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
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摘要: 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。Abstract: 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.
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Key words:
- ADV /
- data post-processing /
- bottom boundary layer /
- turbulence /
- the Zhujiang(Pearl) River estuary
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NIELSEN P.Coastal Bottom Boundary Layers and Sediment Transport[M].Singapore: World Scientific, 1992. WRIGHT L D.Benthic boundary layers of estuarine and coastal environments[J].Reviews in Aquatic Sciences, 1989, 1(1): 75-94. DORON P, BERTUCCIOLI L, KATZ J, et al.Turbulence characteristic and dissipation estimates in the coastal ocean bottom boundary layer from PIV data[J].Journal of Physical Oceanography, 2001, 31(8): 2108-2134. KIM S C, FRIEDRICHS C T, MAA J P-Y, et al.Estimating bottom stress in tidal boundary layer from acoustic doppler velocimeter data[J].Journal of Hydraulic Engineering, 2000, 126: 399-406. NIKORA V I, GORING D G.ADV measurements of turbulence: Can we improve their interpretation?[J].Journal of Hydraulic Engineering, 1998, 124(60): 630-634. MOHRHOLZ V, PRANDLE H, LASS H U.Estimation of the dissipation rates in dense bottom plumes using a pulse coherent acoustic doppler profiler (PC-ADP)-Structure function approach[J].Journal of Marine Systems, 2007, 70: 217-239. CACCHIONE D A, STERNBERG R W, OGSTON A S.Bottom instrumented tripods: History, applications, and impacts[J].Continental Shelf Research, 2006, 16:402-407. NOTERK.Vector current meter user manual[M].Norway: Nortek AS, Vangkroken 2,2005. FUGATE D C, FRIEDRICHS C T.Determining concentration and fall velocity of estuarine particle populations using ADV, OBS and LISST[J].Continental Shelf Research, 2002, 22:1867-1886. GORING D G, NIKORA V I.Despiking acoustic doppler velocimeter data[J].Journal of Hydraulic Engineering, 2002, 128(1): 117-126. TROWBRIDGE J H, ELGAR S.Turbulence measurements in the surf zone[J].Journal of Physical Oceanography, 2001, 31: 2403-2417. MORI N, SUZUKI T, KABUNO S.Noise of acoustic Doppler velocimeter data in bubbly flows[J].Journal of Engineering Mechanics, 2007, 133: 122-125. CHANSON H, TREVETHAN M, AOKI S.Acoustic doppler velocimetry(ADV) in small estuary: Field experience and signal post-processing[J].Flow Measurement and Instrumentation, 2008, 19: 307-313. PARSHEH M, SOTIROPOULOS F, PORTE-AGEL F.Estimation of power spectra of acoustic-doppler velocimetry data contaminated with intermittent spikes[J].Journal of Hydraulic Engineering, 2010, 136(6): 368-378. VOULGARIS G, TROWBRIDGE J H.Evaluation of the acoustic doppler velocimeter (ADV) for turbulence measurements[J].Journal of Atmospheric and Oceanic Technology, 1998, 15(1): 272-289. WAHL T L.Discussion of despiking acoustic doppler velocimeter data[J].Journal of Hydraulic Engineering, 2003, 129(6): 484-487. LHERMITTE R, LEMMIN U.Open-channel flow and turbulence measurement by high-resolution doppler sonar[J].Journal of Atmospheric and Oceanic Technology, 1994, 11: 1295-1308. CEA L, PUERTAS J, PENA L.Velocity measurements on highly turbulent free surface flow using ADV[J].Experiments in Fluids, 2007, 42: 333-348. 刘志宇, 魏皓.黄海潮流底边界层内湍动能耗散率与底应力的估计[J].自然科学进展, 2007, 17(3): 362-369. 刘欢, 吴超羽.河口湍流数据现场采集和后处理[J].海洋工程, 2011, 29(2):122-128. WU C Y, WU J X.Small scale dynamic structures and their sedimentation effects in estuarine environments[M]//ARCILLA A S, STIVE M J F, KRAUS N C.Coastal Dynamic’94.ASCE, New York, 1994. LIU H, WU C Y, XU W M, et al.Contrasts between estuarine and river systems in near-bed turbulent flows in the Zhujiang (Pearl River) Estuary, China[J].Estuarine, Coastal and Shelf Science, 2009, 83: 591-601. 苏金明, 张莲花, 刘波.MATLAB工具箱应用[M].北京, 电子工业出版社, 2004. IORIO D D, KANG K R.Variations of turbulent flow with river discharge in the Altamaha River Estuary, Georgia[J].Journal of Geophysical Research, 2007, 112, C05016, doi: 10.1029/2006JC003763. WU J X, LIU H, REN J, et al.Cyclonic spirals in tidally accelerating bottom boundary layers in the Zhujiang (Pearl River) Estuary[J].Journal of Physical Oceanography, 2010, 41(6): 1209-1227. GROSS T F, NOWELL A R M. Mean flow and turbulence scaling in a tidal boundary layer[J]. Cont. Shelf Res, 1983, 2(2/3): 109-126.
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