Experimental Measurement and Numerical Model of Dunes Drag Coefficients

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MOTAMEDI A.; Galoie M.

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Journal: Journal of Water and Soil Science Year:2018 | Volume:22 | Issue:2 Page(s): 29-40

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Title

Experimental Measurement and Numerical Model of Dunes Drag Coefficients

Author(s)

MOTAMEDI A. | Galoie M. | Issue Writer Certificate

Keywords

Dune dimensionsQ1

Drag CoefficientQ1

Shear VelocityQ1

Double-AveragingQ1

Abstract

In order to investigate the flow formation on dunes, the experimental data from a flume 12 meters long, located in Hydraulic Lab at Technical University of Graz (Austria), were collected. In this study, dunes (particle sizes of 13 and 6 mm) in a 2-D plan were developed with the wavelength of 1 meter, the lee angle of 8 degree, and the crest heights of 4 and 6 cm; these were uniformly installed across the width of flume. The analysis of the experimental flow velocity profiles measured by ADV and PIV technology and the numerical profiles modeled by SSIMM showed that in the same hydraulic conditions, there was no significant relation between Drag Coefficients of particles on dunes and flow discharge variation, while the water depth reduction caused a sudden increase in the Drag Coefficient up to 66%. Also, reducing particle size of the dune increased the Drag Coefficient and there was a significant relation between particle size (diameter) and dune formation, so that in smooth crested conditions, as compared with the sharp crested dune, the Drag Coefficient was increased up to 32%.

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APA: Copy

MOTAMEDI, A., & Galoie, M.. (2018). Experimental Measurement and Numerical Model of Dunes Drag Coefficients. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 22(2 ), 29-40. SID. https://sid.ir/paper/400034/en

Vancouver: Copy

MOTAMEDI A., Galoie M.. Experimental Measurement and Numerical Model of Dunes Drag Coefficients. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2018;22(2 ):29-40. Available from: https://sid.ir/paper/400034/en

IEEE: Copy

A. MOTAMEDI, and M. Galoie, “Experimental Measurement and Numerical Model of Dunes Drag Coefficients,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 22, no. 2 , pp. 29–40, 2018, [Online]. Available: https://sid.ir/paper/400034/en

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