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|Title: ||HYDROLOGICAL MODELS COMPARISON FOR ESTIMATION OF FLOODS IN THE ABAYA-CHAMO SUB-BASIN|
|Authors: ||Abyot, Ayka|
|Advisors: ||Dr. Yilma Sileshi|
|Keywords: ||Abaya-Chamo river basin|
Ungauged catchment, floods
|Copyright: ||Jul-2008 |
|Date Added: ||10-May-2012 |
|Abstract: ||Nowadays the major environmental disasters in Ethiopia are recurrent
droughts and floods. Their socio-economic and ecological impacts are
devastating to the entire country, because most of them do not have real
time forecasting technology or resource for post disaster rehabilitation.
The Abaya-Chamo river basin is located in the southern part of Ethiopia.
The extensive and attractable areas of this region, apart from being
densely populated and extensively used for agriculture are also
considered as a flood prone. Since most of the rivers in the basin are
ungauged, it is essential to now the flow characteristics of the rivers in
order to mitigate flooding effects in the basin.
The aim of this study is to test the three conceptual hydrological models
and propose suitable model for the estimation of floods in the ungauged
catchments of the basin. Two catchments; Kulfo catchment from medium
sized and Bilate catchment from large sized catchments, are selected for
Model approaches selected are: Soil Moisture Accounting (SMA) model
which is embedded in the HEC-HMS software suite. SMA is a lumped,
simulation and a number of model parameters are estimated.
The other two models RRL SMAR & RRL TANK models are conceptual
continuous daily time series models. Default values of all the parameters
Using various models performance evaluation criteria; Nash-Sutcliffe
Coefficient of determination R2, index of volumetric fit IVF and The
relative error of the peak, the output of each models was evaluated.
HEC-HMS SMA model performed well compared to the other models
especially with the objective of capturing the peak flow and volumetric fit
IVF in the two catchments.
Thus, the HEC-HMS SMA model can be used for the estimation of peak
floods in the two catchments and in the ungauged catchments with or
Model uncertainties due to various sources such as improper data input,
incorrect model parameterization are also highlighted in the end of this
|Appears in:||Thesis - Hydraulics Engineering |
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