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Delineation of homogeneous regions for regional frequency analysis using statistical depth function.

Wazneh, Hussein; Chebana, Fateh; Ouarda, Taha B. M. J. (2015). Delineation of homogeneous regions for regional frequency analysis using statistical depth function. Journal of Hydrology , vol. 521 . p. 232-244. DOI: 10.1016/j.jhydrol.2014.11.068.

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Résumé

The aim of regional frequency analysis (RFA) is to estimate extreme hydrological events at sites where little or no hydrological data are available. The delineation of sub-regions and the regional estimation within these sub-regions are the two main steps of RFA. As currently practiced, the delineation step is unrobust and subjective. To overcome these limitations, the present paper aims to propose a new robust approach for delineating homogeneous sub-regions. The proposed approach is objective and based on the concept of depth function. A data set from three geographical regions in the North-West of Italy is used to apply and compare the proposed approach with a traditional one. Results indicate that the proposed depth-based approach leads to more homogeneous sub-regions in terms of H heterogeneity measure, and leading to more efficient quantile estimations in terms of relative bias and relative root mean square error, than those obtained by the traditional approach.

Type de document: Article
Mots-clés libres: ungauged basins; homogeneous sub-region; regional frequency analysis; statistical depth function; clustering analysis
Centre: Centre Eau Terre Environnement
Date de dépôt: 25 avr. 2018 15:12
Dernière modification: 25 avr. 2018 15:12
URI: http://espace.inrs.ca/id/eprint/3954

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