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Unimodal and Bimodal Descriptions of Hydraulic Properties for Aggregated Soils

Dep. of Agricultural Engineering and Agronomy, Univ. of Naples Federico II, 80055 Portici (Naples), Italy

View larger version (26K): [in a new window]   Fig. 1 Measured and predicted water retention curves for samples a14 and a82 (Profile A) and a60 and a52 (Profile B). Predicted curves are as follows: unimodal van Genuchten (h), s optimized (VGopt) or fixed at the measured value (VGfix); bimodal van Genuchten (h) as proposed by Durner (VGbim); bimodal (h) as proposed by Ross and Smettem (RSbim)

View larger version (30K): [in a new window]   Fig. 2 Predicted pore-size distributions for Samples a14 and a82 (Profile A) and a60 and a52 (Profile B). Unimodal van Genuchten (h), s optimized (VGopt) or fixed at the measured value (VGfix); bimodal van Genuchten (h) as proposed by Durner (VGbim); bimodal (h) as proposed by Ross and Smettem (RSbim)

View larger version (18K): [in a new window]   Fig. 3 Measured and predicted water retention values for (a) VGopt and VGfix and for (b) VGbim and RSbim (h) relations

View larger version (33K): [in a new window]   Fig. 4 Measured and predicted hydraulic conductivity curves for Samples a14 and a82 (Profile A) and a60 and a52 (Profile B). Predicted curves are as follows: unimodal van Genuchten, s optimized (VGopt) or fixed at the measured value (VGfix); bimodal van Genuchten (h) as proposed by Durner (VGbim); bimodal (h) as proposed by Ross and Smettem (RSbim)

View larger version (30K): [in a new window]   Fig. 5 Measured and predicted hydraulic conductivity values according to (a) VGopt and VGfix and to (b) VGbim and RSbim (h) relations