Author(s): G. C. Christodoulou; E. Kostidou; P. Vassilakos
Linked Author(s): George Christodoulou
Keywords: No Keywords
Abstract: An experimental study is presented of flow over various kinds of submerged artificial large scale roughness elements in a channel of 16. 5% slope with supercritical approach flow. Eight different shapes of obstacles are tested, namely standard baffle blocks, cubes, half-cubes, vertical plates, cylinders, thin rods, and half–spheres parallel or normal to the flow; their density along the bottom is also variable. Based on depth measurements, the effective Manning’s roughness coefficient n as well as the Darcy-Weisbach’s friction factor f are determined for a range of discharges. The results are presented in nondimensional plots and the effect of main geometrical parameters on flow resistance is discussed.
Year: 2012