Spectral evolution of wind generated surface gravity waves in a dispersed ice field
The Marginal Ice Zone includes wide areas covered by dispersed ice floes in which wave conditions are significantly affected by the ice. When the wind blows from the solid ice pack, towards the open sea, growing waves are scattered by the floes, their spectral characteristics being modified. To furt...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
University of British Columbia
1987
|
Subjects: | |
Online Access: | http://hdl.handle.net/2429/29020 |
id |
ftunivbritcolcir:oai:circle.library.ubc.ca:2429/29020 |
---|---|
record_format |
openpolar |
spelling |
ftunivbritcolcir:oai:circle.library.ubc.ca:2429/29020 2023-05-15T16:39:31+02:00 Spectral evolution of wind generated surface gravity waves in a dispersed ice field Masson, Diane 1987 http://hdl.handle.net/2429/29020 eng eng University of British Columbia For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. Wind waves Sea ice Text Thesis/Dissertation 1987 ftunivbritcolcir 2019-10-15T18:00:09Z The Marginal Ice Zone includes wide areas covered by dispersed ice floes in which wave conditions are significantly affected by the ice. When the wind blows from the solid ice pack, towards the open sea, growing waves are scattered by the floes, their spectral characteristics being modified. To further understand this problem, a model for the evolution of wind waves in a sparse field of ice floes was developed. The sea state is described by a two-dimensional discrete spectrum. Time-limited wave growth is obtained by numerical integration of the energy balance equation using the exact nonlinear transfer integral. Wave scattering by a single floe is represented in terms of far-field expressions of the diffracted and forced potentials obtained numerically by the Green's function method. The combined effect of a homogeneous field of floes on the wave spectrum is expressed in terms of the Foldy-Twersky integral equations under the assumption of single scattering. The results show a strong dependence of the spectrum amplitude and directional properties on the ratio of the ice floe diameter to the wavelength. For a certain range of this parameter, the ice cover appears to be very effective in dispersing the energy; the wave spectrum rapidly tends to isotropy, limiting its growth both for the energy content and the peak frequency. It is therefore unlikely that an offshore wind blowing over the Marginal Ice Zone would generate a significant wave field. Science, Faculty of Earth, Ocean and Atmospheric Sciences, Department of Graduate Thesis ice pack Sea ice University of British Columbia: cIRcle - UBC's Information Repository |
institution |
Open Polar |
collection |
University of British Columbia: cIRcle - UBC's Information Repository |
op_collection_id |
ftunivbritcolcir |
language |
English |
topic |
Wind waves Sea ice |
spellingShingle |
Wind waves Sea ice Masson, Diane Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
topic_facet |
Wind waves Sea ice |
description |
The Marginal Ice Zone includes wide areas covered by dispersed ice floes in which wave conditions are significantly affected by the ice. When the wind blows from the solid ice pack, towards the open sea, growing waves are scattered by the floes, their spectral characteristics being modified. To further understand this problem, a model for the evolution of wind waves in a sparse field of ice floes was developed. The sea state is described by a two-dimensional discrete spectrum. Time-limited wave growth is obtained by numerical integration of the energy balance equation using the exact nonlinear transfer integral. Wave scattering by a single floe is represented in terms of far-field expressions of the diffracted and forced potentials obtained numerically by the Green's function method. The combined effect of a homogeneous field of floes on the wave spectrum is expressed in terms of the Foldy-Twersky integral equations under the assumption of single scattering. The results show a strong dependence of the spectrum amplitude and directional properties on the ratio of the ice floe diameter to the wavelength. For a certain range of this parameter, the ice cover appears to be very effective in dispersing the energy; the wave spectrum rapidly tends to isotropy, limiting its growth both for the energy content and the peak frequency. It is therefore unlikely that an offshore wind blowing over the Marginal Ice Zone would generate a significant wave field. Science, Faculty of Earth, Ocean and Atmospheric Sciences, Department of Graduate |
format |
Thesis |
author |
Masson, Diane |
author_facet |
Masson, Diane |
author_sort |
Masson, Diane |
title |
Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
title_short |
Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
title_full |
Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
title_fullStr |
Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
title_full_unstemmed |
Spectral evolution of wind generated surface gravity waves in a dispersed ice field |
title_sort |
spectral evolution of wind generated surface gravity waves in a dispersed ice field |
publisher |
University of British Columbia |
publishDate |
1987 |
url |
http://hdl.handle.net/2429/29020 |
genre |
ice pack Sea ice |
genre_facet |
ice pack Sea ice |
op_rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
_version_ |
1766029866574020608 |