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dc.contributor.authorLong, Junsheng,1956-
dc.creatorLong, Junsheng,1956-en_US
dc.date.accessioned2011-11-28T14:10:43Z
dc.date.available2011-11-28T14:10:43Z
dc.date.issued1986en_US
dc.identifier.urihttp://hdl.handle.net/10150/191919
dc.description.abstractSince the uniform rainfall over the watershed is the most fundamental assumption in small watershed modelling, the limitation on watershed size should be investigated. This study defines the unit watershed size as a dimensinal criteron which is associated with the storm size, and the extent and frequency of storm exclusion ( called spatial and temporal errors). Two approaches of determining average storm cell radius were proposed. One is related with the spatial variation in storm rainfall (DSIP), while another considers both spatial variation and storm exclusion events (RVIP). Both analytical and empirical solutions are obtained and the effect of multiplestorm events is discussed. The storm radius for Walnut Gulch is determined as 4.6 miles which is close to others' results. Given storm radius, a relationship between unit watershed size and the spatial and temporal errors is developed analytically. Based on this relationship, both selection and evaluation of unit watershed size are made possible. If the error levels are known, then the proper watershed size can be selected and if the watershed size is given, then the error levels can be evaluated. By using unit watershed size, the models of small watersheds may be extended to those of large watersheds.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectHydrology.
dc.subjectWatersheds -- Models.
dc.subjectStorms -- Models.
dc.titleDetermination of unit watershed size for use in small watershed hydrological modelingen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.contributor.chairThames, John L.en_US
dc.identifier.oclc213416744en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.contributor.committeememberFogel, Martin M.en_US
dc.contributor.committeememberSorooshian, Sorooshen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.description.notehydrology collectionen_US
refterms.dateFOA2018-08-24T13:48:07Z
html.description.abstractSince the uniform rainfall over the watershed is the most fundamental assumption in small watershed modelling, the limitation on watershed size should be investigated. This study defines the unit watershed size as a dimensinal criteron which is associated with the storm size, and the extent and frequency of storm exclusion ( called spatial and temporal errors). Two approaches of determining average storm cell radius were proposed. One is related with the spatial variation in storm rainfall (DSIP), while another considers both spatial variation and storm exclusion events (RVIP). Both analytical and empirical solutions are obtained and the effect of multiplestorm events is discussed. The storm radius for Walnut Gulch is determined as 4.6 miles which is close to others' results. Given storm radius, a relationship between unit watershed size and the spatial and temporal errors is developed analytically. Based on this relationship, both selection and evaluation of unit watershed size are made possible. If the error levels are known, then the proper watershed size can be selected and if the watershed size is given, then the error levels can be evaluated. By using unit watershed size, the models of small watersheds may be extended to those of large watersheds.


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