dc.contributor.author |
Cheynet, E. |
dc.contributor.author |
Jakobsen, J.B. |
dc.contributor.author |
Snæbjörnsson, J. |
dc.contributor.author |
Mann, J. |
dc.contributor.author |
Courtney, M. |
dc.contributor.author |
Lea, G. |
dc.contributor.author |
Svardal, B. |
dc.date.accessioned |
2023-06-23T02:19:39Z |
dc.date.available |
2023-06-23T02:19:39Z |
dc.date.issued |
2017-09-21 |
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 awide norwegian fjord using synchronized long-range doppler wind lidars ' , Remote Sensing , vol. 9 , no. 10 . https://doi.org/10.3390/rs9100977 |
dc.identifier.issn |
2072-4292 |
dc.identifier.other |
143495667 |
dc.identifier.other |
fdd3cea6-6a96-4040-99d2-4e88943035ff |
dc.identifier.other |
ORCID: /0000-0003-4391-9925/work/81132044 |
dc.identifier.other |
85032871861 |
dc.identifier.other |
researchoutputwizard: hdl.handle.net/20.500.11815/1622 |
dc.identifier.other |
Core: 289151801 |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/4340 |
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 Bjornafjord 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 25m above the sea surface, at scanning distances up to 4.6km. For a mean wind velocity above 8m.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 0.02m(-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 10m.s(-1) and 14m.s(-1), which may be related to a stable atmospheric stratification. |
dc.format.extent |
977 |
dc.format.extent |
887827 |
dc.format.extent |
|
dc.language.iso |
|
dc.relation.ispartofseries |
Remote Sensing; 9(10) |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Wind coherence |
dc.subject |
Turbulence spectrum |
dc.subject |
Pulsed lidar |
dc.subject |
Full-scale measurements |
dc.subject |
WindScanner system |
dc.subject |
Bridges |
dc.subject |
Vindmælingar |
dc.subject |
Vindálag |
dc.subject |
Vatnsborð |
dc.subject |
Brýr |
dc.subject |
Byggingarverkfræði |
dc.subject |
Norway |
dc.subject |
Noregur |
dc.subject |
Wind coherence |
dc.subject |
Turbulence spectrum |
dc.subject |
Pulsed lidar |
dc.subject |
Full-scale measurements |
dc.subject |
WindScanner system |
dc.subject |
Bridges |
dc.subject |
Vindmælingar |
dc.subject |
Vindálag |
dc.subject |
Vatnsborð |
dc.subject |
Brýr |
dc.subject |
Byggingarverkfræði |
dc.subject |
Norway |
dc.subject |
Noregur |
dc.title |
Measurements of surface-layer turbulence in awide norwegian fjord using synchronized long-range doppler wind lidars |
dc.type |
/dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article |
dc.description.version |
Peer reviewed |
dc.identifier.doi |
10.3390/rs9100977 |
dc.relation.url |
http://www.scopus.com/inward/record.url?eid=2-s2.0-85032871861&partnerID=MN8TOARS |
dc.contributor.department |
Verkfræðideild |