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@ARTICLE{Abbasi:48373,
author = {Abbasi, F. and Javaux, M. and Vanclooster, M. and Feyen, J.
and Wyseure, G. and Nziguheba, G.},
title = {{E}xperimental study of water flow and sulphate transport
at monolith scale},
journal = {Agricultural water management},
volume = {79},
issn = {0378-3774},
address = {Amsterdam},
publisher = {Elsevier},
reportid = {PreJuSER-48373},
pages = {93 - 112},
year = {2005},
note = {Record converted from VDB: 12.11.2012},
abstract = {In this study, sulphur transport processes and effect of
flow rate on sulphate breakthrough curves (BTCs) were
studied on six undisturbed large soil monoliths (each having
roughly a volume of 0.5 m(3)), collected from two different
agricultural soils being loamy and sandy loam. In the
laboratory, each monolith was equipped with different
measuring devices to monitor soil water content, bulk soil
electrical conductivity (ECa), soil temperature, pressure
head, outlet flux, and pH. Four unsaturated steady state
experiments were carried out on each monolith using two
different imposed fluxes (referred to as low and high).
First a chloride breakthrough experiment was performed to
identify the basic transport processes followed by sulphate
breakthrough experiment for the identification of the
important sulphate transport processes. Water and solute
(chloride and sulphate) mass balances were made to evaluate
effective sulphate transformations at the scale of the
monolith. The relative water mass balance errors ranged
between $-4.0\%$ and $5.0\%.$ The chloride mass balances
were almost as good as those obtained for water, whereas the
sulphate mass balance revealed that sulphate was subjected
to adsorption and immobilization during the transport. The
high flux sulphate experiments resulted in relatively large
mass balance discrepancies compared to the low flux sulphate
experiments. The sulphate breakthrough curves (BTCs) were
somewhat retarded in the loamy monoliths whereas both
chloride and sulphate BTCs were significantly affected by
preferential flow in the sandy loam monoliths. Standard
batch experiments showed that the adsorption isotherm was
linear and immobilization occurred in both soils studied
whereas net mineralization was essentially low. The effect
of flow rate on the BTCs and influence of water content on
immobilization process was not apparent. (c) 2005 Elsevier
B.V. All rights reserved.},
keywords = {J (WoSType)},
cin = {ICG-IV},
ddc = {630},
cid = {I:(DE-Juel1)VDB50},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Agronomy / Water Resources},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000234628900005},
doi = {10.1016/j.agwat.2005.07.032},
url = {https://juser.fz-juelich.de/record/48373},
}