Browse > Article
http://dx.doi.org/10.9765/KSCOE.2020.32.6.516

Stability Number of Additionally Placed Armor Unit (Tetrapod) Covered on Existing Two-Layered Tetrapod Rubble Mound Structures: Pattern Placing Condition  

Kim, Young-Taek (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
Lee, Jong-In (Department of Civil Engineering, Chonnam National University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.32, no.6, 2020 , pp. 516-523 More about this Journal
Abstract
Since the aging of coastal structures have been increased, the researches about the reinforcements of the existing aged structures are needed. Especially, the existing armor units placed on rubble mound structures should satisfy the stability against the increased design wave conditions. However the researches about these design problems have not been performed. In this study, the hydraulic model tests to investigate the stability number about the additionally placed armor unit were conducted. The main armor unit is a Tetrapod. The test results showed that the stability number (Kd) for additionally placed armor units(Tetrapod) increased up to maximum 10% comparing with that for 2 layers tetrapod (Kd = 8) within these test conditions with the pattern placing for existing armor layers and the stable armor layer slope for the non overtopping condition.
Keywords
rubble mound structure; armor unit; stability number; hydraulic model test; Tetrapod; additional placing;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Min, E.J., Cheon, S.H. and Suh, K.D. (2015). Comparison of stability coefficients of radial shape armor blocks depending on placement methods. Journal of Korean Society of Coastal and Ocean Engineers, 27(2), 135-141.   DOI
2 Suh, K.D. and Kang, J.S. (2012). Stability formula for tetrapods. Journal of Waterway, Port, Coastal, and Ocean Engineering, 138(3), 261-266.   DOI
3 Van der Meer, J.W. (1988). Stability of cubes, tetrapods and accropode. In: Design of breakwaters, Thomas Telford, London, 71-80.
4 Van der Meer, J.W. and Heydra, G. (1991). Rocking armour units: Number, location and impact velocity. Coastal Engineering, 15(1-2), 21-39.   DOI
5 Van Der Meer, J.W. (1999). Design of concrete armour layers. Proceedings of the Coastal Structures'99, Spain, 213-221.
6 CIRIA, CUR and CETMEF. (2007). The Rock Manual: The Use of Rock in Hydraulic Engineering, CIRIA Publication.
7 De Jong, W., Verhagen, H.J. and Olthof, J. (2004). Experimental research on the stability of armour and secondary layer in a single layered Tetrapod breakwater, Proceedings of the 29th international conferenceon Coastal Engineering, ICCE, Lisbon, 3520-3529.
8 Gurer, S., Cevik, E., Yuksel, Y. and Gunbak, A.R. (2005). Stability of Tetrapod breakwaters for different placing methods. Journal of Coastal Research, 21(3), 464-471.   DOI
9 Hudson, R.Y. (1959). Laboratory investigation of rubble-mound breakwaters. Journal of Waterways and Harbors Division, ASCE, 85(WW3), 93-121.   DOI
10 Hanzawa, M., Sato, H., Takahashi, S., Shimosako, K., Takayama, T. and Tanimoto, K. (1996) New stability formula for wave-dissipating con crete blocks covering horizontally composite breakwaters. 25th International Conference on Coastal Engineering, ASCE, 2, 1665-1678.
11 Medina, F.J.R., Molines, L.J. and Gomez, M. (2014). Influence of armour porosity on the hydraulic stability of cube armour layers. Ocean Engineering, 88, 289-297. doi:10.1016/j.oceaneng.2014.06.012.   DOI