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Open AccessFeature PaperArticle

A Comparative Study of Water and Bromide Transport in a Bare Loam Soil Using Lysimeters and Field Plots

1
UMR 7327 ISTO, Centre national de la recherche scientifique (CNRS), Université d’Orléans, 45071 Orleans, France
2
UE SEAV, Institut national de la recherche agronomique (INRA), 68021 Colmar, France
3
LHyGeS, Université de Strasbourg/EOST—CNRS, 67000 Strasbourg, France
4
UMR 1402 ECOSYS, AgroParisTech, INRA, 78850 Thiverval-Grignon, France
*
Authors to whom correspondence should be addressed.
Water 2019, 11(6), 1199; https://doi.org/10.3390/w11061199
Received: 3 May 2019 / Revised: 30 May 2019 / Accepted: 3 June 2019 / Published: 8 June 2019
The purpose of this methodological study was to test whether similar soil hydraulic and solute transport properties could be estimated from field plots and lysimeter measurements. The transport of water and bromide (as an inert conservative solute tracer) in three bare field plots and in six bare soil lysimeters were compared. Daily readings of matric head and volumetric water content in the lysimeters showed a profile that was increasingly humid with depth. The hydrodynamic parameters optimized with HYDRUS-1D provided an accurate description of the experimental data for both the field plots and the lysimeters. However, bromide transport in the lysimeters was influenced by preferential transport, which required the use of the mobile/immobile water (MIM) model to suitably describe the experimental data. Water and solute transport observed in the field plots was not accurately described when using parameters optimized with lysimeter data (cross-simulation), and vice versa. The soil’s return to atmospheric pressure at the bottom of the lysimeter and differences in tillage practices between the two set-ups had a strong impact on soil water dynamics. The preferential flow of bromide observed in the lysimeters prevented an accurate simulation of solute transport in field plots using the mean optimized parameters on lysimeters and vice versa. View Full-Text
Keywords: field plots; lysimeters; optimization; inverse method; hydrodynamic parameters; cross simulations field plots; lysimeters; optimization; inverse method; hydrodynamic parameters; cross simulations
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MDPI and ACS Style

Isch, A.; Montenach, D.; Hammel, F.; Ackerer, P.; Coquet, Y. A Comparative Study of Water and Bromide Transport in a Bare Loam Soil Using Lysimeters and Field Plots. Water 2019, 11, 1199.

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