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

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.

scholarly journals Evaluation of Solute Transport in Undisturbed Soil Column under Steady Unsaturated Flow Conditions.

1997 ◽  
pp. 61-70
Author(s):  
Masato Horiuchi ◽  
Yoriteru Inoue ◽  
Shinsuke Morisawa ◽  
Barokah Aliyanta
Keyword(s):  
Solute Transport ◽  
Unsaturated Flow ◽  
Soil Column ◽  
Flow Conditions ◽  
Undisturbed Soil

scholarly journals Bayesian Simultaneous Estimation of Unsaturated Flow and Solute Transport Parameters from a Laboratory Infiltration Experiment

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1660 ◽  
Author(s):  
Anis Younes ◽  
Jabran Zaouali ◽  
Sabri Kanzari ◽  
Francois Lehmann ◽  
Marwan Fahs
Keyword(s):  
Mass Transport ◽  
Solute Transport ◽  
Unsaturated Flow ◽  
Soil Column ◽  
Accurate Estimation ◽  
Soil Parameters ◽  
Simultaneous Estimation ◽  
Transport Parameters ◽  
Undisturbed Soil ◽  
Infiltration Experiment

Numerical modeling has become an irreplaceable tool for the investigation of water flow and solute transport in the unsaturated zone. The use of this tool for real situations is often faced with lack of knowledge of hydraulic and soil transport parameters. In this study, advanced experimental and numerical techniques are developed for an accurate estimation of the soil parameters. A laboratory unsaturated flow and solute transport experiment is conducted on a large undisturbed soil column of around 40 cm length. Bromide, used as a nonreactive contaminant, is injected at the surface of the undisturbed soil, followed by a leaching phase. The pressure measurements at different locations along the soil column as well as the outflow bromide concentration are collected during the experiment and used for the statistical calibration of flow and solute transport. The Richards equation, combined with constitutive relations for water content and permeability, is used to describe unsaturated flow. Both linear and non-equilibrium mobile–immobile transport models are investigated for the solute transport. All hydraulic and mass transport parameters are inferred using a one-step Bayesian estimation with the Markov chain Monte Carlo sampler. The results prove that the pressure and concentration measurements are able to identify almost all hydraulic and mass transport parameters. The mobile–immobile transport model better reproduces the infiltration experiment. It produces narrower uncertainty intervals for soil parameters and predictive output concentrations.

Experimental investigation of solute transport in variably saturated porous media using x-ray computed tomography

2021 ◽  
Vol 33 (7) ◽  
pp. 076610
Author(s):  
Chunwei Zhang ◽  
Yun She ◽  
Yingxue Hu ◽  
Zijing Li ◽  
Weicen Wang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Experimental Investigation ◽  
Porous Media ◽  
Solute Transport ◽  
Saturated Porous Media ◽  
X Ray ◽  
X Ray Computed

scholarly journals Managed aquifer recharge: study of undisturbed soil column tests on the infiltration and treatment capacity using effluent of wastewater stabilization pond

RBRH ◽  
2018 ◽  
Vol 23 (0) ◽  
Author(s):  
Jaqueline Vígolo Coutinho ◽  
Cristiano das Neves Almeida ◽  
Eduardo Bernardo da Silva ◽  
Catalin Stefan ◽  
Gilson Barbosa Athayde Júnior ◽  
...  
Keyword(s):  
Soil Column ◽  
Managed Aquifer Recharge ◽  
Future Research ◽  
Sewage Effluent ◽  
Ammoniacal Nitrogen ◽  
Aquifer Recharge ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Coastal Watershed ◽  
Stabilization Pond

ABSTRACT Managed Aquifer Recharge (MAR) is a useful tool for the treatment and use of sewage effluent because it complements conventional treatment, recovers the aquifer and minimizes risk of saltwater intrusion. This study aims to investigate technical data to determine the treatment of wastewater stabilization pond effluent using undisturbed soil columns collected from a coastal watershed study area within the BRAMAR (BRAzil Managed Aquifer Recharge) project. The treatment efficiency was monitored by measuring physico-chemical parameters (BOD 5, COD, DOC, TSS, NH3 and NO3) in two columns filled with undisturbed sandy soil in which sewage effluent was infiltrated under unsaturated condition for 72 days with an average input flow of 10 mm h-1. Results indicated reduction greater than 60% of organic matter, suspended solids and ammoniacal nitrogen. However, high concentrations of nitrate in the outflow were detected originating from nitrification of ammoniacal nitrogen. Moreover, difficulties in relation to soil clogging were observed. Furthermore, this study brought relevant contributions to understanding the influence of the infiltration rate and ability to treat effluent from wastewater stabilization ponds using undisturbed soil columns. Future research should be undertaken to improve the pretreatment methods and the operation of a MAR system in the study area.

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