Heterogeneous Packing and Hydraulic Stability of Cube and Cubipod Armor Units
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 140, Issue 1
Abstract
This paper describes the heterogeneous packing (HEP) failure mode of breakwater armor. HEP reduces packing density in the armor layer near and above the mean water level and increases packing density below it. With HEP, armor units may move in the armor layer, although they are not actually extracted from it. Thus, when HEP occurs, armor-layer porosity is not constant, and measurements obtained with conventional methods may underestimate armor damage. In this paper, the Virtual Net method is proposed to calculate armor damage considering both armor-unit extraction and HEP. The Cubipod concrete armor unit is then described as a solution to the effects of HEP on conventional cubic block armor. The hydraulic stability of cube and Cubipod armor units was compared in two-dimensional laboratory experiments. Cube and Cubipod armor layers were tested in two wave flumes under nonbreaking and non-overtopping conditions. The hydraulic stability was higher for double-layer Cubipod armor than for single-layer Cubipod armor, which had a higher hydraulic stability than conventional double-layer cube armor.
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Acknowledgments
The authors are grateful for the financial support of CDTI (CUBIPOD Project), SATO Construction Co. (OHL Group), and Puertos del Estado (Convenio de Diques). The authors also thank Debra Westall for revising the manuscript.
References
Broderick, L. L. (1983). “Riprap stability, a progress report.” Proc., Coastal Structures ‘83, ASCE, West Conshohocken, PA, 320–330.
Bruun, P. (1978). “Common reasons for damage or breakdown of mound breakwaters.” Coast. Eng., 2, 261–273.
Burcharth, H. F. (1993). “The design of breakwaters.” Rep. of the Dept. of Civil Engineering, Aalborg Univ., Aalborg, Denmark.
CIRIA/CUR/CETMEF. (2007). The rock manual. The use of rock in hydraulic engineering, 2nd Ed., C683, CIRIA, London.
Figueres, M., and Medina, J. R. (2004). “Estimation of incident and reflected waves using a fully non-linear wave model.” Proc., 29th Int. Conf. on Coastal Engineering, World Scientific, Singapore, 594–603.
Gómez-Martín, M. E., and Medina, J. R. (2006). “Damage progression on cube armored breakwaters.” Proc., 30th Int. Conf. on Coastal Engineering, World Scientific, Singapore, 5229–5240.
Gómez-Martín, M. E., and Medina, J. R. (2007). “Cubipod concrete armor unit and heterogeneous packing.” Proc., 5th Coastal Structures Int. Conf., World Scientific, Singapore, 140–151.
Gómez-Martín, M. E., and Medina, J. R. (2008). “Erosion of cube and Cubipod armor layers under wave attack.” Proc., 31st Int. Conf. on Coastal Engineering, World Scientific, Singapore, 3461–3473.
Hudson, R. Y. (1959). “Laboratory investigation of rubble-mound breakwaters.” J. Wtrwy. and Harb. Div., 85(3), 93–122.
Lomónaco, P., Vidal, C., Medina, J. R., and Gómez-Martín, M. E. (2009). “Evolution of damage on roundheads protected with Cube and Cubipod armour units.” Proc., Coasts, Marine Structures and Breakwaters 2009, Institution of Civil Engineers (ICE), Vol. 1, Thomas Telford, London, 169–180.
Losada, M. A., Desire, J. M., and Alejo, L. M. (1986). “Stability of blocks as breakwater armor units.” J. Struct. Eng., 112(11), 2392–2401.
Medina, J. R., et al. (2011). “Prototype drop tests of cube and cubipod armor units.” J. Waterway, Port, Coastal, and Ocean Eng., 137(2), 54–63.
Medina, J. R., and Gómez-Martín, M. E. (2012). “ and safety factors of concrete armor units.” Coastal Proceedings, 33(1), structures.29.
Medina, J. R., Gómez-Martín, M. E., and Corredor, A. (2010). “Influence of armor unit placement on armor porosity and hydraulic stability.” Coastal Proceedings, 32(1), structures.41.
Medina, J. R., Hudspeth, R. T., and Fassardi, C. (1994). “Breakwater armor damage due to wave groups.” J. Waterway, Port, Coastal, and Ocean Eng., 120(2), 179–198.
Mol, A., Ligteringen, H., Groenevelend, R. L., and Pita, C. R. A. M. (1983). “West Breakwater-Sines study of armour stability.” Proc., Coastal Structures ’83, ASCE, Reston, VA, 57–70.
Muttray, M., Reedijk, J. S., Vos-Rovers, I., and Bakker, P. (2005). “Placement and structural strength of Xbloc and other single layer armor units.” Proc., Coastlines, Structures and Breakwaters 2005, Institution of Civil Engineers (ICE), Thomas Telford, London, 556–567.
U.S. Army COE (USACE). (1984). Shore protection manual, U.S. Army Engineer Waterways Experiment Station, Coastal and Hydraulics Laboratory, Vicksburg, MS.
U.S. Army COE (USACE). (2006). “Coastal engineering manual.” Engineering manual No. 1110-2-1100, Washington, DC.
Van der Meer, J. W. (1988a). “Deterministic and probabilistic design of breakwater armor layers.” J. Waterway, Port, Coastal, and Ocean Eng., 114(1), 66–80.
Van der Meer, J. W. (1988b). “Stability of cubes, tetrapodes and accropodes.” Proc., Coasts, Marine Structures and Breakwaters 1988, Institution of Civil Engineers (ICE), Thomas Telford, London, 71–80.
Vidal, C., Losada, M. A., and Mansard, E. P. D. (1991). “Stability of mound breakwater’s head and trunk.” J. Waterway, Port, Coastal, and Ocean Eng., 117(6), 570–587.
Vidal, C., Martin, F. L., Negro, V., Gironella, X., Madrigal, B., and García-Palacios, J. (2003). “Measurement of armor damage on rubble mound structures: Comparison between different methodologies.” Proc., 4th Coastal Structures Int. Conf., World Scientific, Singapore, 189–200.
Vidal, C., Medina, R., and Lomónaco, P. (2006). “Wave height parameter for damage description of rubble-mound breakwaters.” Coast. Eng., 53(9), 711–722.
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© 2014 American Society of Civil Engineers.
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Received: Nov 28, 2012
Accepted: Jul 10, 2013
Published online: Jul 12, 2013
Published in print: Jan 1, 2014
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