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Regional flood frequency analysis using residual kriging in physiographical space.

Nezhad, M. Kamali; Chokmani, Karem; Ouarda, Taha B. M. J.; Barbet, Marc; Bruneau, Pierre (2010). Regional flood frequency analysis using residual kriging in physiographical space. Hydrological Processes , vol. 24 , nº 15. p. 2045-2055. DOI: 10.1002/hyp.7631.

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Résumé

In this article, an approach using residual kriging (RK) in physiographical space is proposed for regional flood frequency analysis. The physiographical space is constructed using physiographical/climatic characteristics of gauging basins by means of canonical correlation analysis (CCA). This approach is a modified version of the original method, based on ordinary kriging (OK). It is intended to handle effectively any possible spatial trends within the hydrological variables over the physiographical space. In this approach, the trend is first quantified and removed from the hydrological variable by a quadratic spatial regression. OK is therefore applied to the regression residual values. The final estimated value of a specific quantile at an ungauged station is the sum of the spatial regression estimate and the kriged residual. To evaluate the performance of the proposed method, a cross‐validation procedure is applied. Results of the proposed method indicate that RK in CCA physiographical space leads to more efficient estimates of regional flood quantiles when compared to the original approach and to a straightforward regression‐based estimator.

Type de document: Article
Mots-clés libres: physiographical space–based kriging; flood frequency analysis; canonical correlation analysis; canonical kriging; residual kriging; regional estimation
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 16:46
Dernière modification: 08 janv. 2021 16:46
URI: http://espace.inrs.ca/id/eprint/10704

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