El-Hadi Adam, Barsi B.I., Mohamed Y.A.


Gash River, in Eastern Sudan - Kassala state, is a seasonal flashy river. It originates from the Ethiopian-Eritrean highland and flows towards Sudan. The absence of reliable observed data in the catchment made the rainfall-runoff study a challenging task. This study is an attempt to test the potentiality for using satellite derived data for hydrological modelling in the river basin. Two Satellite Rainfall Estimate (SRE) data sets were used from two different sources namely; Tropical Rainfall Measurement Mission (TRMM-3B42RT) and Global Satellite Mapping of Precipitation (GSMaP_NRT). Observed hydrograph at the catchment outlet was compared to the areal average SRE from the two
data sets for daily and/or hourly time steps. For more than 80 % of the storm events, the comparison of the peak rainfalls with the peak discharges showed a reasonable agreement. This result reflects the high potential for SRE data sets to be used as input for hydrological modeling and flood forecasting in Gash river and other basins with similar characteristics.
The Hydrologic Engineering Center’s Hydrologic Modeling System (HEC-HMS) software of the Army Corps of Engineering of the USA can be used as a forecasting tool.


Gash Basin; Flash flood Forecasting; Rainfall-runoff modeling; HEC-HMS; TRMM

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