scholarly journals Quantitative imaging of solute transport in an unsaturated and undisturbed soil monolith with 3-D ERT and TDR

2008 ◽  
Vol 44 (12) ◽  
Author(s):  
Johannes Koestel ◽  
Andreas Kemna ◽  
Mathieu Javaux ◽  
Andrew Binley ◽  
Harry Vereecken
Keyword(s):  
Solute Transport ◽  
Quantitative Imaging ◽  
Undisturbed Soil ◽  
Soil Monolith

A Two-Domain Approach to Model Solute Transport in an Undisturbed Soil Column using X-Ray CAT Scanning

2013 ◽  
Author(s):  
J. Perret ◽  
S.O. Prasher ◽  
A. Kanztas ◽  
and C. Langford
Keyword(s):  
Solute Transport ◽  
Soil Column ◽  
Undisturbed Soil ◽  
X Ray

Leaching of copper, chromium, and arsenic through some free-draining New Zealand soils

Soil Research ◽  
1996 ◽  
Vol 34 (4) ◽  
pp. 583 ◽  
Author(s):  
PL Carey ◽  
RG Mclaren ◽  
KC Cameron ◽  
JR Sedcole
Keyword(s):  
New Zealand ◽  
Chemical Properties ◽  
Physical Structure ◽  
Breakthrough Curves ◽  
Undisturbed Soil ◽  
Soil Monolith ◽  
Copper Chromium ◽  
Growth Differences ◽  
Physical And Chemical ◽  
Parameter Values

Concentrated toxic solutions of copper, chromium, and arsenic (CCA) are used extensively in the New Zealand timber preservation industry. A 2% w/v solution containing cupric, dichromate, and arsenate ions was leached through undisturbed soil monolith lysimeters containing the surface and subsurface horizons of 2 free-draining New Zealand soils. The resulting breakthrough curves were successfully modelled using the Gompertz equation for biomass growth. Differences between soil horizons in the fitted Gompertz parameter values were related to differences in soil physical and chemical properties affecting leaching. Results were compared to those from a previous study investigating pulse leaching of a concentrated CCA solution of similar ion ratio using the same soils. Generally, solution leaching produced breakthrough curves influenced more by the soil's physical structure and less by kinetic processes (i.e. sorption and diffusion). This was in part due to the high metal concentrations of the CCA solution and the decreased contact time between soil and solute in the solution leaching experiment. The relative ease of solute ion breakthrough increased in the order copper < arsenate < dichromate. The study suggests that further research is required to assess management implications for spills of these heavy metal ions to soils to prevent leaching or runoff to ground and surface water.

scholarly journals A Nonlinear Solute Transport Model and Data Reconstruction with Parameter Determination in an Undisturbed Soil-Column Experiment

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Gongsheng Li ◽  
De Yao ◽  
Yongzai Wang ◽  
Xianzheng Jia
Keyword(s):  
Inverse Problem ◽  
Solute Transport ◽  
Transport Model ◽  
Soil Column ◽  
Parameter Determination ◽  
Nonlinear Transport ◽  
Inversion Algorithm ◽  
Unknown Parameters ◽  
Undisturbed Soil ◽  
Optimal Perturbation

A real undisturbed soil-column infiltrating experiment in Zibo, Shandong, China, is investigated, and a nonlinear transport model for a solute ion penetrating through the column is put forward by using nonlinear Freundlich's adsorption isotherm. Since Freundlich's exponent and adsorption coefficient and source/sink terms in the model cannot be measured directly, an inverse problem of determining these parameters is encountered based on additional breakthrough data. Furthermore, an optimal perturbation regularization algorithm is introduced to determine the unknown parameters simultaneously. Numerical simulations are carried out and then the inversion algorithm is applied to solve the real inverse problem and reconstruct the measured data successfully. The computational results show that the nonlinear advection-dispersion equation discussed in this paper can be utilized by hydrogeologists to research solute transport behaviors with nonlinear adsorption in porous medium.

A method to prevent edge-flow in undisturbed soil cores and lysimeters

Soil Research ◽  
1990 ◽  
Vol 28 (6) ◽  
pp. 879 ◽  
Author(s):  
KC Cameron ◽  
DF Harrison ◽  
NP Smith ◽  
CDA Mclay
Keyword(s):  
Hydraulic Conductivity ◽  
Soil Samples ◽  
Soil Cores ◽  
Undisturbed Soil ◽  
Annular Gap ◽  
Solute Movement ◽  
Soil Monolith ◽  
Undisturbed Soil Cores ◽  
Edge Flow ◽  
Solute Leaching

This study shows that edge-flow of water and solutes between soil samples and lysimeter or permeameter casings can result in significant errors in the measurement of hydraulic conductivity and leaching rates. A new lysimeter design and technique are described which prevent edge-flow from occurring. Liquefied petrolatum is injected into an annular gap between the soil and the lysimeter casing producing a watertight seal. Water and solute movement in the sealed lysimeter is therefore confined within the soil monolith and no edge-flow occurs. Hydraulic conductivity and solute leaching rates are significantly lower in sealed lysimeters compared with unsealed ones.

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