1. Key Laboratory of Engineering Sediment, Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456, China 2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China 3. CCCC First Harbor Consultants Limited Company, Tianjin 300222, China
A three-dimensional coupled wave-current model was established based on a new three-dimensional radiation stress formulation including the beach slope effects in order to reasonably simulate the nearshore waves and circulations. Two kinds of surface roller models were implemented, and the wave-induced horizontal turbulent mixing effects were included in the coupled model. A number of experimental cases were used to validate the established model. The validation results show that the model can accurately simulate the nearshore wave propagation and various wave-induced circulation phenomena, including the wave setup, longshore current, undertow and rip current. The present wave-current coupling system can comprehensively describe the nearshore wave-current interaction, and the new three-dimensional radiation stress formulation used in the model can provide better performances than the other formulations for vertical flow structure simulations. The different surface roller models were used to obtain more accurate simulation results for different nearshore circulation cases, indicating that a more generally appropriate surface roller model requires further investigation. The wave-induced horizontal turbulent mixing can make the flow field smoother and avoid a too sharp velocity distribution.
Chao JI,Qing-he ZHANG,Dian-guang MA,Yue-feng WU,Qi JIANG. Nearshore coupled wave-current model based on new three-dimensional radiation stress formulation. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 128-136.
Fig.1Information exchange between model components
Fig.2Validation of wave height, wave setup and setdown, and longshore current for experiment with oblique wave incidence
Fig.3Validation of wave height, wave setup and setdown, and undertow for experiment with normal wave incidence
Fig.4Validation of wave height for DUCK94 experiment
Fig.5Validation of vertical profiles of wave-induced nearshore circulation for DUCK94 experiment
Fig.6Wave and flow fields from model simulations for rip current case
Fig.7Validation of normalized cross-shore velocities in different cross-shore transects for rip current case
Fig.8Simulated wave fields by only wave model and coupled model for test T of rip experiment
Fig.9Comparison of simulated wave height distributions in cross-shore transect located at y = 8.5 m by only wave model and coupled model with measured data for test T of rip experiment
Fig.10Comparison of undertow from model simulations using different radiation stress formulations with measured data
Fig.11Comparison of normalized cross-shore velocities from model simulations using different radiation stress formulations with measured data for rip current case
Fig.12Comparison of wave setup and setdown, and longshore current from model simulations using different surface roller models with measured data
Fig.13Comparison of undertow from model simulations using different surface roller models with measured data
Fig.14Effects of wave-induced horizontal turbulent mixing on longshore current distributions
Fig.15Effects of wave-induced horizontal turbulent mixing on rip current distributions
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