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| Titel |
A novel explicit approach to model bromide and pesticide transport in connected soil structures |
| VerfasserIn |
J. Klaus, E. Zehe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 7 ; Nr. 15, no. 7 (2011-07-12), S.2127-2144 |
| Datensatznummer |
250012884
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| Publikation (Nr.) |
 copernicus.org/hess-15-2127-2011.pdf |
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| Zusammenfassung |
| The present study tests whether an explicit treatment of worm burrows and
tile drains as connected structures is feasible for simulating water flow,
bromide and pesticide transport in structured heterogeneous soils at
hillslope scale. The essence is to represent worm burrows as morphologically
connected paths of low flow resistance in a hillslope model. A recent Monte
Carlo study (Klaus and Zehe, 2010, Hydrological Processes, 24, p. 1595–1609)
revealed that this approach allowed successful reproduction of tile drain
event discharge recorded during an irrigation experiment at a tile drained
field site. However, several "hillslope architectures" that were all
consistent with the available extensive data base allowed a good
reproduction of tile drain flow response. Our second objective was thus to
find out whether this "equifinality" in spatial model setups may be
reduced when including bromide tracer data in the model falsification
process. We thus simulated transport of bromide for the 13 spatial model
setups that performed best with respect to reproduce tile drain event
discharge, without any further calibration. All model setups allowed a very
good prediction of the temporal dynamics of cumulated bromide leaching into
the tile drain, while only four of them matched the accumulated water
balance and accumulated bromide loss into the tile drain. The number of
behavioural model architectures could thus be reduced to four. One of those
setups was used for simulating transport of Isoproturon, using different parameter
combinations to characterise adsorption according to the Footprint data
base. Simulations could, however, only reproduce the observed leaching
behaviour, when we allowed for retardation coefficients that were very close
to one. |
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