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Unit gradient in internal drainage experiments for the determination of soil hydraulic conductivity Scientia Agricola
Reichardt,K..
It is theoretically shown that unit hydraulic potential gradients cannot occur in homogeneous soils undegoing internal drainage process even though this assumption has been used successfully by several authors of soil hydraulic conductivity methods.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil hydraulic conductivity; Unit gradient; Internal drainage.
Ano: 1993 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000100020
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On simple methods for unsaturated soil hydraulic conductivity determination Scientia Agricola
Bacchi,O.O.S.; Reichardt,K..
The simple methods of LIBARDI et al. (1980) and SISSON et al. (1980) for K(theta) estimation, although developed on completely different theoretical basis, are rigorously identical for the exponential hydraulic conductivity model. The unit gradient approximation used in these methods seems valid for practical purposes but is theoretically in valid.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil hydraulic conductivity; Unit gradient.
Ano: 1993 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161993000200022
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FRACTAL SCALING OF PARTICLE AND PORE SIZE DISTRIBUTIONS AND ITS RELATION TO SOIL HYDRAULIC CONDUCTIVITY Scientia Agricola
BACCHI,O.O.S.; REICHARDT,K.; VILLA NOVA,N.A..
Fractal scaling has been applied to soils, both for void and solid phases, as an approach to characterize the porous arrangement, attempting to relate particle-size distribution to soil water retention and soil water dynamic properties. One important point of such an analysis is the assumption that the void space geometry of soils reflects its solid phase geometry, taking into account that soil pores are lined by the full range of particles, and that their fractal dimension, which expresses their tortuosity, could be evaluated by the fractal scaling of particle-size distribution. Other authors already concluded that although fractal scaling plays an important role in soil water retention and porosity, particle-size distribution alone is not sufficient to...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Fractal; Particle size distribution; Pore size distribution; Soil water retention; Soil hydraulic conductivity.
Ano: 1996 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161996000200027
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