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dc.contributor.advisorHawkins, Richard H.en_US
dc.contributor.authorJiang, Ruiyun.*
dc.creatorJiang, Ruiyun.en_US
dc.date.accessioned2011-11-28T13:49:57Z
dc.date.available2011-11-28T13:49:57Z
dc.date.issued2001en_US
dc.identifier.urihttp://hdl.handle.net/10150/191301
dc.description.abstractThe Curve Number method is a widely used tool for modeling runoff in ungaged watersheds. The initial abstraction ratio (Ia/S = X) is one of the most questionable points in the NRCS Curve Number model. In this study, 307 watersheds or plots were used to investigate the distribution of X. values, the relationship between Ia and S, and the influence of watershed attributes on k, Ta and CN. There are no or a weak relationship between Ia and S within a watershed, and a negative relationship across watersheds. X values vary from 0 to 0.996 for all the analyzed data. A k value of 0.05 fits better than 0.2. The forest landuse has the highest S, lowest Ia and X. X and CN decrease along with the increase of drainage area. CN is negatively related with the percentage of sand, and positively related with the percentage of clay in the soil.
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.subject.lcshHydrology.en_US
dc.subject.lcshWatershed management -- Arizona.en_US
dc.subject.lcshRunoff.en_US
dc.titleInvestigation of Runoff Curve Number Initial Abstraction Ratio.en_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.contributor.chairHawkins, Richard H.en_US
dc.identifier.oclc214288522en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.contributor.committeememberGuertin, D. Phillipen_US
dc.contributor.committeememberStone, Jeffry J.en_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.description.notehydrology collectionen_US
refterms.dateFOA2018-08-24T09:28:31Z
html.description.abstractThe Curve Number method is a widely used tool for modeling runoff in ungaged watersheds. The initial abstraction ratio (Ia/S = X) is one of the most questionable points in the NRCS Curve Number model. In this study, 307 watersheds or plots were used to investigate the distribution of X. values, the relationship between Ia and S, and the influence of watershed attributes on k, Ta and CN. There are no or a weak relationship between Ia and S within a watershed, and a negative relationship across watersheds. X values vary from 0 to 0.996 for all the analyzed data. A k value of 0.05 fits better than 0.2. The forest landuse has the highest S, lowest Ia and X. X and CN decrease along with the increase of drainage area. CN is negatively related with the percentage of sand, and positively related with the percentage of clay in the soil.


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