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    Combining regional approach and data extension procedure for assessing GEV distribution of extreme precipitation in Belgium

    Authors
    Gellens, D.
    Discipline
    Earth and related Environmental sciences
    Subject
    extreme precipitation
    GEV distribution
    regionalisation
    data extension
    L-moments
    Audience
    General Public
    Scientific
    Date
    2002
    Publisher
    IRM
    KMI
    RMI
    Metadata
    Show full item record
    Description
    The k-day extreme precipitation depths (k=1, 2, 3, 4, 5, 7, 10, 15, 20, 25 and 30) at the climatological network of Belgium (165 stations) are analysed to assess the regional GEV growth curves and to determine the at-site fractiles. The calendar year and the hydrological summer and winter are considered separately. The method proposed combines regional L-moment estimates of the GEV parameters and tends to take advantage of a few long-term well-documented series. Therefore, a data extension procedure based on the fractiles method has been used to extend the 1951-1995 observation period to the 1910-1995 reference period. This ensures the temporal homogeneity of the series by assessing the possible missing extremes and it places all the series in a reference period where the stationarity of the extreme precipitation has been verified. Using the 9 historical series and generating randomly located missing values the efficiency of three data extension methods has been evaluated. This comparison indicates that a procedure using the regional growth curve satisfies this task. It shows that the residual mean square error of the at-site means is reduced when the mean correlation between the reference station and the series presenting gaps exceeds 0.52 but that the corresponding error on high order fractiles is reduced for all the observed correlation and for large numbers (40-50) of missing values. A practical estimation of the confidence intervals is proposed.
    Citation
    Gellens, D. (2002). Combining regional approach and data extension procedure for assessing GEV distribution of extreme precipitation in Belgium. , Issue 0, IRM,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/8575
    Type
    Article
    Peer-Review
    Not pertinent
    Language
    eng
    Links
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