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WAsP for offshore sites in confined coastal waters - the influence of the sea fetch

Abstract

The increasing interest in harvesting wind energy offshore requires reliable tools for the wind resource estimation at these sites. Most commonly used for wind resource predictions on land as well as offshore is the WAsP program. This program has been validated extensively for sites on land and at the coast. However, due to the lack of suitable measurements there is still a need for further validation for offshore sites. New data from ongoing measurements in the Danish Baltic Sea region are available now. The wind resources estimated from these measurements are compared to WAsP-predictions. They are found to agree well. The only deviation found is for two sites with comparable distance to the coast but with a different distribution of land. Here the measurements show slightly different wind resources which are not predicted by WAsP. Wind speed ratios of several pairs of stations are modelled with WAsP for 12 directional sectors and compared with the measurements. Deviations in the directional wind speed predictions were found to be dependent on the corresponding sea fetches: For smaller sea fetches WAsP seems to slightly overpredict the wind speed, while for long fetches of more than 30 km an underprediction is found. (au)
Authors:
Lange, B; [1]  Hoejstrup, J [2] 
  1. Risoe National Lab., Roskilde (Denmark)
  2. NEG Micon, Randers (Denmark)
Publication Date:
Mar 01, 1999
Product Type:
Conference
Report Number:
RISO-R-1114(EN); CONF-990314-
Reference Number:
SCA: 170100; PA: DK-99:001417; EDB-99:087281; SN: 99002098323
Resource Relation:
Conference: EWEC`99. European wind energy conference, Nice (France), 1-5 Mar 1999; Other Information: PBD: Mar 1999; Related Information: Is Part Of Contributions from the Department of Wind Energy and Atmospheric Physics to EWEC `99 in Nice, France; Larsen, Gunnar C.; Westermann, Kirsten; Noergaard, Per [eds.]; PB: 256 p.
Subject:
17 WIND ENERGY; OFFSHORE SITES; WIND POWER; RESOURCE ASSESSMENT; COASTAL WATERS; W CODES; WIND
OSTI ID:
679635
Research Organizations:
Risoe National Lab., Roskilde (Denmark). Wind Energy and Atmospheric Physics Dept.
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE99747779; ISBN 87-550-2542-0; TRN: DK9901417
Availability:
OSTI as DE99747779
Submitting Site:
DK
Size:
pp. 173-176
Announcement Date:

Citation Formats

Lange, B, and Hoejstrup, J. WAsP for offshore sites in confined coastal waters - the influence of the sea fetch. Denmark: N. p., 1999. Web.
Lange, B, & Hoejstrup, J. WAsP for offshore sites in confined coastal waters - the influence of the sea fetch. Denmark.
Lange, B, and Hoejstrup, J. 1999. "WAsP for offshore sites in confined coastal waters - the influence of the sea fetch." Denmark.
@misc{etde_679635,
title = {WAsP for offshore sites in confined coastal waters - the influence of the sea fetch}
author = {Lange, B, and Hoejstrup, J}
abstractNote = {The increasing interest in harvesting wind energy offshore requires reliable tools for the wind resource estimation at these sites. Most commonly used for wind resource predictions on land as well as offshore is the WAsP program. This program has been validated extensively for sites on land and at the coast. However, due to the lack of suitable measurements there is still a need for further validation for offshore sites. New data from ongoing measurements in the Danish Baltic Sea region are available now. The wind resources estimated from these measurements are compared to WAsP-predictions. They are found to agree well. The only deviation found is for two sites with comparable distance to the coast but with a different distribution of land. Here the measurements show slightly different wind resources which are not predicted by WAsP. Wind speed ratios of several pairs of stations are modelled with WAsP for 12 directional sectors and compared with the measurements. Deviations in the directional wind speed predictions were found to be dependent on the corresponding sea fetches: For smaller sea fetches WAsP seems to slightly overpredict the wind speed, while for long fetches of more than 30 km an underprediction is found. (au)}
place = {Denmark}
year = {1999}
month = {Mar}
}