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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 an important parameter in physics. The relaxation rate of surface waves reflects the time it takes for the perturbed action spectrum to return to its steady state, which is difficult to calculate directly due to various oceanographic and meteorological parameters. The traditional study of relaxation rate mainly uses the devices such as wave height meter, wind pressure gauge, radar and so on to carry on the data actual measurement or the parameter fitting according to the experience value. This paper presents a method based on the line array CCD relaxation rate measurement. Compared with the traditional method of measuring the relaxation rate, it can work stably in different storms and obtain the information of surface wave and surface weak flow simultaneously. Using the method presented in this paper, the relaxation rate of SAW at different wind speeds was measured by a sink test. The experimental results are in good agreement with the classical model, which verifies the effectiveness of the proposed method. This method can be used to measure the surface wave modulation in the wave-current interaction theory.