Mr. George V. Leshchev Profile

George V. Leshchev

SPIE Involvement:

Author

Publications (6)

Proceedings Article | 20 September 2020 Presentation + Paper

Experimental study of wave damping due to ice floes in application to radar remote sensing of the marginal ice zone

Stanislav Ermakov, Tatyana Lazareva, George Leshev, Darya Vostryakova

Proceedings Volume 11529, 1152909 (2020) https://doi.org/10.1117/12.2574082

KEYWORDS: Radar, Remote sensing, Wave sensors, Wave propagation, Systems modeling, Basic research

Read Abstract +

Remote sensing of wind waves propagating in the areas covered by ice at initial stages of its formation in the marginal ice zone using radar is an urging problem for mapping ice boundaries and their dynamics. Another aspect of the problem is to investigate possibilities of discrimination between the marginal ice zone and oil spills in radar imagery. This study is focused on modeling the damping of surface waves due to ice floes in laboratory and field experiment. Laboratory experiments were carried out is a container filled with pure water in order to exclude the effect of surfactant films on wave damping. The container was mounted on a vibration table, so that surface gravity-capillary waves (GCW) could be parametrically generated in the container when the amplitude of the vibrations exceeded some threshold level. The wave damping coefficient could be retrieved when measuring the threshold. The floes in experiment were modeled using thin plastic pieces of two different sizes, the relative square of the “floe” coverage of the water surface was controlled in experiment. The dependences of the damping coefficient at different relations between the surface wavelength and the floe dimensions as functions of the floe coverage area were obtained. It is obtained that the damping of gravity-capillary waves in the presence of floes comparable in size with GCW can be one to two orders of magnitude greater that the wave damping due to inextensible film. Preliminary field experiments have been conducted on the Gorky Water Reservoir using a research catamaran vessel of the Institute of Applied Physics. Plywood pieces with sizes several times smaller that the studied surface wavelengths were used as imitators of ice floes and were deployed in between the catamaran hulls. Surface waves propagating between the halls were generated mechanically by a vertically oscillating motor boat. The amplitude of attenuating surface waves due to the “plywood floes” was measured with wire gauges mounted at the bow and the stern of the catamaran. The damping distance due to ice floes obtained in the field experiment was estimated as about 10 wavelengths thus indicating that that wave suppression due to the floes was essentially stronger than the viscous wave damping for clean or contaminated water surface. Wave damping observed both in the laboratory and field experiments can be comparable with the wave damping due to crude oil/oil emulsion films, so the problem of discrimination between, e.g. grease ice and oil spills in radar imagery can be nontrivial.

Proceedings Article | 14 October 2019 Paper

Fluorescence of organic films various origin and thickness to develop a method of their remote sensing on the sea surface: laboratory studies

Alexander Molkov, George Leshchev, Tatyana Lazareva, Ivan Kapustin

Proceedings Volume 11150, 111501O (2019) https://doi.org/10.1117/12.2533256

KEYWORDS: Luminescence, Remote sensing, Ultraviolet radiation, Light sources, Spectroscopy, Signal attenuation, Natural surfaces, Fluorescence spectroscopy, LIDAR, Ocean optics

Read Abstract +

Proceedings Article | 14 October 2019 Paper

An effect of sound generation due to surfactant films on the water surface illuminated by intensive IR radiation

Alexander Molkov, Ivan Kapustin, Stanislav Ermakov, Tatyana Lazareva, George Leshchev, Irina Sergievskaya

Proceedings Volume 11150, 111501K (2019) https://doi.org/10.1117/12.2533156

KEYWORDS: Infrared radiation, Water, Infrared lasers, Remote sensing, Radiation effects, Pollution, Ocean optics, Luminescence, LIDAR, Natural surfaces

Read Abstract +

Proceedings Article | 11 October 2018 Paper

Seasonal variability of remote sensing reflectance of the Gorky reservoir

Aleksander Molkov, Elena Korchemkina, Ivan Kapustin, George Leshev, Olga Danilichevaa

Proceedings Volume 10784, 1078417 (2018) https://doi.org/10.1117/12.2325753

KEYWORDS: Remote sensing, Reflectivity, Spectroscopy, Satellites, Carbon, Minerals, Ocean optics, Water, Active optics, Optical properties

Read Abstract +

Proceedings Article | 11 October 2018 Paper

Underwater sky image as a tool for estimating some inherent optical properties of eutrophic water

Alexandr Molkov, Lev Dolin, George Leshev

Proceedings Volume 10784, 1078418 (2018) https://doi.org/10.1117/12.2325828

KEYWORDS: Absorption, Water, Optical properties, Optical filters, Scattering, Light scattering, Video, Image restoration, Tin, Data modeling

Read Abstract +

Proceedings Article | 10 October 2018 Presentation + Paper

Remote sensing of evolution of oil spills on the water surface

S. Ermakov, I. Kapustin, A. Molkov, G. Leshev, O. Danilicheva, I. Sergievskaya

Proceedings Volume 10784, 107840L (2018) https://doi.org/10.1117/12.2325745

KEYWORDS: Remote sensing, Lithium, Water, Ocean optics, Global Positioning System, Photography, Unmanned aerial vehicles, Quantitative analysis, Astatine, Process modeling

Read Abstract +

Showing 5 of 6 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years