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Floating breakwater design3/8/2024 ![]() Transaction of West-Japan Society of Naval Architecture. 3D Boundary Element Method Chapter – 5 Practical Hydrodynamics of Floating Bodies. Bulletin Research Institute for Applied Mechanics, Kyushu University Japan. Association Technique Maritime etAeronautique (ATMA), Paris, France. Water Motion in Moonpools Empirical and Theoretical Approach. on Ocean, Offshore and Arctic Engineering. of 22nd International Society of Offshore and Polar Engineers (ISOPE) Conference. Virginia: Coastal Engineering Research Center.ī. Floating Breakwaters: State of the Art Literature Review. Design and construction of mounds for breakwaters and coastal protection. Timber was a preferred material due to its large availability in the 1800s when floating breakwater concepts were first proposed, e.g. Conceptual Design of Rubble Mound Breakwaters. Floating breakwaters can be made of timber, plastic, reinforced or prestressed concrete, or steel. From the modifications and evaluations of the models, it could be realized that the moonpools inside the body could be used to obtain a more realistic model without reducing the optimum performance of the original model shape.  The accuracy of the computed results is confirmed with Haskind-Newman and energy conservation relations. The performance and characteristics of the modified models in terms of wave elevations on the free surface are evaluated at various wavelengths by using higher order boundary element method (HOBEM). In the present study, several modifications of the original 3D model are performed which include placing moonpools inside the body. Consequently, it is needed to modify the model to obtain a more realistic and efficient design without reducing significantly the high performance obtained previously. However, because the 3D model is formed by simply extruding the 2D shape in longitudinal direction, it only produces a model with uniform transversal shape which is considered to be less effective and efficient in terms of technical and economical points of view. Moreover, its performance and characteristics in 3D case were also evaluated in the subsequent study. The performance of the obtained model was verified with numerical relations as well as an experiment in towing tank. In an attempt to obtain a 2D floating breakwater model with high performance in wave reflection, genetic algorithm (GA) was combined with boundary element method (BEM) in the previous study. The suggested FB structure dimensions for wave attenuation in the IRL during living shoreline restoration are a draft of 0.4 m and a breadth of 1-1.25 m in a 0.6 m water depth.Naval Architecture Department, Engineering Faculty, Hasanuddin University, Makassar Indonesiaįloating breakwater, moonpools, higher order boundary element method (HOBEM), realistic model, transmission coefficient, wave elevation Abstract The numerically modeled predicted a lower transmission coefficient than the physical testing, due to assumptions during the computation and a uniform dampening coefficient throughout the dynamic cases. In the numeric modeling, the static FB structures attenuated the wave energies more effectively than the dynamic structures due to the lack of motion response. A wave-by-wave analysis was performed to determine the significant wave height, as well as a singular wave analysis that is comparable between each data set. The OpenFOAM solver, olaFoam, developed in 2015 by Pablo Higuera for wave generation and absorption, was applied to a numerical replicate of the FB structure in the FIT wave channel for ease of comparison and validation. The physical testing was performed in the Florida Institute of Technology (FIT) wave channel at 1:1 scale using a rectangular, wooden FB structure. ![]() Additionally, the FB motion response to wave interaction is simulated using a static structure and a dampened, dynamic structure. The dimension parameters were compared to the transmission coefficient, which is a nondimensional value traditionally used to compare the transmitted wave height to the incident wave height. The transmission coefficient is physically tested in a wave channel and numerically simulated in OpenFOAM for a rectangular FB structure to determine the effects of the draft parameter (dr/d) and the breadth parameter (B/L). FB structures attenuate wave energies and are transportable, allowing for removal once the living shoreline restoration is established. Based on previous studies, it has been found that habitat restoration will be successful if the wave height is reduced from 0.20 m to 0.10 m with the use of a FB structure. The design significant wave climate of the IRL in a 0.6 m water depth had an incident significant wave height of 0.20 m with a wave period of 1.6 s. This study examines the design and implementation of floating breakwaters (FB) in the Indian River Lagoon (IRL) to support and protect living shoreline restoration projects from damaging wave climates.
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