规则波作用下植物概化模型消波实验研究

Experimental study on wave elimination of vegetation generalized model under regular wave action

开展植物消波研究具有工程意义。分别对植物根、茎和叶模型与不同工况下的规则波进行实验,并对实验段的沿程波高、波形参数、波浪频谱以及波能耗散规律进行分析。结果表明:波浪周期较大时,植物带前端和内部会出现不同程度的水位雍高现象,其非线性先增强后减弱,植被区波浪出现斯托克斯漂移现象。植被区内会产生相对于主频的二倍频波浪,但随着波浪穿过植被区,以二倍频波浪为代表的谐波逐渐消失,能量向主频波浪转移。分别得到了根、茎和叶的波能耗散系数的计算公式,可为采用植物护岸工程提供一定的参考依据。

It is of engineering significance to research on plant wave elimination. In present paper,the experiments on vegetation root, stem and leaf models and regular waves under different conditions were carried out, and then the wave height, wave parameters, wave spectrum and wave energy dissipation of the experimental section were analyzed. The results show that when the wave period is long, the high of water level increases in the front and the inside of the plant belt. And the nonlinearity is strengthened first and then weakened, and Storks drift occurs within regular waves travelling through the vegetation field. It is found that there also has been two-order harmonics induced by the vegetation, and then the two-order harmonics disappears as regular waves pass through the vegetation field, as a result, wave energy is transferred to the fundamental harmonics. The empirical formula for predicting wave energy loss are derived here, which can provide some references for adopting vegetation revetment project.