STABILITY OF RUBBLE MOUND BREAKWATERS AGAINST SOLITARY WAVES
AbstractNo formulas currently exist to design armour units against tsunami attack. To develop such formulae, laboratory experiments were carried out to clarify the failure mechanism of these types of structures. Also, the behavior of armour units against real cases of tsunami attack during the 2011 Tohoku tsunami were evaluated. Both the results of the laboratory experiments and the breakwaters studied in the field where then analyzed in terms of well established formulas such as that of Van der Meer or Hudson. The design of structures that only fail partially during a given tsunami event ("resilient† or "tenacious† structures) should be prioritized in future counter-measures, and in order to make it possible to construct such structures a modification of the Hudson formula for their design is proposed.
CERC. 1984 Shore Protection Manual. Co. Eng. Res. Center, U.S. Corps of Engineering, Vicksburg
Esteban, M., Takagi, H. and Shibayama, T. 2007. Improvement in Calculation of Resistance Force on Caisson Sliding due to Tilting. Coastal Engineering Journal (CEJ), Vol. 49, No.4 (2007) pp 417-441http://dx.doi.org/10.1142/S0578563407001678
Esteban, M., Nguyen Danh Thao, Takagi, H. and Shibayama, T. 2009. Pressure Exerted by a Solitary Wave on the Rubble Mound Foundation of an Armoured Caisson Breakwater, 19th (2009) International Offshore and Polar Engineering Conference, Osaka.
Esteban, M., Takagi, H. and Shibayama, T. 2012. Modified Goda Formula to Simulate Sliding of Composite Caisson Breakwater, Coastal Engineering Journal, (under review)http://dx.doi.org/10.1142/S0578563412500222
Esteban M., Nguyen Danh Thao, Takagi H. and Shibayama T. 2008. Laboratory Experiments on the Sliding Failure of a Caisson Breakwater Subjected to Solitary Wave Attack. PACOMS-ISOPE Conference, Bangkok, Thailand.
Hudson, R.Y. 1959. Laboratory Investigation of Rubble-Mound Breakwaters, J. Waterways, Harbors Div., 85, ASCE, pp93-121.
Ikeno, M., Mori, N. and Tanaka, H. 2001. Experimental Study on Tsunami force and Impulsive Force by a Drifter under Breaking Bore like Tsunamis, Proceedings of Coastal Engineering, JSCE, Vol. 48, pp. 846-850.http://dx.doi.org/10.2208/proce1989.48.846
Ikeno, M. and Tanaka, H. 2003. Experimental Study on Impulse Force of Drift Body and Tsunami Running up to Land, Proceedings of Coastal Engineering, JSCE, Vol. 50, pp. 721-725.http://dx.doi.org/10.2208/proce1989.50.721
Kato, F., Suwa, Y., Watanabe, K., Hatogai, S. 2012. Mechanism of Coastal Dike Failure Induced by the Great East Japan Earthquake Tsunami. Proc. of 32nd Int. Conf. on Coastal Engineering (ICCE 2012) Santander, Spain.
Mikami, T., Shibayama, T., Esteban, M. and Matsumaru, R. 2012. Field Survey of the 2011 Tohoku Earthquake and Tsunami in Miyagi and Fukushima Prefectures, Coastal Engineering Journal (CEJ), Vol. 54, No. 1http://dx.doi.org/10.1142/S0578563412500118
Mizutani, S. and Imamura, F. 2000. Hydraulic Experimental Study on Wave Force of a Bore Acting on a Structure, Proceedings of Coastal Engineering, JSCE, Vol. 47, pp. 946-950.http://dx.doi.org/10.2208/proce1989.47.946
Mori, N., Takahashi T. and The 2011 Tohoku Earthquake Tsunami Joint Survey Group. 2012 Nationwide survey of the 2011 Tohoku earthquake tsunami, Coastal Engineering Journal, Vol.54, Issue 1, pp.1-27.
Sakakiyama, T. 2012. Stability of Armour Units of Rubble Mound Breakwater Against Tsunamis. Proc. of 32nd Int. Conf. on Coastal Engineering (ICCE 2012) Santander, Spain. Tanimoto, L., Tsuruya, K., and Nakano, S. 1984. Tsunami Force of Nihonkai-Chubu Earthquake in 1983 and Cause of Revetment Damage, Proceeding of the 31st Japanese Conference on Coastal Engineering, JSCE.
Van der Meer, J. W. 1987. Stability of Breakwater Armour Layers. Coastal Engineering, Vol 11, p. 219-239.http://dx.doi.org/10.1016/0378-3839(87)90013-5