Vahid Chegini - Ph.D. in Coastal Eng., Iranian National Center for Oceanography (INCO) Email address
Fateme Chegini - M.Sc. Student in Hydraulic Structure, University of Tehran
Mojgan RostamiNia - M.Sc. in Physical Oceanography, Islamic Azad University

The prediction of reflection and transmission coefficients through single perforated sheets plays an important role in the assessment of the hydraulic responses of screen breakwaters and upright perforated wave filters and absorbers and their efficient design. This paper reviews the result of laboratory tests in wave flumes to determine the reflection and transmission coefficients (Cr and Ct, respectively) through single perforated sheets. It has been shown that these coefficients can be calculated by using two new formulas which relate Cr and Ct to the wave-screen parameter. This parameter is the ratio of the product of discharge coefficient and the porosity of the sheet to the root square of wave steepness in deep water.