河口底边界层湍流观测后处理技术方法分析

An integrated post-processing technique for turbulent flows in estuarine bottom boundary layer

河口底边界层过程是河口海岸研究与工程应用中的重要内容。三维点式高频流速仪(ADV)已经成为湍流现场观测的最有效的工具之一,然而受测量状态、复杂的波流环境、底床几何结构等因素的影响,湍流观测的后处理目前还不成熟。在前人工作的基础上,提出了河口底边界层湍流观测后处理的综合技术方法,包括测量状态判断、数据质量检测、坐标系旋转、去除毛刺及滤波,探讨了这些处理方法中的某些步骤及处理顺序对湍流参数估算可能产生的影响,提出了综合后处理技术的准确性评估方法。该研究对于近岸海洋湍流混合、泥沙输运等重要问题的解决可以提供较为扎实的技术支持。

The bottom boundary layer（BBL） flows are the important processes in estuarine and coastal dynamics and sediment transport.A high-frequency acoustic doppler velocimeter（ADV） has become the most effective tool in the BBL turbulence observations.Unfortunately,the filed observations are frequently interfered by the status of ADV-attached frame stability,and raw data is significantly contaminated by ambient waves and currents,bedforms and so on.To date,the post-processing procedure for turbulence parameters is far from being a standard method.On the basis of previous works,the paper proposed a comprehensive technical method for the post-processing,including status check,data quality control,coordinate rotation,despiking and filtering.Some potential errors arisen from these processing processes were analyzed in a greater detail,and the evaluation in accuracy of post-processing was discussed.The present contribution may provide a technical support for the ground-truth investigation of turbulent mixing and sediment transport in the coastal ocean.