Chapter

Sea – Wind – Power

pp 145-151

Date:

Sometimes It Almost Bubbles Like a Witches’ Cauldron

How the Moisture Fluxes Above the Sea Influence the Turbulences in Offshore Wind Farms
  • Stefan EmeisAffiliated withKarlsruhe Institute of Technology, Institute of Meteorology and Climate Research Email author 
  • , Thomas NeumannAffiliated withformerly UL International GmbH
  • , Richard ForemanAffiliated withformerly UL International GmbH
  • , Beatriz CañadillasAffiliated withformerly UL International GmbH

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Abstract

When moist and lighter air rises above the comparatively warm sea and meets the drier, heavier layers of air above, it results in vertical rearrangement of these air layers, in turbulences. The investigation of the influences of the atmospheric moisture and the turbulent moisture fluxes on the static stability of the lower layers of air over the sea were the focuses of the RAVE project Measuring and Evaluating the Influence of Turbulent Humidity Fluxes on the Turbulence in Offshore Wind Farms. The turbulence increase especially in the wake flux behind the wind turbines and affect both the yield as well as the fatigue of the offshore wind turbines. The evaluation of meteorological data provides statistical information about the atmospheric turbulence and its relevance under different weather conditions. The vertical profiles of the turbulence can be measured and analysed with the aid of wind lidars.