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University of Arizona (1985)

Regionalization of southeast Arizona precipitation distributions in a daily event-based watershed hydrologic mode

Henkel, Arthur Frederick

Titre : Regionalization of southeast Arizona precipitation distributions in a daily event-based watershed hydrologic mode

Auteur : Henkel, Arthur Frederick.

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1985

Résumé
A two-component daily event-based precipitation model previously analyzed only at isolated watersheds is "regionalized" by logically grouping points over Southeast Arizona into a small number of geographic clusters. Based on their grade of membership in successive similarity functions, fuzzy set theory is used to cluster 26 rainfall stations with 19 years of historical data into four groups representing relatively homogeneous probability distributions of rainfall interarrival time and amount per event. Geographic cluster subregions are identified and boundaries are drawn with such ancillary indicators as physiography, vegetation, and seasonal rainfall. Precipitation seasons are determined, theoretical probability distributions are hypothesized, and parameters are estimated by moments for each process in the model. An inverse distance algorithm is used to vary parameters within a cluster based on elevation, latitude, and longitude. An isolated validation of the regional technique is performed at an additional station with records.

Mots clés : Hydrology. ; Experimental watershed areas — Arizona. ; Rain and rainfall — Arizona.

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Page publiée le 13 février 2016, mise à jour le 18 février 2018