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- W4311785946 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The flow inside and around large offshore wind farms can range from smaller structures associated with the mechanical turbulence generated by wind turbines to larger structures indicative of the mesoscale flow. In this study, we explore the variation in turbulence structures and dominant scales of vertical entrainment above large offshore wind farms located in the North Sea, using data obtained from a research aircraft. The aircraft was flown upstream, downstream, and above wind farm clusters. Under neutrally stratified conditions, there is high ambient turbulence in the atmosphere and an elevated energy dissipation rate compared to stable conditions. The intensity of small-scale turbulence structures is increased above and downstream of the wind farm, and it prevails over mesoscale fluctuations. But in stable stratification, mesoscale flow structures are not only dominant upstream of the wind farm but also downstream. We observed that the vertical flux of horizontal momentum is the main source of energy recovery in large offshore wind farms, and it strongly depends on the magnitude of the length scales of the vertical wind velocity component. The dominant length scales of entrainment range from 20 to <span class=inline-formula>â¼60</span>âm above the wind farm in all stratification strengths, and in the wake flow these scales range from 10Â to <span class=inline-formula>â¼100</span>âm only under near-neutral stratification. For strongly stable conditions, negligible vertical entrainment of momentum was observed even just 2âkm downstream of large wind farms. We also observed that there is a significant lateral momentum flux above the offshore wind farms, especially under strongly stable conditions, which suggests that these wind farms do not satisfy the conditions of an âinfinite wind farmâ." @default.
- W4311785946 created "2022-12-28" @default.
- W4311785946 creator A5029644270 @default.
- W4311785946 date "2022-12-15" @default.
- W4311785946 modified "2023-09-30" @default.
- W4311785946 title "Reply on RC1" @default.
- W4311785946 doi "https://doi.org/10.5194/wes-2022-69-ac1" @default.
- W4311785946 hasPublicationYear "2022" @default.
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