“浪龙”波浪观测数据中潮位影响的消除方法

A method to remove tide effect for wave observation data by AWAC

"浪龙"是采用声学表面跟踪技术(AST)进行波浪观测的声学多普勒剖面流速仪,作业水深可达50 m,其采集的波高数据以各个时刻的绝对水深值表达,因此波高数据中包含了潮位的影响。文章采用线性拟合法消除了潮位对波高的影响,得到了真实的波高过程,并进一步采用自相关函数和傅里叶变换得到了波列的频谱,通过与Storm软件计算结果的比较,验证了该方法的正确性。

The AWAC is perhaps the most frequently used acoustic Doppler profiler and directional wave gauge. Using Acoustic Surface Tracking （AST）, the AWAC will make high quality wave measurements deployed up to 50 m below the surface. In the wave observation data, wave height is given as actual water depth at each time, which includes the tide effect. In this paper, a linear fitting method was given to remove the tide effect, and wave fre- quency spectrum was calculated by using auto-correlation function and Fourier transform method. The correctness of this method was verified by Storm software at last.