Wave tank modeling of the damping of gravity waves due to ice floes in application to ocean remote sensing

Stanislav A. Ermakov; G. E. Khazanov; V. A. Dobrokhotov; D. V. Vostryakova; T. N. Lazareva

doi:10.1117/12.2600164

12 September 2021 Wave tank modeling of the damping of gravity waves due to ice floes in application to ocean remote sensing

Stanislav A. Ermakov, G. E. Khazanov, V. A. Dobrokhotov, D. V. Vostryakova, T. N. Lazareva

Author Affiliations +

Proceedings Volume 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021; 118570U (2021) https://doi.org/10.1117/12.2600164
Event: SPIE Remote Sensing, 2021, Online Only

Conference Poster

Abstract

It is well known that marginal ice zones are characterized by different forms of initial stages of ice such as, e.g., grease and fragmented ice which 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. Another aspect of the problem of wind wave damping due initial stages of ice is that the areas of strong wave damping due to ice can be erroneously interpreted as surface pollutions in radar imagery. Studies of wave damping due to ice floes are still insufficient, and relations between the floe geometry and wave damping are poorly established. 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. New wave tank experiments were carried out to investigate the damping of regular mechanically generated waves and of irregular wind waves due to drifting floe imitators (washing sponges) as well as for the case of stationary, non moving floes. Dependencies of the damping coefficient on wave frequencies for regular and wind waves for different floe sizes and different areas occupied by the floes were obtained. One of the most interesting results was that the damping coefficient indicated a local maximum when the floe size was about half the wave length. A physical interpretation of the results was given, based on the analysis of floe movement under the action of the orbital wave motion taking into account the floe added mass.

Conference Presentation

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Stanislav A. Ermakov, G. E. Khazanov, V. A. Dobrokhotov, D. V. Vostryakova, and T. N. Lazareva "Wave tank modeling of the damping of gravity waves due to ice floes in application to ocean remote sensing", Proc. SPIE 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021, 118570U (12 September 2021); https://doi.org/10.1117/12.2600164

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