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Investigation of Particle-Size Distribution and Friction Factor for a Gravel-Bed river: Marbar
Journal: Journal of River Engineering
Issue: Journal of River Engineering (Volume: 2, Issue: 3)
Author: zahra oreizi , hossein Afzalimehr , Vijay p Singh , saeid okhravi
Keywords : Gravel Rivers , Morphology , Friction Factor , Bed Form , Pool-Riffle Sequence

The study of flow and sediment size distribution in gravel –bed Rivers has been the pivotal attention of many researchers for more than three decades. The surface grain size of gravel and cobble-bed rivers reflects the caliber and volume of sediment that is supplied to the channel and magnitude of discharge events that are capable of moving sediment. Also, defining friction factor, the relationship between the mean shear velocity and the mean flow velocity in rivers, has been a central problem in river studies for a very long time, but it continues to defy a complete analytical solution. Most of rivers in Zagros Mountains located in the central Iran consist of gravel and cobble-bed Rivers showing very difficult flow measurements and various grain size distributions. In this paper, two reaches were selected to investigate the particle-size distribution and friction factor estimation of Marbar River. The results showed that particles stability in pools is due to their larger median diameter in comparison to riffles. The contribution of form friction factor is more important than skin friction in Marbar river.

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Mahdi Moharrampour
Prof. Abdolkarim Behnia