Numerical Modeling of Tsunami Wave Run-Up and Effects on Sediment Scour around a Cylindrical Pier
Publication: Journal of Engineering Mechanics
Volume 138, Issue 10
Abstract
The linked two-dimensional hydrodynamic and sediment-scour models have been enhanced to simulate tsunami wave run-up on a sloping beach to determine its effects on sediment scour around a cylinder pier located in the wave breaking and run-up zone. To resolve the steep wavefront of the tsunami bore, the kinetic flux vector splitting scheme was adopted to solve the hydrodynamic model equations in the unstructured triangular mesh. The models have been validated by comparing model simulations with experimental data. The results indicate that the model predictions of water surface elevations and velocity match well with the measured data. The error for peak flood elevation ranges from 0.01 to 0.11 m, and the maximum error for the peak velocity is 6%. The model simulations adequately characterize the tsunami wave propagations and transformations as the wave approaches the beach from offshore, especially for the sharp tsunami front before it breaks and the tsunami bore runs up in the beach slope. The model simulations also reasonably describe the dynamics of the sediment scour around a cylinder pier, showing the sediment scour during wave run-up and sediment deposition during wave rundown. The Model predictions of the final scour depths after the wave impact at three measurement stations reasonably matched the experimental measurements.
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Acknowledgments
This study was partially supported by the Visiting Scholar Program of Zhejiang Province of China, the Florida State University, the National Science Foundation of China (No. 10772163), the Ministry of Water Resources special funds for scientific research on public causes (No. 201001072), and the Guanghua Fund of Tongji University.
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Published In
Journal of Engineering Mechanics
Volume 138 • Issue 10 • October 2012
Pages: 1224 - 1235
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 22, 2010
Accepted: Jan 18, 2012
Published online: Sep 14, 2012
Published in print: Oct 1, 2012
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