基于线阵CCD的水面波松弛率测量方法（英文）

Measuring method of water surface wave relaxation rate based on linear array CCD

松弛率是物理学中的一个重要参数。水面波的松弛率反映了其受扰动后的作用谱恢复到稳态所需的时间长短,因其受到多种海洋学和气象学参数影响很难直接计算。传统的松弛率研究主要是利用波高仪、风压力计、雷达等设备进行数据实测或根据经验值进行参数拟合。文章提出了一种基于线阵CCD的松弛率测量方法。和传统测量松弛率的方法相比,可以稳定工作在不同风浪环境下,并能够同步获得水面波和表面弱流场信息。利用本文所提方法,通过水槽实验对不同风速下的表面波松弛率进行了测量。实验结果与经典模型比较吻合,验证了所提出的方法的有效性。该方法可用于测量风浪环境下波流相互作用理论中表面波受调制情况。

Relaxation rate is a very crucial parameter in physics.For the water surface wave,its relaxation rate is directly relevantto the response time of disturbed spectrum returning back to its quasi-steady state.It is difficult to be calculated directly asa function of different oceanographic and meteorological parameters.Previous researches were mainly based on experimentalmeasurements or parameterization.In this paper,a method based on the liner array charge-coupled device(CCD)is proposed tomeasure the relaxation rate of the water surface wave.Compared with the traditional methods?it can obtain the information ofsurface wave and current synchronously,and works well under a multi wind-wave environment.Wind wav^tank experimentswere carried out based on this method.The good consistency between the results calculated by this method and the traditionalrelaxation rate models shows the validity of the proposed method.This method can be further used to study the modulation theoryof surface waves by currents.