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Influence of vertical turbulent momentum flux on the static stability of the marine boundary layer

Tuffo is part of the research initiative RAVE (Research at alpha ventus). The German Wind Energy Institute (DEWI) in Wilhelmshaven is project partner.

It is the aim of the project to investigate the impact of atmospheric humidity and turbulent humidity fluxes on the static stability of the marine boundary layer in which future offshore wind parks will operate. Static stability influences vertical profiles of turbulence intensity and wind. Both these variables influence gain and fatigue of the wind turbines in these wind parks. Additionally, turbulence intensity determines the strength and length of wakes behind single turbines and entire wind parks.

Therefore, high-resolution humidity sensors are mounted at FINO1 parallel to the existing sonic anemometers. Lidar scanners for the detection of turbulence are mounted on some of the turbine nacelles as well.

Spectra and vertical turbulent humidity fluxes as well as their impact on turbulence and the static stability are determined from the high-resolution wind and humidity measurements. The results can be used to check the turbulence parameterization schemes in numerical wind field models and to suggest and implement improvements for these parameterizations. The impact on wakes are analyzed as well.

The results from these high-resolution measurements provide a more reliable basis for the assessment of loads and fatigue of offshore wind turbines. The enhancement of numerical wind field and wake models allows for a better planning and operation of such wind parks. This contributes to a optimal integration of offshore wind parks into European electricity grids.

This project is part of the wind energy meteorology  efforts of the institute which is closely related to the efforts made to analyse and describe the vertical structure of the atmospheric boundary layer over different surfaces (cities, rural areas, complex terrain, water) as a prerequisite for trace gas and aerosol emission, transformation and dispersion studies.

Link to presentation at TUFFO-RAVE conference, Bremerhaven, 13.10.2015

This project has started on August 1, 2011 and ended on January 31, 2015. The work in this project was done by Richard Foreman.

 

Contact: Stefan Emeis

 

Acknowledgements

 

 This work has been funded by the German Federal Ministry for the Environment, Nature Conservation and Nuclear Safety via the PTJ under grant number FKZ 0325304