Daily Rainfall-Runoff Modeling for the Beles River Catchment.
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Date
2009-05
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Addis Ababa University
Abstract
For an effective and sustainable water resource planning and management, the
need for complete and reliable hydrological and meteorological data is
unquestionable. To get such data there is a need to develop and maintain
hydrometric stations in proper networks.
Presently in Ethiopia most of the available gauging stations are located nearby
access roads. Because of this situation, most of the rivers which are inaccessible
to roads are not gauged. Beles River basin, a sub-basin of the Abay basin, is a
basin whose vast area is ungauged, as there are only two gauging stations on its
upper part and all its lower parts are ungauged.
In this research hydrological models are used to solve the above indicated
problem on the Beles sub-basin. Three Rainfall- Runoff Models are tested on the
upper Beles catchment, namely the RRL SMAR, RRL Sacramento and RRL
Tank models. For all these models calibration and validation are done using the
required input data. Evaluation and selection of suitable model for the catchment
is carried out following the objective criteria: Nash-satcliffe efficiency (Reff);
Efficiency using ln(Q) (logReff); and Coefficient of determination (R2).
The RRL Sacramento Model scored the best result among the three Models for
all objective functions, and therefore it is selected. Since upper and lower Beles
are hydrologically homogenous, the calibrated RRL Sacramento model for the
upper Beles are used to the ungauged catchment of Lower Beles without
changing its parameter.
However, the Sacramento Model result by itself is not found satisfactory, since
there is no meteorological station on the Beles catchment and the data used for
this study is by transferring data from nearby station, considering the distance
between the station and the catchments area. This kind of transferred data can
not be the same as the real station data, creating low performance the model.
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Keywords: unguaged, Beles, model, gauged, RRL SMAR, RRL TANK, RRL
Sacramento, catchment, Calibration, Validation.
Description
Keywords
Unguaged, Beles Model; Gauged; RRL SMAR; RRL TANK; RRL Sacramento; Catchment; Calibration; Validation