Authors: T. Thorsen, H. Naeser
Addresses: Agder University College, Faculty of Technology and Science, Grooseveien 36, N-4876 Grimstad, Norway. Agder University College, Faculty of Technology and Science, Grooseveien 36, N-4876 Grimstad, Norway
Abstract: The Ocean has a varying surface roughness where the roughness length is determined by the characteristics of the waves. In this paper, a method is established where the roughness length of the ocean is calculated from the wind speed and the fetch length. The fetch length depends on the wind direction and a case study is performed for a wind turbine exposed to wind blowing in two opposite directions: from the shore and the sea. For each case, the vertical wind speed distribution is calculated in order to study the influence that the direction of the wind has on the annual energy production. The potential for using a site-specific offshore turbine design, dependent on the prevailing wind direction, is also explored.
Keywords: ocean waves; offshore wind turbines; wind speed-calculations.
International Journal of Environment and Sustainable Development, 2002 Vol.1 No.4, pp.346-355
Available online: 16 Jul 2003 *Full-text access for editors Access for subscribers Purchase this article Comment on this article