Investigation of Particle-Size Distribution and Friction Factor for a Gravel-Bed river: Marbar
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 3
Abstract
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.
Authors and Affiliations
zahra oreizi - hossein Afzalimehr - Vijay p Singh - saeid okhravi
Evaluating the Suspended Sediment of Mahabad Dam Using Statistical Methods
Dam construction is one of the methods for storing surface water. Estimating the service life and economic efficiency of dam is one of the most important cases in estimating the design of it. The most important proble...
Experiments on Inclined Negatively Buoyant Jets in Shallow Streams
Experimental runs of discharge of saltwater solution inclined at six different angles of 30°, 45°, 60°, 75°, 90° and 115° to the horizontal for three ratios of jet’s initial velocity to mean ambient fluid velocity and...
The Effect of Semi-circular Side Weirs on Hydraulic Properties and Discharge Coefficient of Side Weirs
Side weir is one of the most common hydraulic structures, which is used as a deviatory structure in rivers, irrigation and drainage channels and also in urban sewage collection systems.Semi-circular side weir can be a...
3D Simulation of Flow over a Triangular Broad-Crested Weir
On natural streams where it is necessary to measure wide range of discharges, a triangular control has several advantages. Firstly, it provides a large breadth at high flows, so that the backwater effect is not excessive...
Determination of the Best Model for Flood Flows in the Western Basin of Lake Urmia
Today, the management of water resources has been taken into consideration based on sustainable development in the world. Natural events such as floods have been among human problems in the past and present and hydrol...