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I. N. Ivanova O. N. Mel’nikova T. A. Nivina K. V. Pokazeev 《Izvestiya Atmospheric and Oceanic Physics》2006,42(5):646-652
The air-flow velocity field near the water surface is studied in the zone of wind-wave intensification. Caused by a periodic separation of eddies, a nonzero time-averaged value of the wind velocity in the near-water streamline is detected at the leading slope of the wave. The distribution of pressure along the wave with allowance for the vertical velocity shear and disturbances produced by eddies and a periodic deceleration of the viscous layer was calculated with the aid of the Cauchy-Lagrange integral. This procedure made it possible to calculate the growth rate of the wave amplitude, whose value was found to be close to its experimental value at the initial stage of acceleration. 相似文献
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Anisimova E. P. Beloyarov S. G. Pokazeev K. V. Speranskaya A. A. 《Physical Oceanography》2003,13(2):116-122
We present the results of the analysis of the energy balance in a wind–water system under the conditions of developing waves. Our investigation is based on the use of the experimental data obtained in a water channel and taken from the literature. We propose an expression for the energy balance between the air flow and wavy water surface based on the data of simultaneous measurements of the vertical wind profiles and drift currents and the parameters of waves for various fetches and indifferent density stratification. 相似文献
3.
The intensification of gentle plane waves at the initial stage of their generation by a steady wind flow in a laboratory setup is investigated. It is found that the wave form is changed by eddies that are formed in the viscous layer of a steady air flow on the leeward slope: the water surface rises under the action of eddies to form a complexly shaped slope. Calculated and measured data for gentle nonlinear waves on clean water are in good compliance with each other. It is shown that, in the presence of an oil film, the region of eddy separation encompasses the wave trough as well, because oil flows down and the film is thickened in passing from the slope to the trough. The water-surface rise by eddies in the trough restricts an increase in the amplitude and steepness of the wave. 相似文献
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Considered are the regularities of development of a current system including a density flow and the currents caused by internal
seiches in a bay. Given is the analysis of the revealed impact of this current system, found in Petrozavodsk Bay of Lake Onega,
on the suspended solid material transport and turbidity cloud formation. Verified are proposed calculation techniques of the
current velocity distribution and suspended solid material concentration. 相似文献
5.
E. P. Anisimova K. V. Pokazeev N. I. Soboleva A. A. Speranskaya O. A. Speranskaya 《Water Resources》2005,32(3):265-269
The results of studying the vertical profile of wind velocity and the vortex-formation mechanism in the atmospheric layer immediately adjacent to the water surface under the condition of developing wind wave are considered. Materials of field and laboratory experiments are used.__________Translated from Vodnye Resursy, Vol. 32, No. 3, 2005, pp. 295–300.Original Russian Text Copyright © 2005 by Anisimova, Pokazeev, Soboleva, A. Speranskaya, O. Speranskaya. 相似文献
6.
O.?N.?Mel’nikovaEmail author K.?V.?Pokazeev 《Izvestiya Atmospheric and Oceanic Physics》2018,54(1):39-46
The results of experimental studies of the interaction between the horseshoe vortices formed in nonuniform water flows and a sand surface are presented. The central part of the initial cylindrical vortex ascends, driven by the Kutta—Joukowski force. The vortex tails submerged into sand approach each other, grabbing the sand by their ends. Sharp bends are formed at the axes of the vortex tails. If the bends occlude, a ring vortex is formed above the bends. The ring approaches the surface at an angle of 40° and moves along the flow: the angle decreases, and the radius of the ring increases. When the whole vortex reaches the water surface, it breaks, loses the entrapped sand, and forms a ridge on the bottom. 相似文献
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We present the results of investigation of the transformation of a momentum flux coming from the atmosphere into a water reservoir
and establish the relationship between the surface velocity of the drift current and the dynamic velocity of wind. For the
initial stage of the development of wind waves, we propose a dependence that enables one to determine the momentum flux spent
for an increase in the intensity of waves via the momentum flux coming into the water reservoir from the wind. The behavior
of the ratio of the momentum flux spent for the increase in the intensity of waves to the total momentum flux coming from
the atmosphere into the water is studied depending on the dimensionless fetch and age of waves. In our analysis, we used both
our own experimental data and the data available from the scientific literature.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
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