Establishment,validation and discussions of a three dimensional wave-induced current model |
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| Institution: | 1. Laboratory of Harbour Works, School of Civil Engineering, National Technical University of Athens, 5, Heroon Polytechniou Street, 15780, Zografos, Greece;2. Hellenic Centre for Marine Research, Institute of Oceanography, 46.7 km Athens-Sounion Ave., 19013, Anavyssos, Greece;1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2. Nanjing Center, China Geological Survey, 534 East Zhongshan Road, Nanjing, China;1. Department of Mathematics, University of Oslo, PO Box 1053 Blindern, NO-0316 Oslo, Norway;2. Department of Mathematical Sciences, NTNU, NO-7491 Trondheim, Norway;3. Signal Theory and Communications Department, Superior Polytechnic School, University of Alcalá, Alcalá de Henares, 28805 Madrid, Spain;1. Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal;2. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA, USA;3. Center for Mathematical Sciences, Universidade da Madeira, Portugal;4. IFREMER/DYNECO-PHYSED Centre Ifremer de Brest, Plouzané, France;5. MARE – Centro de Ciências do Mar e Ambiente, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal |
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| Abstract: | A three-dimensional numerical model was established to simulate the wave-induced currents. The depth-varying residual momentum, surface roller, wave horizontal and vertical turbulent mixing effects were incorporated as major driving forces. A surface roller evolution model considering the energy transfer, roller density and bottom slope dissipation was developed. The expression of the wave-induced horizontal turbulent mixing coefficient proposed by Larson and Kraus (1991) was extended to three-dimensional form. Plenty of experimental cases were used to validate the established model covering the wave setup, undertow, longshore currents and rip currents. Validation results showed the model could reasonably describe the main characteristics of different wave-induced current phenomena. The incorporation of surface roller for breaking waves should not be neglected in the modeling of surfzone hydrodynamics. The wave-induced turbulent mixing affects the structures of wave-induced current either in horizontal or in vertical directions. Sensitivity analysis of the major calibration parameters in the established model was made and their ranges were evaluated. |
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