dc.contributor.author | Cheynet, Etienne | |
dc.contributor.author | Jakobsen, Jasna Bogunovic | |
dc.contributor.author | Snæbjörnsson, Jonas Thor | |
dc.contributor.author | Mann, Jakob | |
dc.contributor.author | Courtney, Michael | |
dc.contributor.author | Lea, Guillaume | |
dc.contributor.author | Svardal, Benny | |
dc.date.accessioned | 2023-01-11T12:02:25Z | |
dc.date.available | 2023-01-11T12:02:25Z | |
dc.date.created | 2017-09-22T11:00:58Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Cheynet, E., Jakobsen, J. B., Snæbjörnsson, J., Mann, J., Courtney, M., Lea, G., & Svardal, B. (2017). Measurements of surface-layer turbulence in a wide Norwegian fjord using synchronized long-range Doppler wind LiDARs. Remote Sensing, 9(10), 977. | en_US |
dc.identifier.issn | 2072-4292 | |
dc.identifier.uri | https://hdl.handle.net/11250/3042696 | |
dc.description.abstract | Three synchronized pulsed Doppler wind lidars were deployed from May 2016 to June 2016 on the shores of a wide Norwegian fjord called Bjørnafjord to study the wind characteristics at the proposed location of a planned bridge. The purpose was to investigate the potential of using lidars to gather information on turbulence characteristics in the middle of a wide fjord. The study includes the analysis of the single-point and two-point statistics of wind turbulence, which are of major interest to estimate dynamic wind loads on structures. The horizontal wind components were measured by the intersecting scanning beams, along a line located 25 m above the sea surface, at scanning distances up to 4.6 km. For a mean wind velocity above 8 m⋅s−1, the recorded turbulence intensity was below 0.06 on average. Even though the along-beam spatial averaging leads to an underestimated turbulence intensity, such a value indicates a roughness length much lower than provided in the European standard EN 1991-1-4:2005. The normalized spectrum of the along-wind component was compared to the one provided by the Norwegian Petroleum Industry Standard and the Norwegian Handbook for bridge design N400. A good overall agreement was observed for wave-numbers below 0.02 m−1. The along-beam spatial averaging in the adopted set-up prevented a more detailed comparison at larger wave-numbers, which challenges the study of wind turbulence at scanning distances of several kilometres. The results presented illustrate the need to complement lidar data with point-measurement to reduce the uncertainties linked to the atmospheric stability and the spatial averaging of the lidar probe volume. The measured lateral coherence was associated with a decay coefficient larger than expected for the along-wind component, with a value around 21 for a mean wind velocity bounded between 10 m⋅s−1 and 14 m⋅s−1, which may be related to a stable atmospheric stratification. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | MDPI | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Measurements of Surface-Layer Turbulence in a Wide Norwegian Fjord Using Synchronized Long-Range Doppler Wind Lidars | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | The authors | en_US |
dc.subject.nsi | VDP::Teknologi: 500 | en_US |
dc.source.pagenumber | 26 | en_US |
dc.source.volume | 9 | en_US |
dc.source.journal | Remote Sensing | en_US |
dc.source.issue | 10 | en_US |
dc.identifier.doi | 10.3390/rs9100977 | |
dc.identifier.cristin | 1496868 | |
cristin.unitcode | 217,8,5,0 | |
cristin.unitname | Institutt for maskin, bygg og materialteknologi | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |