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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 2, pp. 176-183

The influence of water temperature on viscoelastic properties of oil films in application to remote sensing

I.A. Sergievskaya 1, 2 , T.N. Lazareva 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Volga State University of Water Transport, Nizhny Novgorod, Russia
Accepted: 11.03.2020
DOI: 10.21046/2070-7401-2020-17-2-176-183
The paper presents the results of our laboratory measurements of wave damping coefficient on water surface covered by films of crude oil, kerosene and diesel fuel with thickness from hundredths to several millimeters. The temperature of water and air varied from 1 to 25 ºC, the wave frequencies were 10–27 Hz, which corresponds to Bragg wavelength of X-band radar at moderate incidence angles. The method of parametric wave was used, which made it possible to measure the threshold acceleration at which surface waves were generated and the wavelength at a given wave frequency and to calculate the wave damping coefficient. The obtained results show that the damping coefficient of centimeter waves increases when the temperature decreases at all film thicknesses and wave frequencies. The retrieved elasticity of the films is practically independent of wave frequency and increases with temperature decrease. Using a physical model of wind wave spectrum, which takes into account both free and bound surface waves, the influence of water and air temperature on the spectral contrast of waves (the ratio of spectral intensity on clean and contaminated surfaces) was analyzed. It was shown that the radar contrast in the Bragg approximation in oil slicks at the temperature of about 25 ºC can be several times less than the contrast at the temperature of 2–4 ºC. The effect is significant for wavelengths of the order of several centimeters.
Keywords: crude oil, diesel fuel, kerosene, wave damping, elasticity, ambient temperature
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