Transmission of wave energy through an offshore wind turbine farm

Erik Damgaard Christensen; Martin  Johnson; Ole Rene Sørensen; Charlotte Bay Hasager; Merete Badger; Søren Ejling Larsen

doi:10.1016/j.coastaleng.2013.08.004

Transmission of wave energy through an offshore wind turbine farm

Erik Damgaard Christensen, Martin Johnson, Ole Rene Sørensen, Charlotte Bay Hasager, Merete Badger, Søren Ejling Larsen

DHI Water - Environment - Health

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Abstract

The transmission of wave energy passing an offshore wind farm is studied. Three effects that can change the wave field are analysed, which is the A) energy dissipation due to drag resistance, B) wave reflection/diffraction from structures, and C) the effect of a modified wind field inside and on the lee side of the wind farm. The drag dissipation, A), is quantified by a quadratic resistance law. The effect of B) is parameterised based on 1st order potential theory. A method to find the amount of reflected and transmitted wave energy is developed based on the panel method WAMIT™ and a radiation condition at infinity. From airborne and Satellite SAR (Synthetic Aperture Radar) a model has been derived for the change of the water surface friction C) inside and on the lee side of the offshore wind farm. The effects have been implemented in a spectral wind wave model,MIKE21 SW, and a parametric study to compare the 3 different processes has been carried out. The method to study reflection/diffraction can be used for any type of offshore structure, vessel or a number of structures, as long as the assumptions for the use of potential wave theory are valid, and the effect of the modified wind field on the water surface friction is known.
© 2013 Elsevier B.V. All rights reserved.

Original language	English
Journal	Coastal Engineering
Volume	82
Pages (from-to)	25-46
ISSN	0378-3839
DOIs	https://doi.org/10.1016/j.coastaleng.2013.08.004
Publication status	Published - 2013

Keywords

Wave energy
Radiation condition
Offshore wind farm
Spectral wind wave model

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10.1016/j.coastaleng.2013.08.004

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EERA-DTOC: EERA DTOC: European Energy Research Alliance Design Tools for Offshore wind farm Clusters
Madsen, P. H. (Project Coordinator), Hasager, C. B. (Project Manager), Giebel, G. (Project Participant), Réthoré, P.-E. (Project Participant), Cutululis, N. A. (Project Participant), Badger, M. (Project Participant), Hahmann, A. N. (Project Participant), Peña, A. (Project Participant), Badger, J. (Project Participant), Volker, P. (Project Participant), Karagali, I. (Project Participant), Maule, P. (Project Participant), van der Laan, P. (Project Participant), Cutululis, N. A. (Project Participant) & Hansen, K. S. (Project Participant)
01/01/2012 → 30/06/2015
Project: Research

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title = "Transmission of wave energy through an offshore wind turbine farm",

abstract = "The transmission of wave energy passing an offshore wind farm is studied. Three effects that can change the wave field are analysed, which is the A) energy dissipation due to drag resistance, B) wave reflection/diffraction from structures, and C) the effect of a modified wind field inside and on the lee side of the wind farm. The drag dissipation, A), is quantified by a quadratic resistance law. The effect of B) is parameterised based on 1st order potential theory. A method to find the amount of reflected and transmitted wave energy is developed based on the panel method WAMIT{\texttrademark} and a radiation condition at infinity. From airborne and Satellite SAR (Synthetic Aperture Radar) a model has been derived for the change of the water surface friction C) inside and on the lee side of the offshore wind farm. The effects have been implemented in a spectral wind wave model,MIKE21 SW, and a parametric study to compare the 3 different processes has been carried out. The method to study reflection/diffraction can be used for any type of offshore structure, vessel or a number of structures, as long as the assumptions for the use of potential wave theory are valid, and the effect of the modified wind field on the water surface friction is known.{\textcopyright} 2013 Elsevier B.V. All rights reserved.",

keywords = "Wave energy, Radiation condition, Offshore wind farm, Spectral wind wave model",

author = "Christensen, {Erik Damgaard} and Martin Johnson and S{\o}rensen, {Ole Rene} and Hasager, {Charlotte Bay} and Merete Badger and Larsen, {S{\o}ren Ejling}",

year = "2013",

doi = "10.1016/j.coastaleng.2013.08.004",

language = "English",

volume = "82",

pages = "25--46",

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TY - JOUR

T1 - Transmission of wave energy through an offshore wind turbine farm

AU - Christensen, Erik Damgaard

AU - Johnson, Martin

AU - Sørensen, Ole Rene

AU - Hasager, Charlotte Bay

AU - Badger, Merete

AU - Larsen, Søren Ejling

PY - 2013

Y1 - 2013

N2 - The transmission of wave energy passing an offshore wind farm is studied. Three effects that can change the wave field are analysed, which is the A) energy dissipation due to drag resistance, B) wave reflection/diffraction from structures, and C) the effect of a modified wind field inside and on the lee side of the wind farm. The drag dissipation, A), is quantified by a quadratic resistance law. The effect of B) is parameterised based on 1st order potential theory. A method to find the amount of reflected and transmitted wave energy is developed based on the panel method WAMIT™ and a radiation condition at infinity. From airborne and Satellite SAR (Synthetic Aperture Radar) a model has been derived for the change of the water surface friction C) inside and on the lee side of the offshore wind farm. The effects have been implemented in a spectral wind wave model,MIKE21 SW, and a parametric study to compare the 3 different processes has been carried out. The method to study reflection/diffraction can be used for any type of offshore structure, vessel or a number of structures, as long as the assumptions for the use of potential wave theory are valid, and the effect of the modified wind field on the water surface friction is known.© 2013 Elsevier B.V. All rights reserved.

AB - The transmission of wave energy passing an offshore wind farm is studied. Three effects that can change the wave field are analysed, which is the A) energy dissipation due to drag resistance, B) wave reflection/diffraction from structures, and C) the effect of a modified wind field inside and on the lee side of the wind farm. The drag dissipation, A), is quantified by a quadratic resistance law. The effect of B) is parameterised based on 1st order potential theory. A method to find the amount of reflected and transmitted wave energy is developed based on the panel method WAMIT™ and a radiation condition at infinity. From airborne and Satellite SAR (Synthetic Aperture Radar) a model has been derived for the change of the water surface friction C) inside and on the lee side of the offshore wind farm. The effects have been implemented in a spectral wind wave model,MIKE21 SW, and a parametric study to compare the 3 different processes has been carried out. The method to study reflection/diffraction can be used for any type of offshore structure, vessel or a number of structures, as long as the assumptions for the use of potential wave theory are valid, and the effect of the modified wind field on the water surface friction is known.© 2013 Elsevier B.V. All rights reserved.

KW - Wave energy

KW - Radiation condition

KW - Offshore wind farm

KW - Spectral wind wave model

U2 - 10.1016/j.coastaleng.2013.08.004

DO - 10.1016/j.coastaleng.2013.08.004

M3 - Journal article

SN - 0378-3839

VL - 82

SP - 25

EP - 46

JO - Coastal Engineering

JF - Coastal Engineering

ER -

Transmission of wave energy through an offshore wind turbine farm

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Keywords

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Projects

EERA-DTOC: EERA DTOC: European Energy Research Alliance Design Tools for Offshore wind farm Clusters

Cite this