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• W2023187907 abstract "Abstract The instantaneous unit hydrograph (IUH) of a watershed is the result of one instantaneous unit of rainfall excess distributed uniformly over the watershed. Although the geomorphological characteristics of the basin remain relatively constant, the variable characteristics of storms cause variations in the shape of the resulting hydrographs. It is, therefore, inadequate to use one typical IUH to represent the hydrological response generated from any specific storm. In this study, a variable IUH was derived that directly reflects the time-varying rainfall intensity during storms. The rainfall intensity used to generate the variable IUH at time t is the mean rainfall intensity occurring from the time t—T c to t in which T c is the watershed time of concentration. Hydrological records from three watersheds in Taiwan were used to demonstrate the applicability of the proposed model. The results show that better simulations can be obtained by using the proposed model than by using the conventional unit hydrograph method, especially for concentrated rainstorm cases. Résumé L'hydrogramme unitaire instantané (HUI) d'un bassin versant et la résultante d'une unité instantanée de pluie nette distribuée uniformément dans l'espace du bassin versant. Bien que les caractéristiques géomorphologiques du bassin versant restent relativement constantes, les caractéristiques variables des averses génèrent des variations dans la forme des hydrogrammes résultants. Il est par conséquent inadéquat d'utiliser un HUI typique pour représenter la réponse hydrologique générée par n'importe quelle averse particulière. Dans cette étude, un HUI variable a été dérivé, qui reflète directement l'intensité pluviométrique évolutive au cours du temps durant les averses. L'intensité pluviométrique utilisée pour générer l'HUI variable au temps t est l'intensité pluviométrique moyenne entre les temps t—T c et t, o[ugrave] T c est le temps de concentration du bassin versant. Les enregistrements hydrologiques de trois bassins versants de Taiwan ont été utilisés pour démontrer l'applicabilité du modèle proposé. Les résultats montrent que de meilleures simulations peuvent être obtenues en utilisant le modèle proposé plutôt que la méthode conventionnelle de l'hydrogramme unitaire, en particulier pour les averses concentrées. Key words: variable IUHtemporal rainfall intensityrunoff modellingrunoff travel timeMots clefs: HUI variableintensité pluviométrique temporellemodélisation de l'écoulementtemps de parcours de l'écoulement" @default.
• W2023187907 created "2016-06-24" @default.
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• W2023187907 date "2008-04-01" @default.
• W2023187907 modified "2023-09-25" @default.
• W2023187907 title "Derivation of variable IUH corresponding to time-varying rainfall intensity during storms / Dérivation d'un HUI variable correspondant à l'évolution temporelle de l'intensité pluviométrique durant les averses" @default.
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• W2023187907 doi "https://doi.org/10.1623/hysj.53.2.323" @default.
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