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Volume :33 Issue : 1 2006      Add To Cart                                                                    Download

Shear stress distributions along the cross section in smooth and rough open channel flows

Auther : MEHMET ARDIاLIOĞLU1, GALİP SEاKİN2, AND RECEP YURTAL2

1Department of Civil Engineering, Faculty of Engineering, The Erciyes University, Kayseri, Turkey, Tel: (+90) 352 4370080, E-mail: mardic@erciyes.edu.tr

2Department of Environmental and Civil Engineering, Faculty of Engineering, The اukurova University, Adana, Turkey.

 

ABSTRACT

 

Distributions of shear stresses throughout the entire cross-section within the fully developed boundary layer region in both the smooth and rough surfaces of a rectangular open channel flow were experimentally determined. Velocity measurements were taken for two different surfaces and 48 flow conditions with Froude numbers in the range: 0.12 £ Fr £ 1.23 and with aspect ratios within: 4.2 £ b/h £ 21.6. For all the flow conditions created in the setup, the local shear stress was computed using the universal logarithmic distribution. The relationships between the mean cross sectional shear stresses and the aspect ratio, and Froude numbers were determined for both smooth and rough surfaces. For all the flow conditions formed in the setup, the shear stress distribution along the cross section was succinctly expressed by a second degree polynomial. The maximum shear stress on the bed was found to be about        6-20% greater than the mean bed shear stress for smooth surfaces and 2–16% grater for rough surfaces, respectively.

Keywords: open channel flow, shear stress distributions, smooth and rough surfaces

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