American Society of Civil Engineers


Turbulent Bed Shear Stress under Symmetric and Asymmetric Waves: Experimental and Numerical Results


by Alvaro Galan, (corresponding author), (Ph.D. Candidate, Junta Ampliación de Estudios program, Instituto Mediterráneo de Estudios Avanzados (Consejo Superior de Investigaciones Científicas-Universidad de Islas Baleares), Carrer Miquel Marques 21, 07190 Esporles, Spain E-mail: a.galan@uib.es), Gonzalo Simarro, (Associate Professor, Dept. of Civil Engineering, Univ. of Castilla-La Mancha, Avenida Camilo Jose Cela s/n, 13071 Ciudad Real, Spain. E-mail: gonzalo.simarro@uclm.es), and Alejandro Orfila, (Tenured Scientist, Instituto Mediterráneo de Estudios Avanzados (Consejo Superior de Investigaciones Científicas-Universidad de Islas Baleares), Carrer Miquel Marques 21, 07190 Esporles, Spain. E-mail: a.orfila@uib.es)

Journal of Hydraulic Engineering, Vol. 137, No. 9, September 2011, pp. 986-994, (doi:  http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000384)

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Document type: Journal Paper
Abstract: A new instrument built to directly measure the bottom shear stress under different conditions of periodic waves is presented. Similar to classical Taylor’s cylindrical viscosimeter, the instrument is formed by two concentric cylinders, and the space between them is filled with water. The internal cylinder is fixed whereas the external cylinder, with a specific roughness, rotates following a given unsteady velocity time history. The shear stress at the outer cylinder wall is measured by using a torque meter. Both monochromatic and sawtooth-shaped waves have been tested, and the experimental shear stress time histories were compared with the results obtained from a numerical model.


ASCE Subject Headings:
Boundary layer flow
Friction
Coefficients
Cylinders
Shear stress
Waves

Author Keywords:
Bottom boundary layer
Wave friction coefficient
Sawtooth waves