Reactive solute transport with a variable selectivity coefficient in an undisturbed soil column
Momii, Kazuro ; Hiroshiro, Yoshinari ; Jinno, Kenji and Berndtsson, Ronny LU
(1997)
In Soil Science Society of America Journal
61(6).
p.1539-1546
- Abstract
The spatial distribution of major ion concentration limits the predictability of solute sport processes in field soils. Therefore, it is important to analyze solute transport with chemical reactions based on results obtained from field soils and numerical simulation. A simulation model with cation-exchange reactions was developed and applied to solute-transport analysis of an undisturbed field soil. Chemical reaction terms in the convective-dispersive equation were estimated by the Levenberg-Marquardt nonlinear least-squares regression technique to satisfy physical stud chemical processes simultaneously. The reliability of the model was tested with liquid-phase and solid-phase concentrations of measured spatial distributions of... (More)
The spatial distribution of major ion concentration limits the predictability of solute sport processes in field soils. Therefore, it is important to analyze solute transport with chemical reactions based on results obtained from field soils and numerical simulation. A simulation model with cation-exchange reactions was developed and applied to solute-transport analysis of an undisturbed field soil. Chemical reaction terms in the convective-dispersive equation were estimated by the Levenberg-Marquardt nonlinear least-squares regression technique to satisfy physical stud chemical processes simultaneously. The reliability of the model was tested with liquid-phase and solid-phase concentrations of measured spatial distributions of Ca2+, Mg2+, Na+, and K+ after continuous infiltration of KCl solution into an undisturbed soft column. The experimental results revealed that the selectivity coefficients for Ca-Na and Co-Mg exchange could be kept constant, while those for Ca-K exchange increased with the equivalent fraction of K+ in the solid phase. The effects of the exchange selectivity coefficient on reactive solute transport are discussed based on the simulation results. When a constant selectivity coefficient was used, the model failed to predict the spatial distributions of cation concentrations in the solid phase. Thus, model predictions can be improved by use of variable instead of constant selectivity coefficients.
(Less)
- author
- Momii, Kazuro
; Hiroshiro, Yoshinari
; Jinno, Kenji
and Berndtsson, Ronny
LU
- organization
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Soil Science Society of America Journal
- volume
- 61
- issue
- 6
- pages
- 8 pages
- publisher
- Soil Science Society of Americ
- external identifiers
-
- scopus:0031402360
- ISSN
- 0361-5995
- DOI
- 10.2136/sssaj1997.03615995006100060001x
- language
- English
- LU publication?
- yes
- id
- 79442ee2-6d11-45d8-9ddb-2346fd8abc72
- date added to LUP
- 2023-08-17 15:24:19
- date last changed
- 2023-08-21 17:00:23
@article{79442ee2-6d11-45d8-9ddb-2346fd8abc72,
abstract = {{<p>The spatial distribution of major ion concentration limits the predictability of solute sport processes in field soils. Therefore, it is important to analyze solute transport with chemical reactions based on results obtained from field soils and numerical simulation. A simulation model with cation-exchange reactions was developed and applied to solute-transport analysis of an undisturbed field soil. Chemical reaction terms in the convective-dispersive equation were estimated by the Levenberg-Marquardt nonlinear least-squares regression technique to satisfy physical stud chemical processes simultaneously. The reliability of the model was tested with liquid-phase and solid-phase concentrations of measured spatial distributions of Ca<sup>2+</sup>, Mg<sup>2+</sup>, Na<sup>+</sup>, and K<sup>+</sup> after continuous infiltration of KCl solution into an undisturbed soft column. The experimental results revealed that the selectivity coefficients for Ca-Na and Co-Mg exchange could be kept constant, while those for Ca-K exchange increased with the equivalent fraction of K<sup>+</sup> in the solid phase. The effects of the exchange selectivity coefficient on reactive solute transport are discussed based on the simulation results. When a constant selectivity coefficient was used, the model failed to predict the spatial distributions of cation concentrations in the solid phase. Thus, model predictions can be improved by use of variable instead of constant selectivity coefficients.</p>}},
author = {{Momii, Kazuro and Hiroshiro, Yoshinari and Jinno, Kenji and Berndtsson, Ronny}},
issn = {{0361-5995}},
language = {{eng}},
number = {{6}},
pages = {{1539--1546}},
publisher = {{Soil Science Society of Americ}},
series = {{Soil Science Society of America Journal}},
title = {{Reactive solute transport with a variable selectivity coefficient in an undisturbed soil column}},
url = {{http://dx.doi.org/10.2136/sssaj1997.03615995006100060001x}},
doi = {{10.2136/sssaj1997.03615995006100060001x}},
volume = {{61}},
year = {{1997}},
}