共查询到20条相似文献,搜索用时 62 毫秒
1.
We describe the principles of design of distributed thermoprofilometers and analyze their characteristics and the required
hardware, algorithms, and software. The capabilities of these instruments in the investigation of temperature fields, vertical
displacements, and the parameters of internal waves are evaluated. The results of measurements and numerical calculations
are presented.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
2.
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
3.
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
4.
We investigate the influence of baroclinic tidal waves on the diffusion of an impurity spot in a continuously stratified liquid.
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 the parameters of the baroclinic wave and the location of the impurity
spot.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
5.
Within the framework of the linear theory of long waves, we study internal waves generated by a barotropic tide in a two-layer
ocean of variable depth taking into account the influence of the Coriolis force. Barotropic waves run over an extended unevenness
of the bottom at an arbitrary angle. This unevenness is regarded as a model of the continental slope and shelf. We establish
the dependences of the amplitudes of generated internal waves on the angle of incidence of the barotropic tide, topography
of the bottom, and stratification.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
6.
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
7.
S. F. Dotsenko 《Physical Oceanography》2001,11(5):411-424
We perform the analysis of tsunami waves in the shelf zone of the Crimean peninsula generated by underwater earthquakes whose
epicentres are located near the lower boundary of the continental slope. For this purpose, we use a one-dimensional nonlinear
dissipative numerical model of long waves. The investigated distributions of the depth of the basin correspond to four points
of the south coast of the Crimean peninsula. We use the empirical dependences of parameters of the sources of tsunami waves
on the magnitude of the earthquake obtained earlier for the Pacific Ocean. It is shown that the height, vertical climb, and
duration of tsunami waves increase with the magnitude of the earthquake. For equal magnitudes of the earthquake, the highest
tsunamis on the south coast of the Crimea are observed between Alushta and Yalta. We also deduced a generalized regression
dependence of the height of tsunami waves near the coast on the magnitude of the earthquake.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
8.
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
9.
Within the framework of the linear theory of long waves taking into account the action of the Coriolis force, we solve the
problem of generation of internal waves by a barotropic tide impinging on a bottom irregularity of the sea-ridge type. The
cross section of the ridge is assumed to be rectangular and the stratification of the ocean is regarded as stepwise with two
thermoclines (three-layer model). We study the dependences of the characteristics of generated waves on the parameters of
stratification and the period of the impinging barotropic tide.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
10.
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
11.
S. F. Dotsenko 《Physical Oceanography》2000,10(6):485-493
We perform the numerical analysis of the intensification of tsunami waves in the course of their propagation from the open
part of the Black Sea to the shelf zone. For this purpose, we use a one-dimensional model of nonlinear long waves taking into
account the effect of bottom friction. We study four profiles of the bottom corresponding to the south coast of the Crimean
Peninsula and establish the predominant role of the bottom pattern and insignificant contribution of nonlinearity to the transformation
of waves in the process of their propagation in the direction of the coast. Down to depths of 50 m, all changes in the height
of waves are described by the Green law. For the evaluation of vertical run-up of waves, it is important to take into account
nonlinear effects. The highest vertical run-ups of waves are observed in the parts of the shelf zone located near Yalta and
Alushta.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
12.
S. A. Grodsky V. N. Kudryavtsev A. N. Bol'shakov V. E. Smolov 《Physical Oceanography》2001,11(4):333-352
On the oceanographic platform of the Marine Hydrophysical Institute of the Ukrainian National Academy of Sciences, we performedin situ investigations of surface waves based on the analysis of the fluctuations of radar signals at a wavelength of 1.2 cm. We
analyzed both the traditional modulation transfer function used to describe variations of the scattering cross section for
the scales of surface waves and the correlation of mean variations of the level of radar signals with the group structure
of waving. This is of interest for applications in medium-resolution radar systems (−200–500m) recording the group structure
of waving in the process of its smoothing. The experimental estimations of the amplitude of variations of radar signals caused
by the group structure of waving are in good agreement with numerical results obtained with the help of a two-scale model
of scattering of radar signals by the sea surface.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
13.
N. A. Panteleev 《Physical Oceanography》1999,9(6):405-416
We present an analytic survey of a series of works devoted to the direct methods for the investigation of turbulence in natural
basins originated under the guidance of A. G. Kolesnikov in the 50s. We describe the principal results of the early stage
which formed the basis for future investigations. The main scientific directions of the latest period are also considered
from the viewpoint of the development of Kolesnikov's ideas: investigation of the processes of generation and energy supply
of small-scale turbulence, relationship between turbulence and the fine vertical structure and internal waves, and the mechanisms
of vertical turbulent exchange in the ocean. A model of vertical exchange under the conditions of intermittent “source” turbulence
is distinguished. We also discuss the directions of development and prospects of the investigation of turbulence.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
14.
We study the influence of floating broken ice on the mean nonzero displacements of liquid particles in nonlinear running surface
waves. The analysis is performed on the basis of a uniform asymptotic expansion (up to the quantities of the third order of
smallness as compared with the potential of the velocity of motion of liquid in a basin of finite depth) obtained by the method
of multiple scales.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
15.
We study the procedures aimed at decreasing the dynamic errors of the evaluation of salinity with the help ofCTD-probes by reducing the difference between the amplitude-phase characteristics of temperature and conductivity sensors. This
is attained by introducing a delay between the times of scanning the sensors. To make the amplitude characteristics as close
as possible, we propose to use temperature sensors distributed in the direction of probing. We present the procedures used
to determine the optimal parameters of temperature sensors and the length of time delay. The advantages of the proposed method
are demonstrated by analyzing a numerical example.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
16.
We analyze oscillations of the Black Sea level at 43 points in the north part of the coast. At some points, the data of every-day
measurements are accumulated for more than 100 years. Actually, at all points with minor exceptions, we observe a general
trend toward an increase in the sea level. The amplitude of oscillations of the sea level about the average trend obeys a
normal distribution. We determine numerical characteristics of this distribution.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
17.
We analyze the influence of a rift in an ice field on the propagation of flexural gravitational waves in a basin of finite
constant depth. The ice cover is simulated by two floating semiinfinite elastic plates of different thickness. We studied
the dependence of the amplitude coefficients of reflection and transmission of waves incident on the rift on the frequency
of running waves, the thickness of ice on both sides of the rift, and the type of contact boundary conditions at the rift.
Translated by Peter V. Malyshev and Dmitry, V. Malyshev 相似文献
18.
V. F. Ivanov 《Physical Oceanography》2001,11(5):425-437
On the basis of a nonlinear model taking into account viscosity, density diffusion, and currents, we perform the numerical
analysis of propagation of perturbations formed in the abyssal part of the Black Sea as a result of the action of tangential
wind stresses or density flows in the form of a strip on the sea surface. It is shown that, in the course of time, in the
region of the bottom slope, these perturbations generate a train of waves in the sea, which causes oscillations of the fields
of density and currents. There are some differences between the generation of internal waves by the flows of density and the
wind. Unlike the wind action, in the presence of flows of density in the upper layer in the region of the strip, the initial
period of generation is characterized by the formation of intense perturbations without train structure.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
19.
S. F. Dotsenko 《Physical Oceanography》2000,10(4):287-295
Within the framework of the general linear statement of the problem, we determine the conditions of generation of a geostrophic
current in a layer of uniform rotating fluid for small displacements of the bottom of a basin. We deduce an equation relating
the equilibrium shape of the surface of the fluid with residual deformations of the bottom and find its general solution.
It is shown that the geostrophic current is generated only in the presence of residual deformations. We present numerical
estimates of the intensity of the generated geostrophic formation for a model of motion of the bottom. The investigated mechanism
of generation of geostrophic vortex fields is especially efficient in the shelf zone of the ocean.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
20.
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