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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Optical plume velocimetry: a new flow measurement technique for use in seafloor hydrothermal systems
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Optical plume velocimetry: a new flow measurement technique for use in seafloor hydrothermal systems

机译：羽流测速法：一种用于海底热液系统的新流量测量技术

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摘要

Evidence suggests that fluid flow rates in mid-ocean ridge hydrothermal systems may be strongly influenced by mechanical forces such as ocean tidal loading. However, long time-series measurements of flow have not been collected in these environments. We develop a non-invasive method, called optical plume velocimetry (OPV), suitable for obtaining fluid flow rates through black smoker vents based on image analysis of effluent video. We use video from laboratory flows to evaluate three different methods for estimating the image-velocity field that are based on region-based matching, spectral-analysis of Hovmoller diagrams, and temporal cross-correlation of adjacent pixel values. We find that OPV is most sensitive and least biased when the cross-correlation method is used and conclude that OPV should not be applied to flows that are transitioning between jet-like and plume-like behavior.
机译：有证据表明，洋中脊热液系统中的流体流速可能会受到机械力（例如潮汐载荷）的强烈影响。但是，在这些环境中尚未收集流量的长时间序列测量结果。我们开发了一种非侵入性方法，称为光羽测速（OPV），适用于基于流出视频的图像分析获得通过黑烟口的流体流速。我们使用来自实验室流程的视频来评估三种不同的估计图像速度场的方法，这些方法基于基于区域的匹配，Hovmoller图的频谱分析以及相邻像素值的时间互相关。我们发现，使用互相关方法时，OPV最为灵敏且偏差最小，并得出结论，不应将OPV应用于在射流状和羽流状之间转换的流。

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