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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Technology >
Thesis - Hydraulics Engineering >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/123456789/2335
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| Title: | Regional Flood Frequency analysis for upper Omo-Gibe sub-basin |
| Authors: | Tamiru, Gedefa |
| Advisors: | Dr. Yilma Seleshi |
| Keywords: | Hydrolics Engineering |
| Copyright: | Jun-2009 |
| Date Added: | 3-May-2012 |
| Publisher: | AAU |
| Abstract: | Accurate and reliable estimates of the magnitude and frequency of floods are critical for such
activities as bridge design, flood-plain delineation and management, water-supply management,
and management of water-control structures, among others.This can be done using statistical
method called frequency analysis. The overall objective of the study was to find an appropriate
procedure and to select suitable distribution for analysis of flood frequency at-site and regional
and also to develop a relationship between scaled quantiles ( QT/Qmean) and return period T,
called a growth curve for use in the upper Omo-Gibe sub-basin.
In this study, at-site and regional flood frequency analysis are applied to the selected annual
maximum stream flood observed at 19 gauged stations with an average of 27 record lengths of
years in upper Omo-Gibe sub-basin using index flood estimation procedure. Screening of time
series data (especially discharge data) were done for independence, homogeneity, and
randomness using Serial-Correlation Coefficient, double mass curve and Runs test respectively.
Four stations are failed to pass the above tests, namely Rabu Nr. Wolkite, Nono at Darghe,
Aweitu at Jimma and Gibe Nr. Limu-Genet stations. Stations, which failed to pass these test were
discarded from further analysis.
Even though, there are many ways of identifying of homogeneous regions, in this study statistical
homogeneity tests (convectional and L-moment based tests) have been used along with
geographical similarity. Accordingly, upper Omo-Gibe sub-basin has been divided in to two
homogeneous regions. The first region identified includes the Wabe, Warabessa, Kuliti, Derghe,
Megecha, Gogheb, Gibe-Bako, and Walga stations and the second region compresses Gojeb-
Shebe ,Gilgel Gibe-Asandabo, Gilgel Gibe-Seka , Great Gibe-Abelti , Kitto-Jimma and Bulbula-
Serbo stations. |
| URI: | http://hdl.handle.net/123456789/2335 |
| Appears in: | Thesis - Hydraulics Engineering
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| 93 | | 1.62 MB | Adobe PDF | View/Open |
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