 |
| Titel |
Suspended sediment concentration–discharge relationships in the (sub-) humid Ethiopian highlands |
| VerfasserIn |
C. D. Guzman, S. A. Tilahun, A. D. Zegeye, T. S. Steenhuis |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 3 ; Nr. 17, no. 3 (2013-03-11), S.1067-1077 |
| Datensatznummer |
250018824
|
| Publikation (Nr.) |
 copernicus.org/hess-17-1067-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Loss of top soil and subsequent filling up of reservoirs in much of the
lands with variable relief in developing countries degrades environmental
resources necessary for subsistence. In the Ethiopia highlands, sediment
mobilization from rain-fed agricultural fields is one of the leading factors
causing land degradation. Sediment rating curves, produced from long-term
sediment concentration and discharge data, attempt to predict suspended
sediment concentration variations, which exhibit a distinct shift with the
progression of the rainy season. In this paper, we calculate sediment rating
curves and examine this shift in concentration for three watersheds in which
rain-fed agriculture is practiced to differing extents. High sediment
concentrations with low flows are found at the beginning of the rainy season
of the semi-monsoonal climate, while high flows and low sediment
concentrations occur at the end of the rainy season. Results show that a
reasonably unique set of rating curves were obtained by separating biweekly
data into early, mid, and late rainfall periods and by making adjustments
for the ratio of plowed cropland. The shift from high to low concentrations
suggests that diminishing sediment supply and dilution from greater base
flow during the end of the rainfall period play important roles in
characterizing changing sediment concentrations during the rainy season. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|