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| Titel |
Spatial distribution of solute leaching with snowmelt and irrigation: measurements and simulations |
| VerfasserIn |
D. Schotanus, M. J. Ploeg, S. E. A. T. M. Zee |
| 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 ; 17, no. 4 ; Nr. 17, no. 4 (2013-04-22), S.1547-1560 |
| Datensatznummer |
250018856
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| Publikation (Nr.) |
 copernicus.org/hess-17-1547-2013.pdf |
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| Zusammenfassung |
Transport of a tracer and a degradable solute in a heterogeneous soil was
measured in the field, and simulated with several transient and steady state
infiltration rates. Leaching surfaces were used to investigate the solute
leaching in space and time simultaneously. In the simulations, a random field
for the scaling factor in the retention curve was used for the heterogeneous
soil, which was based on the spatial distribution of drainage in an
experiment with a multi-compartment sampler. As a criterion to compare the
results from simulations and observations, the sorted and cumulative total
drainage in a cell was used. The effect of the ratio of the infiltration rate
over the degradation rate on leaching of degradable solutes was investigated.
Furthermore, the spatial distribution of the leaching of degradable and
non-degradable solutes was compared.
The infiltration rate determines the amount of leaching of the degradable
solute. This can be partly explained by a decreasing travel time with an
increasing infiltration rate. The spatial distribution of the leaching also
depends on the infiltration rate. When the infiltration rate is high compared
to the degradation rate, the leaching of the degradable solute is similar as
for the tracer. The fraction of the pore space of the soil that contributes to solute leaching
increases with an increasing infiltration rate. This fraction is similar for
a tracer and a degradable solute. With increasing depth, the leaching becomes
more homogeneous, as a result of dispersion. The spatial distribution of the
solute leaching is different under different transient infiltration rates,
therefore, also the amount of leaching is different. With independent stream
tube approaches, this effect would be ignored. |
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