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Nonlinear interactions of the internal waves of a tidal period with low-frequency synoptic-scale internal waves are studied using instrumental measurements of the current in the coastal zone of the Sea of Japan. In the course of spectral analysis of the data of instrumental measurements, it is found that a maximum in the spectrum of the kinetic energy of coastal waters in the vicinity of the semidiurnal frequency ω0 is surrounded by satellite maxima whose frequencies obey the relation ω s = ω0 ± Ω, where Ω is the characteristic frequency of synoptic-scale internal waves. The spectrum of the anticyclonic current component has a similar structure in the vicinities of the frequency ω0 and its first and second harmonics. The general theory of nonlinear interactions of weakly dispersive waves is used to solve the problem of modulation and the parametric amplification of tidal internal waves in the coastal zone using low-frequency narrow-band internal waviness. As can be judged from the literature, the effect of parametric modulation of tidal internal waves by low-frequency synoptic-scale internal waves has been recorded in the coastal zone of a tidal sea for the first time. 相似文献
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A method is presented to determine the quadratic nonlinearity parameter and amplitude of low-frequency internal gravity waves
in the coastal zone of a fringing sea, based upon their propagation rate dependence on local value of pycnocline vertical
displacement produced by the waves. To test the method, the internal wave field observations in the coastal zone of the Sea
of Japan are used. The testing results show that the internal wave parameters calculated using the proposed method and the
experimental data are in a good agreement with those calculated from theoretical formulas. 相似文献
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N. A. Diansky D. V. Stepanov A. V. Gusev V. V. Novotryasov 《Izvestiya Atmospheric and Oceanic Physics》2016,52(2):207-216
Based on the numerical experiment on simulation of the Japan/East Sea (JES) water circulation response to the atmospheric forcing for 1958–2006, the analysis is made of its long-term variability in the JES Central Basin (CB). It was found that during the climatic year, the circulation remains cyclonic, strengthening in spring and weakening in autumn. The analysis of mean relative vorticity (MRV) at intermediate depths in the JES CB showed one that the spectrum of its interannual variability is formed mainly by oscillations of periods ～2, ～4 and ～5 years, and in the decadal range with ～10 and ～14 years. Along the depth, the spectral composition of MRV variability does not change, but there is a noticeable weakening of decadal variability amplitude, which does not occur with the 4- and 5-year oscillations. Using SVD-analysis, the connection is established between MRV variability, wind stress curl (WSC), as well as sensible heat flux. The strong connection between MRV and WSC is revealed in the range of 4–5 years, and in the decadal range (period is 10 years) the significant connection is with both WSC and air-sea temperature as a result of winter cooling and following deep convection. 相似文献
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Vadim Vasilevich Novotryasov Dmitry Vadimovich Stepanov Igor Olegovich Yaroshchuk 《Ocean Dynamics》2016,66(1):19-25
Observations are presented of internal undular bores (IUBs) on the Japan/East Sea coast. We found three types of IUB amplitude modulation functions. The first type (IUB1) has a leading edge, which is formed by the soliton with maximal amplitude. The second type (IUB2) has a soliton with maximal amplitude (SMA) located between the leading and trailing edges. The third type (IUB3) consists of 2–3 solitons, which have identical amplitudes. The evolution of the IUB2 from the moment of generation to the moment of maximal development was analyzed. The speed of the IUB2 approached to the phase speed of linear internal waves with a period of 12.4 h. The amplitude modulation function of the IUB2 is believed to be unique in ocean observations. Observations are discussed in the context of recently raised hypotheses concerning the evolution of IUBs in the coastal environment. 相似文献
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G. I. Dolgikh V. V. Novotryasov A. N. Samchenko I. O. Yaroshchuk 《Doklady Earth Sciences》2015,465(2):1278-1282
The existence of sedimentary waves at depths ranging from 50 to 100 m in Peter the Great Bay of the Sea of Japan has been discovered and substantiated as a result of geological and geophysical experiments. The experimental and theoretical studies have made it possible to conclude that the sedimentary waves form in the depth range specified due to processes related to the disintegration of nonlinear gravity waves. 相似文献
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Dolgikh G. I. Novotryasov V. V. Yaroshchuk I. O. Permyakov M. S. 《Doklady Earth Sciences》2018,479(1):379-383
The results of field observations of an internal undular bore that were performed in a coastal zone of constant depth in the Sea of Japan are presented. A hydrodynamic model of undular bores is discussed according to which the recorded disturbances of the water medium are an experimental prototype of strongly nonlinear (intense) internal undular bores on the pycnocline of shelf waters of Peter the Great Bay with an intensity close to the limit.
相似文献8.
This paper presents the results of processing sea-surface optical images in the coastal zone of the Sea of Japan with manifestations of internal gravity waves (IGWs) in the region of the Gamov Peninsula and the results of an analysis of IGW field observations in the same region. The following parameters of IGWs have been determined from the results of processing: their lengths and phase velocities. We calculate the IGW parameters in the region of observations using a mathematical model that takes into account the field data on the vertical stratification of coastal waters and the nonlinearity of the wave process. A comparison of the IGW parameters obtained from model calculations with the parameters obtained from the processing of optical images demonstrates a good agreement between them. 相似文献
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D. V. Stepanov N. A. Diansky V. V. Novotryasov 《Izvestiya Atmospheric and Oceanic Physics》2014,50(1):73-84
The response of circulation in the Sea of Japan (SJ) to the CORE-calculated real atmospheric forcing for 1958–2006 is reconstructed using the general ocean circulation model developed at the Institute of Computational Mathematics, Russian Academy of Sciences (ICM RAS). Features of the interannual variability of the circulation in the intermediate and deep layers of the central part of SJ are studied from the numerical simulation results. For this, the spatiotemporal variability of the relative vorticity is calculated. Frequency spectra of this variability are calculated at depths of 500 and 800 m and the layer-average between these levels. The spectra have a quasi-discrete structure with maxima in vicinities of 4–5, 7, and 10-year periods. Coincidence is ascertained between frequencies corresponding to these periods and earlier determined frequencies of the inter-annual variability of the temperature field observed in the intermediate layer of the SJ in the second half of the 20th century. 相似文献
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V. V. Novotryasov S. P. Zakharkov D. V. Stepanov 《Russian Meteorology and Hydrology》2016,41(8):564-568
The results are presented of hydrological studies in the coastal zone of the Sea of Japan in autumn in different years. It is revealed that the typical density stratification of water is formed there in autumn. The amplitudes are estimated of regular (with the periodicity of tidal harmonic M2) vertical displacements of isotherms in the intermediate layer and maximum values of flow velocity in the surface and bottom layers. It is demonstrated that temperature perturbations are induced at the shelf edge and propagate to the coastal zone with the velocity that is close to the velocity of the first mode of internal gravity waves with the frequency of the tidal harmonic M2. 相似文献
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