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| Titel |
A simple model for predicting solute concentration in agricultural tile lines shortly after application |
| VerfasserIn |
T. S. Steenhuis, M. Bodnar, L. D. Geohring, S.-A. Aburime, R. Wallach |
| 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 ; 1, no. 4 ; Nr. 1, no. 4, S.823-833 |
| Datensatznummer |
250000237
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| Publikation (Nr.) |
 copernicus.org/hess-1-823-1997.pdf |
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| Zusammenfassung |
| Agricultural tile drainage lines have been implicated
as a source of pesticide contamination of surface waters. Field experiments were conducted and a simple model
was developed to examine preferential transport of applied chemicals to agricultural
tile lines. The conceptual model consists of two linear reservoirs, one near the soil surface
and one near the tile drain. The connection between the two reservoirs is via preferential flow paths
with very little interaction with the soil matrix. The model assumes that only part of the field
contributes solutes to the tile drain. The model was evaluated with data from the field experiments
in which chloride, 2,4-D, and atrazine concentrations were measured on eight tile-drained plots
that were irrigated twice. Atrazine was applied two months prior to the experiment, 2,4-D was
sprayed just before the first irrigation, and chloride before the second irrigation. All three chemicals
were found in the tile effluent shortly after the rainfall began. Generally, the concentration
increased with increased flow rates and decreased exponentially after the rainfall ceased. Although
the simple model could simulate the observed chloride concentration patterns in the
tile outflow for six of the eight plots, strict validation was not possible because of the difficulty
with independent measurement of the data needed for a preferential flow model applied to field conditions.
The results show that, to simulate pesticide concentration in tile lines, methods that
can measure field averaged preferential flow characteristics need to be developed. |
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