基于新型三维辐射应力的近岸波流耦合模型

为了合理模拟近岸波流运动，基于考虑海底坡度影响的新型三维辐射应力公式，建立近岸三维波流耦合数学模型. 该模型引入2种波面水滚模式，考虑波浪附加水平紊动效应. 采用大量实测数据对所建模型进行验证. 结果表明，利用该模型可以较好地模拟近岸波浪传播以及增减水、沿岸流、底部离岸流、裂流等不同的近岸波生流现象. 该模型采用的波流耦合方式能够全面地反映近岸波流的相互作用，新型三维辐射应力公式较其他公式可以更准确地描述波生流的垂向结构. 对于不同的近岸流算例，获得更准确的模拟结果可能需要采用不同的水滚模式，说明更具普适性的水滚模型有待进一步的研究. 考虑波浪水平紊动会使模型计算出的流速平面分布更平滑，避免出现过于突兀的流场结果.

Nearshore coupled wave-current model based on new three-dimensional radiation stress formulation

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.