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Suspended sediment concentration controlling factors an analysis for the Argentine Pampas region : an analysis for the Argentine Pampas region

Por: Ares, María Guadalupe. CONICET . Buenos Aires, Argentina. bInstituto de Hidrología de Llanuras “Dr E. J. Usunoff”, Azul, Argentina.
Colaborador(es): Varni, Marcelo. Instituto de Hidrología de Llanuras “Dr E. J. Usunoff”, Azul, Argentina | Chagas, Celio Ignacio. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Ingeniería Agrícola y Uso de la Tierral. Cátedra de Manejo y Conservación de Suelos. Buenos Aires, Argentina.
ISSN: 2150-3435.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): WATER EROSION | DISCHARGE | PRECIPITATION | PRINCIPAL | COMPONENT ANALYSIS | REGRESSION ANALYSIS | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Hydrological Sciences Journal Vol.61, no.12 (2016), p.2237–2248, tbls., grafs., mapasResumen: In the Argentine Pampas region, there is little information about sediment concentration in agricultural catchments. The aims of this work are: (1) to analyse fluctuations in sediment concentration and discharge, as a first attempt to characterize hysteresis patterns; and (2) to study sediment concentration controlling factors and to assess the importance of these factors using principal component analysis and a multiple regression model. Twenty-five events registered during 4 years in a 560 ha gauged basin of Argentina were studied. Analysis of data suggested a positive clockwise pattern. The multiple regression model was performed with three factors obtained by principal component analysis: runoff, precipitation and antecedent conditions. The model explained 83% of the variability of sediment concentration. The runoff factor contributed to modelled sediment concentration with the highest magnitude, followed by precipitation and antecedent condition factors. Although the watershed is under conservation tillage, rill erosion seems to be the main source of sediment concentration.
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In the Argentine Pampas region, there is little information about sediment concentration in agricultural catchments. The aims of this work are: (1) to analyse fluctuations in sediment concentration and discharge, as a first attempt to characterize hysteresis patterns; and (2) to study sediment concentration controlling factors and to assess the importance of these factors
using principal component analysis and a multiple regression model. Twenty-five events registered during 4 years in a 560 ha gauged basin of Argentina were studied. Analysis of data
suggested a positive clockwise pattern. The multiple regression model was performed with three factors obtained by principal component analysis: runoff, precipitation and antecedent conditions.
The model explained 83% of the variability of sediment concentration. The runoff factor contributed to modelled sediment concentration with the highest magnitude, followed by precipitation and antecedent condition factors. Although the watershed is under conservation tillage, rill erosion seems to be the main source of sediment concentration.

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