Summary of Wave Transmission Testing of the Martin Ecosystems BioHaven® Floating Breakwater Executive Summary Comprehensive physical modeling of the Martin Ecosystems BioHaven® Floating Breakwater (BFB), without vegetation, was performed in the University of South Alabama's wave basin research facility. The testing, analysis, and report development was lead by Dr. Bret M. Webb, Ph.D., P.E. with assistance from Dr. Jon D. Risinger, Ph.D. The purpose of the reduced scale modeling was to measure wave attenuation by the BFB and to report wave transmission coefficients for a range of wave and water level conditions across four unique experimental treatments. Treatments addressed deployment depth and BFB weight. Vegetative coverings were not considered. Experimental conditions consisted of six (6) water levels and eight (8) different waves. Each treatment consisted of forty-four (44) unique wave transmission experiments performed in replicates of three. The total number of unique experiments was 176, or 528 when accounting for replicates. These values do not reflect initial testing, without the structure in place, to establish baseline or background conditions. The BFB system was modeled at a reduced Froude scale of 1:4 (model:prototype). The scaled dimensions of the unit were 6.25 ft by 1.9 ft by 0.3 ft (length x width x height). The BFB was moored to the basin floor at all six connection points provided. Mooring cables were rigged in a diagonal fashion to provide lateral resistance to wave induced motion. A video taken during the experiment clearly shows the behavior of these moorings during testing. Measured wave transmission coefficients ranged from 0.44 to 0.99. Clear relationships between the transmission coefficient, structure size, wave characteristics, water levels, and deployment depths were evident. The wave attenuating capability of the BFB increases as the wavelength becomes small relative to the structure width. The wave attenuating capability of the BFB increases as the wave steepness increases. Finally, the wave attenuating capability of the BFB is maximized when the water depth is approximately 1.1 to 1.4 times larger than the deployment depth. A statistical analysis of the various treatment results indicate that there is no significant effect of BFB weight on wave transmission, but there is a significant effect relative to deployment depth (shallow vs. deep). Generally, wave transmission coefficients were lower for the shallower deployment and higher for the deeper deployment. Based on these results, there is no indication that vegetative growth will have a negative impact on the wave attenuating capability of the BFB. Performance of the BFB could be improved if the width were increased beyond the tested prototype value of 7.5 ft. The laboratory data clearly indicate that wave transmission will decrease as the structure size increases relative to the wavelength. Finally, performance of the BFB could be improved if the system were deployed at the Mean Tide Level (MTL) as compared to Mean High Water (MHW). By doing so, the amount of slack in the mooring system will be minimized during periods of low water and there will be less lateral translation of the BFB due to waves. Note: It is important to note that vegetation was not used in this study. The results are strictly wave attenuation of the matrix material alone. Vegetation will reduce wave heights quite a bit, for more information please contact us for a quote.