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Modeling Solute Transport in Volcanic Ash Soils with Cation Exchange and Anion Retardation

Nakagawa, Kei; Momii, Kazuro and Berndtsson, Ronny LU (2011) In Environmental Modelling and Assessment 16(4). p.335-342
Abstract
Groundwater under agricultural lands is often contaminated by nitrate. In southern Japan, aquifers are covered by volcanic ash soils that can leach nitrate to the groundwater. In this study, column experiments using two volcanic ash soils (Kuroboku and Akahoya) were carried out. A mixed solution of KNO3 and K2SO4 was used in the leaching experiments. Based on the experiments, a reactive transport model was developed using the Constrained Interpolation Profile method for ion transport and used to calculate chemical equilibrium for the cation exchange reactions. Anion adsorption was modeled by retardation in the numerical model. The developed simulation model results were compared to results obtained by the reactive transport model PHAST.... (More)
Groundwater under agricultural lands is often contaminated by nitrate. In southern Japan, aquifers are covered by volcanic ash soils that can leach nitrate to the groundwater. In this study, column experiments using two volcanic ash soils (Kuroboku and Akahoya) were carried out. A mixed solution of KNO3 and K2SO4 was used in the leaching experiments. Based on the experiments, a reactive transport model was developed using the Constrained Interpolation Profile method for ion transport and used to calculate chemical equilibrium for the cation exchange reactions. Anion adsorption was modeled by retardation in the numerical model. The developed simulation model results were compared to results obtained by the reactive transport model PHAST. The developed model was shown to quite well reproduce general characteristics of the experimental results. Also, the developed model results agreed well with results from PHAST. Slight discrepancy between observed and calculated breakthrough curves was probably caused by ignoring the kinetic reaction in the model calculations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Volcanic ash soils, Nitrate, Cation exchange, Anion adsorption, Reactive transport
in
Environmental Modelling and Assessment
volume
16
issue
4
pages
335 - 342
publisher
Springer
external identifiers
  • wos:000293243800002
  • scopus:79960843608
ISSN
1573-2967
DOI
10.1007/s10666-011-9262-6
language
English
LU publication?
yes
id
63a3d257-a29e-41bf-b1fa-59c0320a1c73 (old id 2072344)
date added to LUP
2011-08-26 09:38:06
date last changed
2017-01-01 03:27:59
@article{63a3d257-a29e-41bf-b1fa-59c0320a1c73,
  abstract     = {Groundwater under agricultural lands is often contaminated by nitrate. In southern Japan, aquifers are covered by volcanic ash soils that can leach nitrate to the groundwater. In this study, column experiments using two volcanic ash soils (Kuroboku and Akahoya) were carried out. A mixed solution of KNO3 and K2SO4 was used in the leaching experiments. Based on the experiments, a reactive transport model was developed using the Constrained Interpolation Profile method for ion transport and used to calculate chemical equilibrium for the cation exchange reactions. Anion adsorption was modeled by retardation in the numerical model. The developed simulation model results were compared to results obtained by the reactive transport model PHAST. The developed model was shown to quite well reproduce general characteristics of the experimental results. Also, the developed model results agreed well with results from PHAST. Slight discrepancy between observed and calculated breakthrough curves was probably caused by ignoring the kinetic reaction in the model calculations.},
  author       = {Nakagawa, Kei and Momii, Kazuro and Berndtsson, Ronny},
  issn         = {1573-2967},
  keyword      = {Volcanic ash soils,Nitrate,Cation exchange,Anion adsorption,Reactive transport},
  language     = {eng},
  number       = {4},
  pages        = {335--342},
  publisher    = {Springer},
  series       = {Environmental Modelling and Assessment},
  title        = {Modeling Solute Transport in Volcanic Ash Soils with Cation Exchange and Anion Retardation},
  url          = {http://dx.doi.org/10.1007/s10666-011-9262-6},
  volume       = {16},
  year         = {2011},
}