Comparison of the Impact of Akmon, Sta-bar, Sta-pod, Stock cube, and Tribar Armoring Layers on the Level of Flow Rate and Wave Overtopping

Document Type : Original Article


1 Master's student of Civil Engineering, Coastal, Ports and Marine Structures, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.

2 Associate professor of Department of Marine Structures Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran.



Breakwaters are structures whose main function is to reduce waves in an area and create a calm basin for the stopping, movement, and maneuvering of floating objects. Concrete armors can be constructed in different shapes, allowing for the creation of armors that have high engagement properties and an increased damage coefficient (KD), ultimately leading to a reduction in the weight of armor pieces and their ability to be deployed in steeper slopes on the breakwater body. Most coastal protection structures built in the country are of the traditional rubble and platform type, and the structures made with concrete armor are few and far between. In this study, the impact of Akmon, Sta-bar, Sta-pod, Stock cube, and Tribar armoring layers on the level of flow rate and wave overwash in coastal protection structures and which type of armor has the least overflow is investigated. First, the overall geometry of the breakwater and then the geometry of each armor layer is separately drawn using AutoCAD software and prepared for calling to the main model, the FLOW-3D 11.0.4 software. After modeling, the results are analyzed through the main model and Excel software. The lowest wave overwash in the breakwater occurs in the Akmon armor state, and the highest wave overwash in the breakwater occurs in the Stock Cube armor layer state. The least flow rate among breakwaters occurred in the Akmon armor state, and the highest flow rate among the five breakwaters also occurred in the Stock Cube armor state, which is approximately.


armor breakwater stability (case study: El Dikheila Port, Alexandria, Egypt). Ain Shams Engineering Journal, 5(3): 681-689.
Briganti, R. et al., 2022. Wave overtopping at near-vertical seawalls: Influence of foreshore evolution during storms. Ocean Engineering, 261: 112024.
Bruce, T., Van der Meer, J., Franco, L., Pearson, J.M., 2009. Overtopping performance of different armor units for rubble mound breakwaters. Coastal Engineering, 56(2): 166-179.
Dai, J., Wang, C.M., Utsunomiya, T., Duan, W., 2018. Review of recent research and developments on floating breakwaters. Ocean Engineering, 158: 132-151.
Elchahal, G., Lafon, P., Younes, R., 2009. Design optimization of floating breakwaters with an interdisciplinary fluid–solid structural problem. Canadian journal of civil engineering, 36(11): 1732-1743.
FLOW-3D, 2013. User Manual, version 11.0.3; Flow Science, Inc.: Santa Fe, NM, USA.
Gandomi, M.Ů., Solimani Babarsad, M., Pourmohammadi, M.H., Ghorbanizadeh Kharrazi, H., Derikvand, E., 2022. Simulation of Ogee Spillway by FLOW3D Software (Case Study: Shahid Abbaspour Dam). Journal of Hydraulic Structures, 8(3): 88-107.
Kim, Y.C., 2010. Handbook of coastal and ocean engineering. World Scientific.
McCartney, B.L., 1985. Floating breakwater design. Journal of Waterway, Port, Coastal, and Ocean Engineering, 111(2): 304-318.
Pepi, Y., Romano, A., Franco, L., 2022. Wave overtopping at rubble mound breakwaters: A new method to estimate roughness factor for rock armours under non-breaking waves. Coastal Engineering, 178: 104197.
Sumer, B.M., Fredsøe, J., 2000. Experimental study of 2D scour and its protection at a rubble-mound breakwater. Coastal Engineering, 40(1): 59-87.
Van der Meer, J.W., 1995. Conceptual design of rubble mound breakwaters, Advances In Coastal And Ocean Engineering: (Volume 1). World Scientific, pp. 221-315.