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Frequency analysis of seasonal Extreme precipitation in southern Quebec (Canada): An evaluation of regional climate model simulation with respect to two gridded datasets.

Benyahya, Loubna; Gachon, Philippe; St-Hilaire, André; Laprise, René (2014). Frequency analysis of seasonal Extreme precipitation in southern Quebec (Canada): An evaluation of regional climate model simulation with respect to two gridded datasets. Hydrology Research , vol. 45 , nº 1. p. 115-133. DOI: 10.2166/nh.2013.066.

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Résumé

This study proposes an assessment procedure to compare two gridded (Cubic Spline, CS, and ANUSPLIN) datasets and one regional climate model simulation series (CRCM 4.1.1) of seasonal maximum precipitation (SMP) over southern Quebec (Canada). This study consists of: (1) identifying the appropriate models that could provide the most accurate SMP estimates at a particular grid point; (2) delineating the climatic homogeneous regions; and (3) providing sub-regional intensity-duration-frequency (IDF) estimates. More specifically, five popular probability distributions (Generalized Extreme Value, Generalized Logistic, Weibull, Gamma, Log-Normal) are compared; cluster analysis was employed to delineate a set of homogeneous sub-regions and one empirical model (Montana) was used to represent IDF relationships. From the results, it was found that: (1) CS product is more compatible with mean and maximum observed SMP time series than that of ANUSPLIN and CRCM 4.1.1 datasets, especially in summer; (2) Generalized Extreme Value represents the primary distribution pattern for the study area; (3) southern Quebec can be delineated into two distinct homogeneous sub-regions, especially in winter; and (4) Montana equation provides an accurate IDF model. This study can be viewed as an initial step towards the development of IDF curves under non-stationary conditions within the context of seasonal features in the regional precipitation regime.

Type de document:
Mots-clés libres: duration and occurrence; frequency analysis; precipitation extremes; seasonal maximum series
Centre: Centre Eau Terre Environnement
Date de dépôt: 13 déc. 2016 20:55
Dernière modification: 13 déc. 2016 20:55
URI: http://espace.inrs.ca/id/eprint/3543

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