A dual sensor device to estimate fluid flow velocity at diffuse hydrothermal vents |
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| Authors: | J Sarrazin P Rodier MK Tivey H Singh A Schultz PM Sarradin |
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| Institution: | aDépartement Etude des Ecosystèmes Profonds, Laboratoire Environnement Profond, Centre Ifremer de Brest, BP70, 29280 Plouzané, France;bWoods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA;cCollege of Oceanic and Atmospheric Sciences, Corvallis, Oregon 97331-5503, USA |
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| Abstract: | Numerous attempts have been made over the last thirty years to estimate fluid flow rates at hydrothermal vents, either at the exit of black smoker chimneys or within diffuse flow areas. In this study, we combine two methods to accurately estimate fluid flow velocities at diffuse flow areas. While the first method uses a hot film anemometer that performs high-frequency measurements, the second allows a relatively rapid assessment of fluid flow velocity through video imagery and provides in situ data to calibrate the sensor. Measurements of flow velocities on hydrothermal diffuse flow areas were obtained on the Mid-Atlantic Ridge (MAR). They range from 1.1 to 4.9 mm/s at the substratum level, in low-temperature (4.5–16.4 °C) diffuse flow areas from the Tour Eiffel sulfide edifice. A strong correlation was observed between fluid flow velocities and temperature, supporting the possible use of temperature as a proxy to estimate the flow rates in diffuse flow areas where such a simple linear flow/temperature relation is shown to dominate. |
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| Keywords: | Fluid flow velocity Hydrothermal vent Hot film anemometer Video imagery Diffuse flow |
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