Calculation sedimentation by sediment modelling using HEC-RAS

Abstract

Sedimentation in dams can be harmful and shorten the dam’s life especially when the sediment transport process is fast which the dam is constructed on it. It should be known the results of transportation. Seyhan Dam constructed in the mid-1950s is one of the important dams of Turkiye and stays at the border of Seyhan River Basin. Çakıtsuyu Creek is tributary of Seyhan River which flows from the northwest side and discharges its waters to the dam reservoir. Sediment transport modelling was simulated on Çakıtsuyu Creek in the HEC-RAS environment in this study. The stream’s bed material was also assessed with the field study. The results of the sediment transport of one year simulation were calibrated and validated with the sediment monitoring station’s results. Therefore, the sedimentation in the dam reservoir was calculated from that modelling. According to the results that totally 75,251.0 tonnes of sediment was deposited to the Seyhan Dam Reservoir within a year both bed load and suspended load, 11,995.0 tonnes and 63,256.0 tonnes respectively. As a result, approximately 84% of the total load was suspended load and 16% was bed load. © 2025 The Author(s).