Use of existing pore models and X-ray computed tomography to predict saturated soil hydraulic conductivity

Geoderma ◽  
2010 ◽  
Vol 156 (3-4) ◽  
pp. 133-142 ◽  
Author(s):  
T.R. Elliot ◽  
W.D. Reynolds ◽  
R.J. Heck
Keyword(s):  
Computed Tomography ◽  
Hydraulic Conductivity ◽  
Saturated Soil ◽  
Soil Hydraulic Conductivity ◽  
X Ray ◽  
X Ray Computed ◽  
Soil Hydraulic

Nature of the clay - cation bond affects soil structure as verified by X-ray computed tomography

Soil Research ◽  
2012 ◽  
Vol 50 (8) ◽  
pp. 638 ◽  
Author(s):  
Alla Marchuk ◽  
Pichu Rengasamy ◽  
Ann McNeill ◽  
Anupama Kumar
Keyword(s):  
Computed Tomography ◽  
Hydraulic Conductivity ◽  
Zeta Potential ◽  
Structural Stability ◽  
Structural Parameters ◽  
Pore Connectivity ◽  
X Ray ◽  
Clay Dispersion ◽  
X Ray Computed ◽  
Cation Ratio

Non-destructive X-ray computed tomography (µCT) scanning was used to characterise changes in pore architecture as influenced by the proportion of cations (Na, K, Mg, or Ca) bonded to soil particles. These observed changes were correlated with measured saturated hydraulic conductivity, clay dispersion, and zeta potential, as well as cation ratio of structural stability (CROSS) and exchangeable cation ratio. Pore architectural parameters such as total porosity, closed porosity, and pore connectivity, as characterised from µCT scans, were influenced by the valence of the cation and the extent it dominated in the soil. Soils with a dominance of Ca or Mg exhibited a well-developed pore structure and pore interconnectedness, whereas in soil dominated by Na or K there were a large number of isolated pore clusters surrounded by solid matrix where the pores were filled with dispersed clay particles. Saturated hydraulic conductivities of cationic soils dominated by a single cation were dependent on the observed pore structural parameters, and were significantly correlated with active porosity (R2 = 0.76) and pore connectivity (R2 = 0.97). Hydraulic conductivity of cation-treated soils decreased in the order Ca > Mg > K > Na, while clay dispersion, as measured by turbidity and the negative charge of the dispersed clays from these soils, measured as zeta potential, decreased in the order Na > K > Mg > Ca. The results of the study confirm that structural changes during soil–water interaction depend on the ionicity of clay–cation bonding. All of the structural parameters studied were highly correlated with the ionicity indices of dominant cations. The degree of ionicity of an individual cation also explains the different effects caused by cations within a monovalent or divalent category. While sodium adsorption ratio as a measure of soil structural stability is only applicable to sodium-dominant soils, CROSS derived from the ionicity of clay–cation bonds is better suited to soils containing multiple cations in various proportions.

scholarly journals Estimating the macroscopic capillary length from Beerkan infiltration experiments and its impact on saturated soil hydraulic conductivity predictions

2020 ◽  
Vol 589 ◽  
pp. 125159 ◽  
Author(s):  
Simone Di Prima ◽  
Ryan D. Stewart ◽  
Mirko Castellini ◽  
Vincenzo Bagarello ◽  
Majdi R. Abou Najm ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Saturated Soil ◽  
Capillary Length ◽  
Soil Hydraulic Conductivity ◽  
Soil Hydraulic

Identifying Covariates to Assess the Spatial Variability of Saturated Soil Hydraulic Conductivity Using Robust Cokriging at the Watershed Scale

2020 ◽  
Vol 20 (3) ◽  
pp. 1491-1502 ◽  
Author(s):  
Mauricio Fornalski Soares ◽  
Luana Nunes Centeno ◽  
Luís Carlos Timm ◽  
Carlos Rogério Mello ◽  
Douglas Rodrigo Kaiser ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Saturated Soil ◽  
Watershed Scale ◽  
Soil Hydraulic Conductivity ◽  
Soil Hydraulic

Identifying regionalized co-variate driving factors to assess spatial distributions of saturated soil hydraulic conductivity using multivariate and state-space analyses

CATENA ◽  
2020 ◽  
Vol 191 ◽  
pp. 104583
Author(s):  
Luana Nunes Centeno ◽  
Luís Carlos Timm ◽  
Klaus Reichardt ◽  
Samuel Beskow ◽  
Tamara Leitzke Caldeira ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
State Space ◽  
Driving Factors ◽  
Saturated Soil ◽  
Spatial Distributions ◽  
Soil Hydraulic Conductivity ◽  
Soil Hydraulic

scholarly journals Three-dimensional quantification of soil hydraulic properties using X-ray Computed Tomography and image-based modeling

2015 ◽  
Vol 51 (2) ◽  
pp. 1006-1022 ◽  
Author(s):  
Saoirse R. Tracy ◽  
Keith R. Daly ◽  
Craig J. Sturrock ◽  
Neil M. J. Crout ◽  
Sacha J. Mooney ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hydraulic Properties ◽  
Three Dimensional ◽  
Soil Hydraulic Properties ◽  
X Ray ◽  
Image Based Modeling ◽  
X Ray Computed ◽  
Soil Hydraulic
Sign in / Sign up

Export Citation Format

Share Document