nonlinear problem of diffusion from a concentrated source in a moving medium with diffusion coefficient depending
on the scale of the phenomenon, time, and the concentration of impurities. We obtain a family of exact solutions of this problem,
which can be regarded as a generalization of the class of linear problems of diffusion considered earlier for the conditions
of the ocean and atmosphere by Roberts, Ozmidov, Obukhov,et al.
Translated by Peter V. Malyshev and Dmitry V. Malyshev. 相似文献
4.
N. P. Bulgakov S. N. Bulgakov V. N. Davydova A. Z. Martinez 《Physical Oceanography》2000,10(3):233-243
On the basis of the data of thein situ measurements of current velocities and other basic hydrophysical parameters (temperature and salinity) performed in the course
of Cruise 41 of the R/VAkademik Vernadsky, we analyze the variability and stability of the North Brazil Current in winter. We also study the possibility of the influence
of the baroclinic component of the horizontal drop of hydrostatic pressure on the vertical profile of the current velocity
and estimate the intensity of the transport of waters.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
5.
Surface gravity waves formed in the process of motion of an ellipsoidal body submerged in the liquid
O. V. Avramenko 《Physical Oceanography》2000,10(6):533-540
We study the problem of flow around an ellipsoidal body submerged in a liquid half space and obtain the solution for the free
wave surface. The results of numerical analysis reveal the existence of a great variety of modes of motion characterized by
substantially different shapes of the free surface.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
6.
A. A. Slepyshev 《Physical Oceanography》2000,10(5):401-418
In the Boussinesq approximation, we study baroclinic topographic waves trapped by the flat meridional slope. The existence
of these waves is explained by stratification, inclined bottom, and Earth's rotation. We deduce the evolutionary equation
for the square of the envelope of a narrow-band wave packet of trapped waves. In the second order of smallness relative to
the wave amplitude, we find the mean fields of velocity and density induced by the packet. It is shown that, in the limiting
case of weakly nonlinear plane waves, the induced current is zonal. In the Northern hemisphere, depending on the slope of
the bottom γ1, the sign of the phase velocity σ/k (k is the zonal wave number) is either always positive (for γ1>γ1cr) or always negative (for γ1<γ1cr). If we neglect the vertical component of the Coriolis acceleration, then γ1cr=0.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
7.
We discuss the results of numerical experiments modelling the process of propagation of passive impurities from the Karantinnaya
Bay caused by steady wind currents and turbulent diffusion. The currents are computed according to the Felzenbaum model for
the cases of northeast and north-west winds [1, 2]. We analyse specific features of the space and time distribution of the
impurities caused by the three-dimensional character of the currents.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
8.
V. F. Ivanov 《Physical Oceanography》2001,11(3):205-219
For various stratifications and different types of bottom patterns we study the transformations of solitary perturbations
of density appearing in the depth of the sea. In the two-dimensional case, under the assumption that the average dynamic characteristics
weakly vary in time as compared with the wave characteristics, we deduce the equations for mean currents and waves taking
into account vertical and horizontal viscosity and the diffusion of density. Numerical examples show that the stratification,
bottom topography, nonlinearity, mean currents, and dissipation strongly affect both the process of splitting of a solitary
wave into wave trains and their amplitude and length. The wave currents exhibit the oscillatory (train-like) character. It
is emphasized that, in the case of propagation of solitary perturbations of density with dissipation, it is also important
to take into account the combined influence of nonlinearity, currents, bottom topography, and stratification.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
9.
In the coastal zone, as a result of mixing of waters, it is difficult to identify turbulent phenomena with a spatial scale
of 0.1–1 km accompanied by strong vertical flows according to the data of measuring temperature. On the basis of the data
of direct measurements, it is shown that turbulent structures are well pronounced in the field of breaking of wind waves.
We deduce empirical estimates of the response of the intensity of wave breaking to the magnitude of divergence of the current
and develop a theoretical model of the influence of inhomogeneities of currents on wave breaking capable of describing the
experimental data.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
10.
Internal waves generated by a barotropic wave impinging on a bottom ridge with continuously varying height are studied within
the framework of the linear theory of long waves. We consider the case where the diurnal tide travels at an arbitrary angle
to the axis of the ridge located in the area of a geostrophic flow caused by tilting of the free sea surface and the interface
of a two-layer ocean. We study the dependences of the amplitudes of internal waves on the velocity of the geostrophic flow,
the direction of propagation of the barotropic tide, and the geometry of the ridge.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
11.
Free waves (seiches) in a circular basin of variable depth are studied numerically within the framework of the linear theory
of long waves taking into account the action of the Coriolis force. We determine the frequencies of axisymmetric and circular
waves, study the structure of the modes of elevation of the free surface and wave velocities, and establish the dependences
of the phase velocities of circular waves on the number of mode and wavelength.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
12.
G. K. Korotaev 《Physical Oceanography》2000,10(6):495-502
We consider the problem of geostrophic adjustment of nonlinear axially symmetric formations in a two-layer fluid with infinitely
deep lower layer and demonstrate the existence of a new integral of motion, which enables us to determine the final equilibrium
state of perturbations without analyzing the transient (wave) stage of the process. It is shown that the final motions caused
by initial perturbations of the opposite signs are not equivalent.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
13.
We describe a differential approach to the spectral composition of thin thermohaline inhomogeneities in the ocean depending
on the mechanisms responsible for their generation and demonstrate the possibilities of this approach in getting realistic
hydrophysical results. The statistical classification of fine-structure fluctuations according to their origin is performed
on the basis of the joint analysis of the temperature, salinity, and density spectra computed in a section of the vertical
profile where the variation of mean gradients of all three parameters is insignificant. On the basis of the constructed mean
spectrum of wave elevations, we estimate the dissipative characteristics of the convection of salt fingers and small-scale
internal waves.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
14.
The paper studies the effect of the baroclinic tidal wave on the diffusion of a patch of impurities in a continuously stratified
fluid. The turbulent diffusion equation is solved numerically, with wave currents being considered. The diffusion characteristics
depend upon the parameters of a baroclinic wave and upon the location of the patch.
Translated by Vladimir A. Puchkin. 相似文献
15.
We consider long barotropic waves in a system of two rectangular basins connected by a channel in the case where waves are
generated by the moving region of disturbances of atmospheric pressure passing above one of the basins. By using a numerical
model, we compute the characteristics of the wave process for various values of the parameters of this system. The results
of numerical calculations are compared with the corresponding characteristics obtained for the case of a closed basin. We
also analyze the distinctive features of long-wave processes induced in the presence of the channel.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
16.
Within the framework of the linear theory of long waves, we study the evolution of a wave process caused by the action of
surface pressure periodically varying in time in a bounded basin of variable depth without vertical walls. We assume that
the basin is filled with a homogeneous liquid nonperturbed at the initial time and take into account the action of dissipative
forces. We obtain the analytic solution of the posed problem. It is used to perform the detailed analysis of the influence
of the dissipative forces and the frequency of perturbing pressure on the characteristics of the process of evolution of waves.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
17.
We perform the theoretical analysis of the turbulent diffusion of impurities in the sea in the presence of long waves. The role of generators of long-wave motions is played by moving cyclonic baric formations. At the initial time, the zone of pollution is specified in the form of a spot of a passive substance localized near the Karkinitskii Bay in the Black Sea. The results of our investigations enable us to estimate the contribution of long waves to the process of diffusion of the spot of impurity depending on the trajectory of motion of the cyclonic formation. It is shown that, under the action of waves induced by the cyclone, the maximum concentration in the spot decreases more rapidly only for a certain period of time. Moreover, we observe a northwest displacement of the spot specified by the structure of the wave field.Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 3–18, July–August, 2004. 相似文献
18.
Within the framework of the linear theory of long waves, we perform the numerical investigation of transformations of a barotropic
diurnal tide in the process of its motion from the deepwater region of the sea into the region of continental slope and shelf
zone at any angle to the coast line. For a linear profile of the bottom of the continental slope and shelf, we establish dependences
of the amplitudes and velocities of waves on the direction of propagation of the tidal wave and the latitude of the place.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
19.
V. I. Man’kovsky 《Physical Oceanography》2001,11(5):491-494
We present the parameters of empirical relationships between the depth of visibility of Secchi disk and optical and biological
characteristics of the Black-Sea surface waters.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
20.
O. I. Efremov 《Physical Oceanography》2000,10(3):193-204
A method of statistical separation of fine-structure fluctuations according to their origin is applied to the analysis of
the characteristics of mixing in a layer located below the summer temperature minimum in the Black Sea. The simplification
of the procedure of numerical evaluation of the coefficient of vertical wave exchange enabled us to perform the comprehensive
fine-structure processing of the data of regular surveys of the Black Sea with an aim to determine the spatial distribution
of the field intensity of small-scale internal waves and the intensity of mixing caused by these waves in the analyzed layer.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献