论文标题
通过粒子成像速度计对植被衰减的实验研究
Experimental study on wave attenuation by vegetation by means of particle imaging velocimetry
论文作者
论文摘要
沿海植被是一种生态防御，在面对海洋灾难（如风暴潮）时起着重要作用。在这项研究中，我们通过粒子成像速度法（PIV）对波浪衰减进行了实验研究，包括波高和波力衰减以及刚性植被内的流场。植被的阻力系数与植被的波衰减密切相关。基于Morison方程，在本研究中提出了一种新的改进的直接测量方法来得出植被的阻力系数。与先前的方法相比，该方法可以消除潜在误差并获得更准确的阻力系数，以与雷诺数的数字建立良好的关系。更重要的是，我们展示了流场，包括植被和湍流动能（TKE）磁场以不同波相中提交的瞬时速度，以描述波能耗散的机理。此外，通过植被的工作投入提出了一个重现瞬时TKE的预测模型。结果表明，所有参数的特征都可以帮助我们更好地了解沿海植被对波浪衰减的影响。
Coastal vegetation serves as an ecological defense and plays an important role when facing marine disaster such as storm surge. In this study, we investigated experimentally the wave attenuation, including wave height and wave force decay, and flow field within rigid vegetation by means of particle imaging velocimetry (PIV). Drag coefficient of vegetation is closely related the wave attenuation by vegetation. Based on Morison equation, a new modified direct measurement method to derive the drag coefficient of vegetation was proposed in this study. This method can eliminate the potential errors and obtain more accurate drag coefficient to have a well-fitted relationship with Reynolds number compared with the previous methods. More importantly, we showed the flow field including instantaneous velocity filed in different wave phase within the vegetation and turbulent kinetic energy (TKE) field to describe the mechanisms of wave energy dissipation. In addition, a prediction model to reproduce the instantaneous TKE was proposed by the work input of vegetation. The results illustrated that all these characteristics of parameters can help us understand the effect of the coastal vegetation on wave attenuation better.
