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    "Application of a new wind gust parameterisation: three case studies performed with the Canadian RCM"

    Authors
    Goyette, S.
    Brasseur, O.
    Beniston, M.
    Discipline
    Earth and related Environmental sciences
    Subject
    Canadian RCM
    HARMONIE
    weather prediction
    lagrange
    Audience
    General Public
    Scientific
    Date
    2003
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    The implementation of a physically based parameterization scheme for computation of wind gusts in a numerical regional climate model (RCM) is described in this paper. The method is based on an innovative approach proposed by Brasseur [2001] that assumes that gusts occurring at the surface result from the deflection of air parcels flowing higher in the boundary layer. Our parameterization scheme is developed so as to use quantities available at each model time step: consequently, the gusts are also computed for each of these time steps. To illustrate the performances of this novel method, gusts simulated for two severe midlatitude windstorms with the Canadian RCM at various resolutions are compared with observed gust speeds. The study is carried out concurrently for the complex terrain of Switzerland and for the smoother topography of Belgium. A preliminary analysis indicates that this parameterization performs equally well over flat and over mountainous regions; it also responds properly in the strengthening as well as the weakening phases of wind storms. The storm-dependent results rely on the model configuration associated with the downscaling procedure, as well as on the accuracy of the simulated flow fields. The model response is dependent on the resolved topography distribution and height and on the types of lower boundary conditions that affect the stability of the boundary layer. The simulated gusts are generally more realistic at higher resolution over the complex topography of Switzerland but are less sensitive to resolution over the flat terrain as in Belgium. On the basis of these two storms, this study also shows that simple scaling coefficients relating gust speeds and resolution are not an appropriate method for addressing such issues.
    Citation
    Goyette, S.; Brasseur, O.; Beniston, M. (2003). "Application of a new wind gust parameterisation: three case studies performed with the Canadian RCM". , Issue Journal of Geophysical Research, 108 (D13), pp. 4374-4390, IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8819
    Type
    Article
    Peer-Review
    Not pertinent
    Language
    eng
    Links
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