2000
DOI: 10.2136/sssaj2000.6441252x
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Unimodal and Bimodal Descriptions of Hydraulic Properties for Aggregated Soils

Abstract: This study was conducted to investigate the capability of bimodal approaches in describing water retention data and predicting hydraulic conductivity of 18 samples from an aggregated soil. In this soil, discontinuity in the shape of the water retention curve was encountered and explained by independent draining of the inter‐ and of intraaggregate pores. A single van Genuchten‐type retention curve was unable to describe the observed transition between the pore systems, especially near saturation. Such behavior … Show more

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Cited by 84 publications
(71 citation statements)
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“…Hydraulic measurements on soil cores with PF paths were fitted with bimodal (Coppola, 2000), dual-permeability (Köhne et al, 2002b), and multi-modal (Priesack and Durner, 2006) hydraulic functions. Physically-based dual-domain hydraulic functions were developed by upscaling modelled liquid configurations in partially saturated fractured porous media, and were fitted to hydraulic data (Tuller and Or, 2002;Or and Tuller, 2003).…”
Section: Soil Hydraulic Measurements To Derive Pf-related Soil Hydraumentioning
confidence: 99%
See 1 more Smart Citation
“…Hydraulic measurements on soil cores with PF paths were fitted with bimodal (Coppola, 2000), dual-permeability (Köhne et al, 2002b), and multi-modal (Priesack and Durner, 2006) hydraulic functions. Physically-based dual-domain hydraulic functions were developed by upscaling modelled liquid configurations in partially saturated fractured porous media, and were fitted to hydraulic data (Tuller and Or, 2002;Or and Tuller, 2003).…”
Section: Soil Hydraulic Measurements To Derive Pf-related Soil Hydraumentioning
confidence: 99%
“…Parameter fitting of retention and hydraulic conductivity measurements on soil cores (Othmer et al, 1991;Ross and Smettem, 1993;Durner, 1994;Coppola, 2000;Köhne et al, 2002b, Priesack andDurner, 2006) UC θ(h) and K(h) of fractured porous media Upscaling of modelled liquid configurations of cross-sections of partially saturated fractured porous soil or rock (Tuller and Or, 2002;Or and Tuller, 2003) UC Moreover, it was suggested to direct more effort to derive pedotransfer functions accounting for soil structure effects (Merdun and Quisenberry, 2004;Pachepsky et al, 2006). The relation between lateral dispersivity, unsaturated hydraulic conductivity, and soil morphological properties, was studied in tracer experiments carried out in columns and field plots with key Belgian soil types (Vanderborght et al, 2001).…”
Section: Column Experiments and Pedotransfer Functionsmentioning
confidence: 99%
“…The water retention curve of the composite porosity soil was obtained as a weighted sum of the partial water retention curves. This approach has been frequently used for describing hydraulic properties and water flow in structured soils [Coppola, 2000;Coppola et al, 2009b].…”
Section: Introductionmentioning
confidence: 99%
“…Following disk permeameter measurements, the soil was allowed to drain for about three hours and then an undisturbed soil sample 15 cm in diameter and 20 cm high was dug out of the 4th subplot immediately below the porous disk, to measure the hydraulic conductivity in the laboratory with the crust method ( Figure 23) (Booltink et al, 1991;Coppola et al, 2000). Once it has been ascertained that the water flux density in is equal to the water flux density out, the hydraulic conductivity will be equal to the imposed water flux.…”
Section: A Case Studymentioning
confidence: 99%
“…The state-space method (Kalman, 1960) is particularly interesting when the phenomenon in question satisfies certain systems of differential equations. The method has been used in economics (Shumway and Stoffer;2000) and has yielded good results in agronomic and soil science (Vieira et al, 1983;Morkoc et al, 1985;Wendroth et al, 1992;Comegna and Vitale, 1993;Wu et al, 1997;Cassel et al, 2000;Poulsen et al, 2003;Nielsen and Wendroth, 2003) Having set the initial values, we may obtain optimal forecasts and estimates of the nonobservable components by using the Kalman filter. At the same time, from many observations made of soil physical and hydraulic properties, the latter may plausibly have been generated by stationary isotropic processes with parameters independent of the individual measuring points:…”
Section: State-space Model Formulationmentioning
confidence: 99%