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| Titel |
Use of rare earth oxides as tracers to identify sediment source areas for agricultural hillslopes |
| VerfasserIn |
C. Deasy, J. N. Quinton |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 1, no. 1 ; Nr. 1, no. 1 (2010-11-26), S.111-118 |
| Datensatznummer |
250000123
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| Publikation (Nr.) |
 copernicus.org/se-1-111-2010.pdf |
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| Zusammenfassung |
| Understanding sediment sources is essential to enable more
effective targeting of in-field mitigation approaches to reduce diffuse
pollution from agricultural land. In this paper we report on the application
of rare earth element oxides to arable soils at hillslope scale in order to
determine sediment source areas and their relative importance, using a
non-intrusive method of surface spraying. Runoff, sediments and rare earth
elements lost from four arable hillslope lengths at a site in the UK with
clay soils were monitored from three rainfall events after tracer
application. Measured erosion rates were low, reflecting the typical event
conditions occurring at the site, and less than 1% of the applied REO
tracers were recovered, which is consistent with the results of comparable
studies. Tracer recovery at the base of the hillslope was able to indicate
the relative importance of different hillslope sediment source areas, which
were found to be consistent between events. The principal source of eroded
sediments was the upslope area, implying that the wheel tracks were
principally conduits for sediment transport, and not highly active sites of
erosion. Mitigation treatments for sediment losses from arable hillslopes
should therefore focus on methodologies for trapping mobile sediments within
wheel track areas through increasing surface roughness or reducing the
connectivity of sediment transport processes. |
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