What is it about?
In this study, we calibrated and validated Manning’s n roughness coefficient using HEC-RAS for Sarimsakli creek that is tributary of the Kizilirmak river in central Anatolia, Turkey. For calibration of Manning’s n-values, six different flow regimes were considered based on mean daily flow records between 2005 and 2010. We found that calculated water surface profiles for different Manning’s n are slightly lower than the measured one, that indicates a continuous underestimation of the roughness coefficient n by the model. Therefore, our results suggest that higher values of Manning’s n should be considered in case of the intermittent rivers. A polynomial relationship was proposed between roughness values and Froude numbers. Finally, a linear relation was established between calculated and measured Manning’s n roughness coefficient. Nevertheless, results showed that careful attention should be given to higher n-values because the differences between HEC-RAS and Manning’s n becomes larger.
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Why is it important?
Solution-oriented results obtained and the methodology applied to the Sarimsakli creek may serve as a practical reference for HEC-RAS modelling and flood prediction in intermittent rivers.
Perspectives
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This page is a summary of: Calibration of channel roughness in intermittent rivers using HEC-RAS model: case of Sarimsakli creek, Turkey, SN Applied Sciences, August 2019, Springer Science + Business Media,
DOI: 10.1007/s42452-019-1141-9.
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