Data/hora: 04/06/2024 18:04:35

Biblioteca(s): | Embrapa Solos.
Data corrente: | 22/11/2002
Data da última atualização: | 22/11/2002
Autoria: | CASSOL, E. A.
Título: | Sediment transport and deposition of various textured soils in shallow flow.
Ano de publicação: | 1988
Fonte/Imprenta: | [S.l.]: Purdue University, 1988.
Páginas: | 300 p.
Idioma: | Inglês
Notas: | Tese Doutorado.
Conteúdo: | Soils with a wide range of textural composition were used in a series of laboratory experiments conducted to study the transport and deposition of sediment eroded by simulated rainfall, and deposited along a concave 0.5x3.0 m bed. A procedure was developed to determine the density of soil aggregates for the silt loam and silty clay soils. Samples of sediment entering, leaving and deposited on the concave bed were collected. Change in characteristics of sediment leaving the depositional area with time compared with the inflow sediment were studied. Deposition of sediment on the concave bed, its evolution of a deposition profile, size distribution of deposited sediment along the bed, and distribution between primary particles and aggregates were examined. Findings for these shallow flow conditions were at variance with the classic sediment transport theory. In this study, for silty clay and fine sand soils, median size of deposited sediment increased in the downslope direction, while for the silt loam the median size decreased downslope. For silt loam and silty clay soils, median size of sediment leaving the depositional area increased with time, while for the sand soil the median size decreased with time. The degree of exposure of particles to flow and raindrop impacting the area were found to be the major cause for these results. Dimensionless sediment transport relationships were developed for uniform and non-uniform size of non-cohesive sand sediment and for non-uniform cohesive agricultural soils. For the ...
Palavras-Chave: | Deposicao.
Thesagro: | Erosão; Sedimentação; Solo.
Categoria do assunto: | --
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (595-1) - ADD - TS - -- - 88006 - CAS/88 - 1992.00074 - DIS