Sediment Transport Modeling at the Oued Fodda Watershed Level Using HEC-RAS 1D Software

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Boualem REMINI


The objective of the current work is to determine the amount of sediments transported upstream and at the ‎level of Oued Fodda dam. The latter is considered one of the first large dams built in Algeria. It’s ‎exposed to a serious siltation problem that ‎reduces its capacity every year. The simulation was executed ‎using the HEC-RAS software, for the period varied from January 01, 2016 to April 30, 2016. The ‎modeled section consisted of about 9999 m length, subdivided into 141 river stations distant from each ‎other by 70 m. The ‎observation of the studied river section bed- profile was selected as a criterion ‎for ‎comparing the results of the model with the real values observed. A roughness ‎coefficient of 0.031 ‎was used. A quantitative estimate with a determination coefficient, R2, of 0.92 was used to support the ‎validity‎. The mass and concentration of sediments increased significantly in the cross-sections ‎located ‎at ‎the dam upstream.‎ A total cumulative mass was estimated at approximately 712699 tons, just upstream of ‎the dyke, and a maximum concentration of 22.35 g/l was observed, particularly for three main sections ‎selected upstream of the Fodda wadi. However, at the reservoir level, the concentration variability is ‎observed during flood periods, i.e., only for the most important flows.‎

Keywords: GIS; HEC-RAS; Oued Fodda dam; Sediment transport; Siltation.

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How to Cite
BENKACI, S., & REMINI, B. (2023). Sediment Transport Modeling at the Oued Fodda Watershed Level Using HEC-RAS 1D Software. GeoScience Engineering, 69(2), 160–178.
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