No abstract

This paper presents the result of hydraulic model experiments on the coefficients of wave transmission over a low -crown-height type artificial reef which is made of wave dissipating concrete blocks . The ratio between the depth from water surface to the top of the submerged reef and the incident wave height, R/HI, varies from0.79 to 8.75. The relative width of the reef against wave length, B/L has a variation from 0.51 to 2.53. The wave-breaking limit,R/HI, lies between 0.8 and 1.3 for the above structure. The transmission coefficient, KT, decreases following an increase in B/L.The change of KT is small for a range of B/L larger than 1.6. With regard to the relationship between the ratio of wave height over block scale, HI/d', and KT, KT decreases slightly parallel with increase in HI/d', being proportional to increase in B/L. There is no significant relationship identified between Reynolds number, Re, and KT. Based on the above results, an empirical formula to assess KT is proposed, employing B/L as a parameter.