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| Titel |
Rain event properties at the source of the Blue Nile River |
| VerfasserIn |
A. T. Haile, T. H. M. Rientjes, E. Habib, V. Jetten, M. Gebremichael |
| 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. 3 ; Nr. 15, no. 3 (2011-03-24), S.1023-1034 |
| Datensatznummer |
250012698
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| Publikation (Nr.) |
 copernicus.org/hess-15-1023-2011.pdf |
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| Zusammenfassung |
| In the present study, spatial and temporal patterns of rain event properties
are analysed. These event properties are rain event depth, event duration,
mean event rain rate, peak rain rate and the time span between two
consecutive rain events which is referred to as inter-event time (IET). In
addition, we assessed how rain event properties change when the period over
which rainfall data is aggregated changes from 1 to 6 min and when the
minimum inter-event time (MIT) changes from 30 min to 8 h. Rainfall data is
obtained from a field campaign in two wet seasons of June–August (JJA) of
2007 and 2008 in Gilgel Abbay watershed that is situated at the source basin
of the Upper Blue Nile River in Ethiopia. The rainfall data was
automatically recorded at eight stations. The results revealed that rain
event depth is more related to peak rain rate than to event duration. At the
start and towards the end of the wet season, the rain events have larger
depth with longer duration and longer IET than those in mid-season. Event
rain rate and IET are strongly related to terrain elevation. Sekela which is
on a mountain area has the shortest IET while Bahir Dar which is at the
south shore of Lake Tana has the longest IET. The period over which rainfall
data is aggregated significantly affected the values of rain event
properties that are estimated using relatively small value (30 min) of MIT
but its effect diminished when the MIT is increased to 8 h. It is shown
that increasing the value of MIT has the largest effect on rain event
properties of mountain stations that are characterised by high rainfall
intermittency. |
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