HAL : insu-00509254, version 1

DOI : 10.1016/j.scitotenv.2010.05.001

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Science of The Total Environment 408, 19 (2010) 4221-4229

Estimation of local extreme suspended sediment concentrations in California Rivers

Yves Tramblay 1, 2, André Saint-Hilaire 1, 3, Taha B.M.J. Ouarda 1, Florentina Moatar 4, Barry Hecht 5

(2010)

The total amount of suspended sediment load carried by a stream during a year is usually transported during one or several extreme events related to high river flow and intense rainfall, leading to very high suspended sediment concentrations (SSCs). In this study quantiles of SSC derived from annual maximums and the 99th percentile of SSC series are considered to be estimated locally in a site-specific approach using regional information. Analyses of relationships between physiographic characteristics and the selected indicators were undertaken using the localities of 5-km radius draining of each sampling site. Multiple regression models were built to test the regional estimation for these indicators of suspended sediment transport. To assess the accuracy of the estimates, a Jack-Knife re-sampling procedure was used to compute the relative bias and root mean square error of the models. Results show that for the 19 stations considered in California, the extreme SSCs can be estimated with 40–60% uncertainty, depending on the presence of flow regulation in the basin. This modelling approach is likely to prove functional in other Mediterranean climate watersheds since they appear useful in California, where geologic, climatic, physiographic, and land-use conditions are highly variable.

1 :	Chair in Statistical Hydrology
	INRS-ETE
2 :	Hydrosciences Montpellier (HSM)
	CNRS : UMR5569 – Institut de recherche pour le développement [IRD] – Université Montpellier II - Sciences et techniques
3 :	Canadian Rivers Institute
	University of New Brunswick
4 :	Institut des Sciences de la Terre d'Orléans (ISTO)
	Université d'Orléans – CNRS : UMR6113 – Université François Rabelais - Tours – INSU
5 :	Balance Hydrologics
	Balance Hydrologics

domaine

:

Planète et Univers/Interfaces continentales, environnement Sciences de l'environnement/Milieux et Changements globaux

mots-clés : Extreme suspended sediment concentration – Regional estimation – California – Frequency analysis

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Soumis le : Mercredi 9 Février 2011, 14:26:23

Dernière modification le : Mercredi 9 Février 2011, 17:41:47