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NORCOWE has set up a scanning lidar (WINDCUBE 100S) for monitoring the wind conditions at the Lysefjord bridge site. The measurements will complement the wind velocity survey by sonic anemometers already installed on the bridge. While the sonic anemometers provide detailed information on turbulence and its spatial coordination in five measurement points, the lidar data will characterize the air flow at selected heights along the whole bridge span, several hundred meters upstream and downstream of the bridge. Additionally to horizontal crossections of the ambient flow field, three vertical planes will also be monitored.

 

Lidar scanning head and the Lysefjord bridge

 

The combined data set, from the lidar and the sonic anemometers, will give information on the mean wind speed and turbulence intensity distribution along the bridge span, which are defining for the wind loading on the bridge and the associated vibrations. The impact of the fjord topography on the wind flow conditions and the wind loading will be established as a function of wind direction.

 

Valerie Kumer and Etienne Cheynet

 

The measurement campaign seeks to investigate applicability of lidars for wind characterization in the bridge engineering framework. Remote optical sensing at the very location where a future structure is to be built could provide valuable supplement to traditional flow survey at a more elevated location on a fjord side and the nearby meteorological stations.

 

Lidar scanning head installation: Jasna Bogunović Jakobsen, Valerie Kumer and Benny Svardal

 

The pilot project in the Lysefjord fjord is supported by the Norwegian Public Road Administration (NPRA) and managed by Professor Jasna Bogunovic Jakobsen from the University of Stavanger. The lidar deployment and the data analyses are performed by Professor Joachim Reuder, PhD student Valerie Kumer from the University of Bergen, and scientist Benny Svardal from the Christian Michelsen Research. The project team also includes Etienne Cheynet, PhD student from the University of Stavanger, and Professor Jonas Snæbjörnsson from the Reykjavik University. Jarle Berge from the NPRA has also assisted in the lidar installation. The deployed lidar has been obtained through a lease agreement with, and the in-kind contribution from Leosphere, a recent NORCOWE partner.

 

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