Measurement and modeling of solitary wave induced bed shear stress over a rough bed

Seelam, Jaya Kumar and Baldock, Tom E. (2012). Measurement and modeling of solitary wave induced bed shear stress over a rough bed. In: Patrick Lynett and Jane McKee Smith, Proceedings of the 33rd Conference on Coastal Engineering. International Conference on Coastal Engineering (ICCE2012), Santander, Spain, (1-15). 1-6 July 2012. doi:10.9753/icce.v33.waves.21

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Author Seelam, Jaya Kumar
Baldock, Tom E.
Title of paper Measurement and modeling of solitary wave induced bed shear stress over a rough bed
Conference name International Conference on Coastal Engineering (ICCE2012)
Conference location Santander, Spain
Conference dates 1-6 July 2012
Proceedings title Proceedings of the 33rd Conference on Coastal Engineering   Check publisher's open access policy
Journal name Proceedings of the Coastal Engineering Conference   Check publisher's open access policy
Place of Publication United States
Publisher Coastal Engineering Research Council
Publication Year 2012
Sub-type Fully published paper
DOI 10.9753/icce.v33.waves.21
Open Access Status File (Publisher version)
ISBN 9780989661119
ISSN 2156-1028
Editor Patrick Lynett
Jane McKee Smith
Volume 33
Start page 1
End page 15
Total pages 15
Collection year 2013
Language eng
Abstract/Summary Bed shear stresses generated by solitary waves were measured using a shear cell apparatus over a rough bed in laminar and transitional flow regimes (~7600 < Re < ~60200). Modeling of bed shear stress was carried out using analytical models employing convolution integration methods forced with the free stream velocity and three eddy viscosity models. The measured wave height to water depth (h/d) ratio varied between 0.13 and 0.65; maximum near- bed velocity varied between 0.16 and 0.47 m/s and the maximum total shear stress (sum of form drag and bed shear) varied between 0.565 and 3.29 Pa. Wave friction factors estimated from the bed shear stresses at the maximum bed shear stress using both maximum and instantaneous velocities showed that there is an increase in friction factors estimated using instantaneous velocities, for non-breaking waves. Maximum positive total stress was approximately 2.2 times larger than maximum negative total stress for non-breaking waves. Modeled and measured positive total stresses are well correlated using the convolution model with an eddy viscosity model analogous to steady flow conditions (nu_t=0.45u* z1; where nu_t is eddy viscosity, u* is shear velocity and z1 is the elevation parameter related to relative roughness). The bed shear stress leads the free stream fluid velocity by approximately 30° for non-breaking waves and by 48° for breaking waves, which is under-predicted by 27% by the convolution model with above mentioned eddy viscosity model.
Keyword Bed shear stress
Rough bed
Bed roughness
Shear plate
Friction factors
Solitary wave
Q-Index Code EX
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Wed, 23 Jan 2013, 11:16:24 EST by Julie Hunter on behalf of School of Civil Engineering