基于Bragg共振原理水面多重竖直板消浪性能实验研究

Experimental study on the attenuating waves performance of multiple vertical plates based on Bragg resonance

该文采用实验方法探索研究了表面波经过多重穿透水面的刚性薄板结构物传播时,透射波的波高变化。将多重穿透水面的刚性薄板竖直固定及等间距布置。基于Bragg共振条件,板间距与波长的一半相当。改变板浸入水面下的深度、板的数目和波陡,进行了实验研究。实验时采用浪高仪测量模型前后波形,整理出入射波幅和透射波幅,绘出透射系数tK随无因次波浪参数kh变化的曲线。结果显示,当水波波长接近板间距两倍左右时,出现透射系数较低的现象。

This paper experimentally studied the situations of transmission waves, while the surface water waves propagated through multiple rigid plates fixed vertically and penetrating the free surface. The space of the multiple rigid plates were constant in the scale of half of the wave length. The series experiments were carried out by changing the depth of the plates immerged in water, the number of the plates and the steepness of waves. The wave elevations were measured by wave gauges. Then the amplitudes of incident and transmission waves were sorted out, and the changes of the transmission coefficient K_t with dimensionless wave parameter kh were presented. The results show that there are low transmission coefficients when the wavelength is about twice the plate spacing.