Vertical Cylinder Density and Toppling Effects on Dune Erosion and Overwash
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141, Issue 1
Abstract
Interactions among waves, sand dunes, and vertical cylinders are investigated in a laboratory experiment. A cross-shore numerical model is expanded to include the drag force acting on cylinders. The hydrodynamic variables modified by the cylinders are used to predict bed load and suspended sand transport rates. The expanded model is compared with five previous tests. The drag coefficient is calibrated to obtain similar agreement for the dunes with and without the cylinders. Four tests were conducted to examine the placement density and toppling of the cylinders. The effectiveness of the cylinders in reducing dune erosion and overwash decreased significantly with the density decrease and cylinder toppling. The reduced effectiveness is reproduced by the expanded model with the calibrated drag coefficient. However, a simple toppling criterion needs to be adjusted for each test for the reproduction of the observed landward progression of cylinder toppling during the dune profile evolution. Field data will be required to improve the model for real woody plants.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This study was supported partly by the European Union under the THESEUS Project and the U.S. Army COE under Contract No. W911XK-13-P-0065. The first author was supported by the Scientific and Technological Research Council of Turkey during her 1-year stay at the Center for Applied Coastal Research, University of Delaware, Newark, Delaware.
References
Edge, B. L., et al. (2010). “Immediate impacts of Hurricane Ike on the Texas Coast.” Proc., 32nd Conf. on Coastal Engineering, J. M. Smith and P. Lynett, eds., Vol. 5, Curran Associates, Red Hook, NY, 3552–3567.
Figlus, J., Kobayashi, N., and Gralher, C. (2012). “Onshore migration of emerged ridge and ponded runnel.” J. Waterway, Port, Coastal, Ocean Eng., 331–338.
Figlus, J., Kobayashi, N., Gralher, C., and Iranzo, V. (2011). “Wave overtopping and overwash of dunes.” J. Waterway, Port, Coastal, Ocean Eng., 26–33.
Gralher, C., Kobayashi, N., and Do, K. (2012). “Wave overwash of vegetated dunes.” Proc., 33rd Conf. on Coastal Engineering, P. Lynett and J. M. Smith, eds., Vol. 4, Curran Associates, Red Hook, NY, 3740–3746.
Horstman, E., et al. (2012). “Wave attenuation in mangrove forests: Field data obtained in Trang, Thailand.” Proc., 33rd Conf. on Coastal Engineering, P. Lynett and J. M. Smith, eds., Vol. 5, Curran Associates, Red Hook, NY, 3955–3969.
Kobayashi, N., Farhadzadeh, A., Melby, J. A., Johnson, B. D., and Gravens, M. (2010). “Wave overtopping of levees and overwash of dunes.” J. Coastal Res., 26(5), 888–900.
Kobayashi, N., Gralher, C., and Do, K. (2013). “Effects of woody plants on dune erosion and overwash.” J. Waterway, Port, Coastal, Ocean Eng., 466–472.
Kobayashi, N., and Jung, H. (2012). “Beach erosion and recovery.” J. Waterway, Port, Coastal, Ocean Eng., 473–483.
Matsutomi, H., Yamaguchi, E., Naoe, K., and Harada, K. (2012). “Damage to reinforced concrete buildings and coastal trees due to the 2011 off the Pacific coast of Tohoku earthquake tsunami.” Proc., 33rd Conf. on Coastal Engineering, P. Lynett and J. M. Smith, eds., Vol. 2, Curran Associates, Red Hook, NY, 1848–1860.
Tørum, A. (1989). “Wave forces on pile in surface zone.” J. Waterway, Port, Coastal, Ocean Eng., 547–565.
Information & Authors
Information
Published In
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 13, 2013
Accepted: Apr 3, 2014
Published online: May 1, 2014
Published in print: Jan 1, 2015
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.