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| Titel |
The effect of slope steepness and antecedent moisture content on interrill erosion, runoff and sediment size distribution in the highlands of Ethiopia |
| VerfasserIn |
M. B. Defersha, S. Quraishi, A. Melesse |
| 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 (2011-07-22), S.2367-2375 |
| Datensatznummer |
250012899
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| Publikation (Nr.) |
 copernicus.org/hess-15-2367-2011.pdf |
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| Zusammenfassung |
| Soil erosion is a two-phase process consisting of the detachment of
individual particles and their transport by the flowing water. This study
discusses the results of laboratory experiments in which for three soils,
the runoff depth, sediment yield, splash erosion and sediment size were
measured. Rainfall intensity, slope and antecedent moisture contents were
varied in the experiment. The soil types ranged from clay to sandy clay loam
(Alemaya Black soil, Regosols and Cambisols). Rainfall was applied for six
sequential 15-min periods with rainfall intensities varying between 55
and 120 mm h−1. The three slopes tested were 9, 25, and 45 %. Results show
that as slope increased from 9 to 25 %, splash erosion and sediment yield
increased. An increase in slope from 25 to 45 % generally decreases in
splash erosion. Sediment yield for one soil increased and one soil decreased
with slope and for the third soil the trend was different between the two
initial moisture contents. Sediment yield was correlated (r = 0.66) with
runoff amounts but not with splash erosion. Interrill erosion models that
were based on the flowing water and rainfall intensity fitted the data
better than when based on rainfall intensity solely. Models that assume a positive
linear relationship between erosion and slope may overestimate sediment
yield. |
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