Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/39654
Registro completo de metadados
Campo DCValorIdioma
dc.creatorAlves, G. J.-
dc.creatorMello, C. Rogério de-
dc.creatorBeskow, S.-
dc.creatorJunqueira, J. A.-
dc.creatorNearing, M. A.-
dc.date.accessioned2020-04-01T20:49:01Z-
dc.date.available2020-04-01T20:49:01Z-
dc.date.issued2019-09-
dc.identifier.citationALVES, G. J. et al. Assessment of the soil conservation service-curve number method performance in a tropical oxisol watershed. Journal of Soil and Water Conservation, [S.l.], v. 74, n. 5, p. 500-512, Sept. 2019.pt_BR
dc.identifier.urihttps://www.jswconline.org/content/74/5/500pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/39654-
dc.description.abstractThe Soil Conservation Service–Curve Number (SCS-CN) method is a rainfall-runoff model intended to estimate direct surface runoff (DSR) from rainfall. This method is based on an empirical approach of the relationship between rainfall (P) and ground conditions (soils, management, and antecedent moisture content). SCS-CN method can be applied using published tables containing a CN value for each combination of soil hydrology, land use, and management, and the total five-day antecedent rainfall (P5). However, its accuracy increases as observed rainfall-runoff events are used for calibration. The standard SCS-CN method assigns 0.2 to the initial abstraction coefficient (λ), which refers to the ratio between initial rainfall abstraction (Ia) and the potential maximum retention (S). In this study, λ was evaluated for a tropical watershed with predominance of Oxisols using 15 methodologies for CN characterization, based on CN values published by National Engineering Handbook, Section 4 (NEH-4) and also derived from 166 monitored rainfall-runoff events. Such methodologies include the use of λ equal to 0.2—standard approach, 0.02—average value obtained from the 166 events, and 0.05—a value that has been suggested in some studies. The results demonstrated that a fixed area-weighted CN representing the entire watershed gave poor accuracy even when antecedent runoff condition (ARC) was considered. In contrast, the methodology based on calibration to the observed hydrological events provided good results. Improvements in DSR estimates were found for most of the methodologies applied when λ was set equal to 0.05 and 0.02 instead of 0.2, except for the spatially distributed CN model (Heterogeneity Model), in which the use of λ = 0.2 implied improvement of DSR estimates.pt_BR
dc.languageen_USpt_BR
dc.publisherSoil Conservation Society of Americapt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceJournal of Soil and Water Conservationpt_BR
dc.titleAssessment of the soil conservation service-curve number method performance in a tropical oxisol watershedpt_BR
dc.typeArtigopt_BR
Aparece nas coleções:DEG - Artigos publicados em periódicos
DRH - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.