Optical plume velocimetry: a new flow measurement technique for use in seafloor hydrothermal systems

Publication Type  Journal Article
Year of Publication  2008
Authors  Crone, T. J.; McDuff, R. E.; Wilcock, W. S. D.
Journal Title  Experiments in Fluids
Volume  45
Issue  5
Pages  899-915
Journal Date  Nov
ISBN Number  0723-4864
Accession Number  ISI:000260065800010
Key Words  east pacific rise; de-fuca ridge; midocean ridge; turbulent jets; hot springs; juan; temperature; motion; fluids

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.


360OCTimes Cited:0Cited References Count:45

URL  <Go to ISI>://000260065800010
DOI  DOI 10.1007/s00348-008-0508-2