A.S.Zapevalov Influence of the long surface waves on a resonant back scattering of acoustic radiation |
Acoustic bulletin, Vol. 9 ¹ 3, (2006) |
| The paper deals with transformation of the Bragg scattering coefficient for high-frequency acoustic radiation at the ocean-atmosphere interface due to long (in comparison with the Bragg components) surface waves. The numerical estimations of the allowances for scattering coefficient determined by the local variations of the angle of incidence caused by long waves are obtained for different wind velocities. It is shown that in the case of scattering on the short gravitational-capillary waves at strong winds, the allowance value can exceed 100 %. Moreover, the secondary order allowance estimations, which are determined by skewness slope distribution, have been obtained. The analysis was conducted using measurement data for the sea surface slopes obtained in the experiments at oceanographic platform of the Marine Hydrophysical Institute of NAS of Ukraine. |
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KEY WORDS: the Bragg scattering of radiation, gravitational-capillary waves, wind velocity, surface slope |
| TEXT LANGUAGE: Russian |