CaracterizaÃÃo hidrodispersiva de dois solos da regiÃo irrigada do Vale do SÃo Francisco / Characterization hidrodispersive of two soils of the irrigated region of the valley of the San Francisco

AUTOR(ES)

Andrà InÃcio do Carmo

DATA DE PUBLICAÇÃO

2008

RESUMO

The hydrodispersive characterization of a Latosol and a Quartzarenic Neosol, both from the irrigated region of the SÃo Francisco Valley, was carried out in laboratory by means of assays of displacement of miscible liquids in columns of deformed soil. The assays were based on the displacement of a pulse of an amount of KBr equivalent to the volume of pores in the outflows of 0.4; 0.8; 1.2; 1.6 e 2.0 cmÂ.min-1 and in concentrations of 0.1; 0,5 e 1,0M. Each essay was carried out with three repetitions, under conditions of saturation and flow in stationary condition. The program CXTFIT 2.0 was used to adjust the analytical solution of the equation of the convectiondispersion (CDE) to the points of the experimental breakthrough curve, which yielded the hydrodispersive parameters of the retardation factor (R) and the coefficient of hydrodynamic dispersion (D). The CDE Model, carried out a good adjustment to the points of the experimental breakthrough curve, with determination coefficients varying from 98% to 99% for both soils. The values of R were near 1.0 for both soils indicating that the KBr does not interact with the soil. It was observed that the dispersivity of the Neosol was greater than that of the Latosol because the distribution of the size of the pores is greater in the Neosol.

ASSUNTO(S)

engenharia nuclear curva de eluiÃÃo parÃmetros hidrodispersivos energia nuclear breakthrough curve hydrodispersive parameters modelo cde cde model

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