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Titre :
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Probability functions of best fit to distributions of annual precipitation and runoff
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Auteurs :
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R. Markovic
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Type de document :
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rapport
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Editeur :
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Fort Collins, USA : Colorado State University, 1965
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Format :
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33 p.
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Langues:
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= Anglais
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Catégories :
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CARACTERISTIQUES HYDROLOGIQUES
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Mots-clés:
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PLUVIOMETRIE ANNUELLE
;
DISTRIBUTION
;
CALCUL DE PROBABILITE
;
LOI DE DISTRIBUTION
;
RESEAU CLIMATOLOGIQUE
;
RESEAU HYDROMETRIQUE
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Résumé :
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Distributions of annual precipitation and annual river flow are studied on 2506 selected precipitation and river gaging stations in the Western United States and Southwestern Canada. Five probability functions - Normal, Log-normal with 2, Log-normal with 3, Gamma with 2 and Gamma with 3 parameters - are fitted to each individual oberved distribution. The maximum likelihood method is used for estimating the functions'parameters from oberved data. The probability of chi-square is used as a measure of goodness of fit of each function to every observed sample distribution. These five functions are then tested on all station samples grouped into four large ensembles : homogeneous precipitation, non-homogeneous precipitation, river flow corrected for the change in carryover. As results of this study, it has been found that all five probability functions investigated are applicable.
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Source :
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Hydrology Papers, vol n°8
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