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Titre :
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Statistical discrimination of change in daily runoff
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Auteurs :
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A. Dumas ;
H. Morel-Seytoux
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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, 1969
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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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COLORADO
;
PLUVIOMETRIE JOURNALIERE
;
CHANGEMENT CLIMATIQUE
;
MONTAGNE
;
HYDROLOGIE STOCHASTIQUE
;
DEBIT DE COURS D'EAU
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Résumé :
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The purpose of this study was the development of a technique for rapid detection of the occurence of a suspected hydrologic change in high mountain watersheds. A method has been developed that uses a sequence of independent daily flows. This procedure is superior to previous ones based on seasonal of yearly flows. The results of this investigation show the use of daily, instead of seasonal flow, data in a staudent t-test reduces the number of necessary years of data for detection by an average of five in 14 out of the 20 cases studied, or by an average of three for the 20 cases. All of the cases come from the Upper Colorado River Basin. The study is particularly relevant to the planned cloud seeding operations of the Bureau of Reclamation in high elevation areas of the Colorado Rocky Mountains. The statistical procedure of detection relies on the Target Control concept and the application of a conditional Student t-test, a test of the difference between the adjusted means obtained by the regression lines between Target and Control for the seeded and non-seeded periods.
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Source :
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Hydrology Papers, vol n°34
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