Abstract An apparent increase in the frequency and intensity of natural disturbances and anthropogenic activities accelerates the global degradation of coral reefs. The emergency planning for coastal erosion and flooding along the low-lying coasts fronted by coral reefs underscores the need to predict and evaluate reasonably the hydrodynamic consequences of reef degradation. Here the ability of the well validated Smoothed Particle Hydrodynamics (SPH) porous model is enhanced by integrating a momentum source wave maker for wave groups generation in water of arbitrary depth. Validated results show the SPH model can predict properly the propagation and transformation of wave groups over the complex coral reef. The model is finally adopted to predict the hydrodynamic consequences induced by reef degradation both under the reef resonance and off-resonance conditions. This work provides a general framework for understanding the effects of reef degradation on the spatial distributions of wave setup, wave-induced current and low frequency wave energy over the reef-flat under the action of bichromatic wave groups with different frequency differences.

中文翻译：

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SPH 评估珊瑚礁退化引起的水动力后果

摘要 自然干扰和人为活动的频率和强度的明显增加加速了全球珊瑚礁的退化。珊瑚礁前低洼海岸沿岸侵蚀和洪水的应急规划强调需要合理预测和评估珊瑚礁退化的水动力后果。在这里，通过集成动量源造波器在任意深度的水中生成波群，增强了经过充分验证的平滑粒子流体动力学 (SPH) 多孔模型的能力。验证结果表明 SPH 模型可以正确预测波群在复杂珊瑚礁上的传播和转换。最后采用该模型来预测珊瑚礁共振和非共振条件下珊瑚礁退化引起的水动力后果。这项工作为理解在不同频率差异的双色波群的作用下珊瑚礁退化对珊瑚礁滩上波浪设置、波浪感应电流和低频波能量的空间分布的影响提供了一个总体框架。