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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, 2023, Vol. 20, No. 1, pp. 229-241

Damping of gravity waves on fragmented ice

G.E. Khazanov 1, 2 , S.A. Ermakov 1, 2, 3 , V.A. Dobrokhotov 1, 2 , G.V. Leshchev 1, 2 , A.V. Kupaev 1 , O.A. Danilicheva 2 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
3 Volga State University of Water Transport, Nizhny Novgorod, Russia
Accepted: 12.01.2023
DOI: 10.21046/2070-7401-2023-20-1-229-241
It is well known that marginal ice zones are characterized by different forms of initial stages of ice such as, e.g., grease, pancake, fragmented ice etc. Such initial forms of ice act as surface wave absorbers and thus affect microwave radar backscattering. As a result, mapping of boundaries between solid ice and open water areas using radar may become rather complicated. The motivation of this study is to improve our understanding of the process of wave damping due to ice floes for elaboration of physical models of wave damping. The paper presents the description and results of special field experiments to study the damping of wind waves of various lengths in the presence of ice floes imitators, as well as the results of numerical simulations of the attenuation of a gravity waves in the presence of ice floes and a comparison with the results of experiments One of the interesting results of the investigated dependence of the damping coefficient on the ratio of the floe size to the wavelength, both in full-scale and in numerical experiments, was the presence of a local maximum for waves with lengths of the order of the floe size. A physical interpretation of the mechanism of damping of gravity waves in the presence of ice was given, taking into account the added mass of ice floes.
Keywords: gravity wave damping, initial stages of ice, remote sensing, added mass
Full text

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