UDC 537.877+532.5.013

The effect of long wind waves on reflection electromagnetic radiation from the sea surface

 

A. S. Zapevalov

Marine Hydrophysical Institute of RAS,  Kapitanskaya St., 2, Sevastopol 299011, Russia

 

The paper is received on May 28, 2019

 

Abstract. The variability of sea surface slopes which determine the level of the specular reflected signal at small sensing angles is analyzed. The effects created by waves whose length exceeds 10 m are considered. The analysis is carried out by numerical simulation using a spectral model of fully developed wind waves (model Pierson-Moskowitz), as well as models of developing wind waves (model Donelan). In the Donelan’s model, the stage of development of the field of wind waves is described by a parameter called the inverse age of the waves, equal to the ratio of the wind speed and the phase speed of the dominant waves. For the case when the wind waves are fully developed, the dependence on the wind speed of the variance of long wave slopes is constructed. The proportion of the variance of the slopes created by the waves with a length of more than 10 m, of the total variance created by all the waves that are present on the sea surface is determined. Depending on the wind speed, this proportion is from 5 % to 15 %. For the case when the wind wave is developing, it is shown that when the reverse age of the waves changes from 0.83 to 4, the dispersion of the slopes can change 2.5-3 times.

Key words: sea waves, radio waves, sea surface slopes, wind, statistical moments of the second order.

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For citation:

A. S. Zapevalov. The effect of long wind waves on reflection electromagnetic radiation from the sea surface.  Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 6. Available at http://jre.cplire.ru/jre/jun19/8/text.pdf

DOI  10.30898/1684-1719.2019.6.8