Lidar Scanning of Momentum Flux in the Marine Boundary Layer

    Research output: Contribution to conferencePosterResearch

    66 Downloads (Pure)

    Abstract

    Momentum flux measurements are important for describing the wind profile in the atmospheric boundary layer, modeling the atmospheric flow over water, the accounting of exchange processes between air and sea, etc. It is also directly related to the friction velocity, which is a velocity scale required for wind engineering. Estimations of friction velocity over the sea can be performed by combining wind speed measurements, a sea roughness length formulation and the surface-layer wind profile, i.e. a bulk-derived method. This method was tested in Peña et al. (2008) by comparison with direct turbulence measurements from a sonic anemometer, showing high agreement. In this study, a conical scanning lidar is used to derive the momentum flux, which compares well to the estimations from the bulk-derived method, but it also shows a filtering effect due to the large spatial-averaging volume of the lidar. The spectral model by Mann (1994) is then used to numerically estimate the filtering effect of the lidar and the predictions have a good agreement with the observations for near-neutral conditions over the North Sea at the Horns Rev wind farm.
    Original languageEnglish
    Publication date2009
    Publication statusPublished - 2009
    EventEuropean Offshore Wind 2009 - Stockholm, Sweden
    Duration: 14 Sep 200916 Sep 2009
    http://www.eow2009.info/

    Conference

    ConferenceEuropean Offshore Wind 2009
    CountrySweden
    CityStockholm
    Period14/09/200916/09/2009
    Internet address

    Keywords

    • Wind energy
    • Meteorology

    Cite this

    Pena Diaz, A., Mann, J., Courtney, M., Bingöl, F., & Wagner, R. (2009). Lidar Scanning of Momentum Flux in the Marine Boundary Layer. Poster session presented at European Offshore Wind 2009, Stockholm, Sweden.
    Pena Diaz, Alfredo ; Mann, Jakob ; Courtney, Michael ; Bingöl, Ferhat ; Wagner, Rozenn. / Lidar Scanning of Momentum Flux in the Marine Boundary Layer. Poster session presented at European Offshore Wind 2009, Stockholm, Sweden.
    @conference{0255ed86600443f4b0b2349e1e53c6bd,
    title = "Lidar Scanning of Momentum Flux in the Marine Boundary Layer",
    abstract = "Momentum flux measurements are important for describing the wind profile in the atmospheric boundary layer, modeling the atmospheric flow over water, the accounting of exchange processes between air and sea, etc. It is also directly related to the friction velocity, which is a velocity scale required for wind engineering. Estimations of friction velocity over the sea can be performed by combining wind speed measurements, a sea roughness length formulation and the surface-layer wind profile, i.e. a bulk-derived method. This method was tested in Pe{\~n}a et al. (2008) by comparison with direct turbulence measurements from a sonic anemometer, showing high agreement. In this study, a conical scanning lidar is used to derive the momentum flux, which compares well to the estimations from the bulk-derived method, but it also shows a filtering effect due to the large spatial-averaging volume of the lidar. The spectral model by Mann (1994) is then used to numerically estimate the filtering effect of the lidar and the predictions have a good agreement with the observations for near-neutral conditions over the North Sea at the Horns Rev wind farm.",
    keywords = "Wind energy, Meteorology, Meteorologi, Vindenergi",
    author = "{Pena Diaz}, Alfredo and Jakob Mann and Michael Courtney and Ferhat Bing{\"o}l and Rozenn Wagner",
    year = "2009",
    language = "English",
    note = "European Offshore Wind 2009, EOW 2009 ; Conference date: 14-09-2009 Through 16-09-2009",
    url = "http://www.eow2009.info/",

    }

    Pena Diaz, A, Mann, J, Courtney, M, Bingöl, F & Wagner, R 2009, 'Lidar Scanning of Momentum Flux in the Marine Boundary Layer' European Offshore Wind 2009, Stockholm, Sweden, 14/09/2009 - 16/09/2009, .

    Lidar Scanning of Momentum Flux in the Marine Boundary Layer. / Pena Diaz, Alfredo; Mann, Jakob; Courtney, Michael; Bingöl, Ferhat; Wagner, Rozenn.

    2009. Poster session presented at European Offshore Wind 2009, Stockholm, Sweden.

    Research output: Contribution to conferencePosterResearch

    TY - CONF

    T1 - Lidar Scanning of Momentum Flux in the Marine Boundary Layer

    AU - Pena Diaz, Alfredo

    AU - Mann, Jakob

    AU - Courtney, Michael

    AU - Bingöl, Ferhat

    AU - Wagner, Rozenn

    PY - 2009

    Y1 - 2009

    N2 - Momentum flux measurements are important for describing the wind profile in the atmospheric boundary layer, modeling the atmospheric flow over water, the accounting of exchange processes between air and sea, etc. It is also directly related to the friction velocity, which is a velocity scale required for wind engineering. Estimations of friction velocity over the sea can be performed by combining wind speed measurements, a sea roughness length formulation and the surface-layer wind profile, i.e. a bulk-derived method. This method was tested in Peña et al. (2008) by comparison with direct turbulence measurements from a sonic anemometer, showing high agreement. In this study, a conical scanning lidar is used to derive the momentum flux, which compares well to the estimations from the bulk-derived method, but it also shows a filtering effect due to the large spatial-averaging volume of the lidar. The spectral model by Mann (1994) is then used to numerically estimate the filtering effect of the lidar and the predictions have a good agreement with the observations for near-neutral conditions over the North Sea at the Horns Rev wind farm.

    AB - Momentum flux measurements are important for describing the wind profile in the atmospheric boundary layer, modeling the atmospheric flow over water, the accounting of exchange processes between air and sea, etc. It is also directly related to the friction velocity, which is a velocity scale required for wind engineering. Estimations of friction velocity over the sea can be performed by combining wind speed measurements, a sea roughness length formulation and the surface-layer wind profile, i.e. a bulk-derived method. This method was tested in Peña et al. (2008) by comparison with direct turbulence measurements from a sonic anemometer, showing high agreement. In this study, a conical scanning lidar is used to derive the momentum flux, which compares well to the estimations from the bulk-derived method, but it also shows a filtering effect due to the large spatial-averaging volume of the lidar. The spectral model by Mann (1994) is then used to numerically estimate the filtering effect of the lidar and the predictions have a good agreement with the observations for near-neutral conditions over the North Sea at the Horns Rev wind farm.

    KW - Wind energy

    KW - Meteorology

    KW - Meteorologi

    KW - Vindenergi

    M3 - Poster

    ER -

    Pena Diaz A, Mann J, Courtney M, Bingöl F, Wagner R. Lidar Scanning of Momentum Flux in the Marine Boundary Layer. 2009. Poster session presented at European Offshore Wind 2009, Stockholm, Sweden.