Overtopping wave reduction capability of Rakuna IV armor block used for Rubblemound Breakwater
Run up, overtopping are the main reasons that damage and unstabilize the coastal and basin protective structures. So, overtopping wave is an inevitable load during coastal structures designing process, particularly at present very complicated real situation of global sea level rise and climate change. Based on the early researches, allowable mean overtopping wave discharges play an important roll in determining breakwaters' dimension such as top elevation, slope protective alternatives in the port side and so on. The more permissible average overtopping wave discharges, the lower breakwater top elevation needed. Moreover, the weight of armor blocks used on a seaside slope can be reduced. However, the port side slope needs to be properly protected against the impact of overtopping wave. Thus, researching the application of new armored unit blocks with high overtopping wave reduction capability that is corresponsive to typhoon-generated wave conditions is totally in need. Rakuna IV is one of the newly developed wave-dissipating blocks invented by Nikken Kogaku (Japan) in 2007, and the stability of this block for rubble mound breakwaters has been investigated under non-wave overtopping conditions by many researchers in Japan, Korea, China, and Vietnam. To be more exhaustive in the design of breakwaters with this kind of block, this study carried out experimental research on wave overtopping performance of RAKUNA-IV (overtopping reduction by roughness factor γr) in wave flume at Ha Noi Water Resources University. Based on the physical model tests' results, the author has determined the overtopping wave reduction coefficient γr of Rakuna IV block and its relationship with Irribaren number xm-1,0.
EurOtop, 2018, Wave Overtopping of Sea Defences and Related Structures, Assessment Manual, Environment Agency UK/Expertise Netwerk Waterkeren NL/Kuratorium fur Forschung im Kusteningenieurswesen DE.
TAW, 2002, Technical report wave run-up and wave overtopping at dikes, Technical Advisory Committee on Flood Defence, The Netherlands.
Bruce, T., Van der Meer, J.W., Franco, L., Pearson, J.M., 2009. Overtopping performance of different armour units for rubble mound breakwaters, Coastal Engineering, 56, pp. 166-179
Le Thi Huong Giang 2015, " Wave Overtopping and stability under wave overtopping of RAKUNA IV for rubble mound breakwaters", Summary of doctoral dissertation
Burcharth, H.F., Christensen, M. Jensen, T., and Frigaard, P., 1999. Influence of core permeability on Accropode armor layer stability, Proceedings International conference coastlines, structures and breakwaters, Institution of Civil Engineers, Thomas Telford, London, pp. 34-45.
Tuan, T.Q., Masushita, H., Luong, N.Q., Hai, L.T, Hai, P.T and Taki, Y., 2011. Experimental study on the stability of Nikken Kogaku’s new wave-dissipating blocks in application to coastal protection works in Vietnam, Report of Joint Research WRU-NIKKEN KOGAKU, 137 pp.
TCVN (2015), Vietnamese standard on technical requirements of sea dike design.
Le Thi Huong Giang 2015, "The stability of RAKUNA-IV for Rubblemound Breakwater," Journal of Marine Science and Technology, P34-38.
Le Thi Huong Giang 2016, "Researching on the Overtopping Reduction Capacity of RAKUNA-IV for Rubblemound by numerical model IH2-VOF" , Journal of Transport Ministry.
Thieu Quang Tuan 2016, "The impact of the crown wall to overtopping wave discharges through sea dike," The annual Science Conference Proceedings, vol. ISBN, no. 978-604-82-006-4, pp. 147-150.
Thieu Quang Tuan 2017, "Book of Run up and Overtopping through sea dike."
Thieu Quang Tuan and et. al, Experimental study on stability of Nikken Kogaku’s new wave dissipating blocks in application to coastal protection works in Vietnam, 2012.
Vietnamese Government, 2018, Report "Chan may Breakwater Project.
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