Performance of solid and perforated U-type breakwaters under regular and irregular waves |
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| Authors: | K Günayd&#x;n M S Kabda
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| Institution: | 1. Department of Mathematics, Jadavpur University, Kolkata-700032, India;2. Department of Mathematics, Diamond Harbour Women’s University, South 24 Parganas-743368, India;1. School of Civil and Environmental Engineering, Cornell University, USA;2. Institute of Oceanic and Hydrological Sciences, National Central University, Taiwan;3. Department of Civil and Environmental Engineering, MIT, USA;4. Instituto de Hidraulica Ambiental, Universidad de Cantabria, Spain;5. O.H. Hinsdale Wave Research Laboratory, Oregon State University, USA;1. Iranian National Institute for Oceanography and Atmospheric Sciences (INIOAS), Tehran 1411813389, Iran;2. School of Civil Engineering, College of Engineering, University of Tehran, Tehran 4563-11155, Iran;3. Coastal modeling expert at Department of Coastal and Ports Engineering, MSc in Marine Structures Engineering, Ports and Maritime Organization, Tehran, Iran |
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| Abstract: | An experimental investigation of U-type breakwaters was carried out in a laboratory channel. Both regular and irregular waves were used during testing. Two types of breakwaters such as solid and perforated were studied to analyse the porosity effect of structures. In order to investigate performance of these breakwaters for different immersion depths, four depths of immersions of the solid and perforated breakwaters were selected. Different wave groups were generated over these breakwaters, and the transmission, reflection and energy dissipation characteristics of each breakwater were determined. Three coefficients such as transmission, reflection and energy dissipation coefficients, which were named as Ct, Cr, and Cl, respectively, were used during the evaluation of the test results. The most important parameters governing performance of these breakwaters were determined by using earlier investigations and experimental results. These parameters were expressed as a dimensionless group by using π theory. Based on the test results, empirical expressions were formulated to describe the Ct, Cr, and Cl for different immersion depths of solid and perforated breakwaters under regular and irregular waves. |
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| Keywords: | U-type breakwater Wave transmission Wave reflection Energy loss Regular wave Irregular wave Experiment Flume |
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