Space-frequency dependence of the Horizontal structure of a sound field in the presence of intense internal waves

2004 ◽  
Vol 50 (2) ◽  
pp. 169-176 ◽  
Author(s):  
B. G. Katznel’son ◽  
S. A. Pereselkov
2008 ◽  
Vol 54 (3) ◽  
pp. 356-362 ◽  
Author(s):  
V. A. Zverev ◽  
G. K. Ivanova

2012 ◽  
Vol 58 (3) ◽  
pp. 312-319 ◽  
Author(s):  
V. M. Kuz’kin ◽  
A. A. Lun’kov ◽  
S. A. Pereselkov

2019 ◽  
Author(s):  
B.A. Kasatkin ◽  
S.B. Kasatkin

Приведены результаты экспериментальных исследований влияния внутренних волн на интерференционную структуру звукового поля, сформированного пограничными волнами Релея Шолте в переходной зоне шельф глубокое море. Это влияние проявляется в периодической модуляции частоты максимума спектральной плотности мощности на сонограммах звукового поля, зарегистрированных комбинированным приёмником, в инфразвуковом диапазоне частот, причём амплитуда модуляции пропорциональна частоте. Анализируется зависимость периода модуляции от взаимного расположения приёмных модулей, шумящего судна, формирующего звуковое поле дискретными составляющими вально лопастного звукоряда, и предполагаемого направления распространения внутренних волн. Отмечено, что наибольшее влияние внутренние волны оказывают на структуру вихревой составляющей вектора интенсивности.The results of experimental studies of the influence of internal waves on the interference structure of the sound field formed by the RayleighSholte boundary waves in the transition zone of the shelf deep sea are presented. This effect is manifested in the periodic modulation of the frequency of the maximum of the power spectral density in the sonograms of the sound field recorded by the combined receiver in the infrasonic frequency range, with the modulation amplitude proportional to the frequency. The dependence of the modulation period on the relative position of the receiving modules, the noisy vessel that forms the sound field by the discrete components of the vane blade scale, and the expected direction of propagation of internal waves is analyzed. It is noted that internal waves have the greatest effect on the structure of the vortex component of the intensity vector.


2007 ◽  
Vol 122 (2) ◽  
pp. 747-760 ◽  
Author(s):  
Mohsen Badiey ◽  
Boris G. Katsnelson ◽  
James F. Lynch ◽  
Serguey Pereselkov

Author(s):  
Michael Doebeli

This introductory chapter provides an overview of frequency-dependent selection—the phenomenon that the evolving population is part of the changing environment determining the evolutionary trajectory. Selection is frequency-dependent if the sign and magnitude of the correlations between heritable variation and reproductive variation change as a consequence of changes in the trait distribution that are themselves generated by such correlations. From the perspective of mathematical modeling, the realm of frequency dependence in evolution is larger than the realm of situations in which selection is not frequency dependent, because the absence of frequency dependence in a mathematical model of evolution essentially means that some parameters describing certain types of biological interactions are set to zero. Thus, in a suitable parameter space, frequency independence corresponds to the region around zero, while everything else corresponds to frequency dependence. In this way, frequency-dependent selection should therefore be considered the norm, not the exception, for evolutionary processes.


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