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MADE POSSIBLE THANKS TO INTERREG IVB NORTH-WEST EUROPE

Development of a current velocity mapping tool & analysis of local turbulence (FR)


The pictures above were taken during the partner visit of Ifremer on Nov 12, 2013.

Project Overview

The Laboratory of Oceanology and Geosciences/Université du Littoral – Cote d’Opale develops a current velocity mapping tool, analyzing measurements of tidal flow characteristics at different sites. This should provide much needed insights on current strength, direction, variability and turbulence.To measure velocity at different vertical levels, a rectangular floating platform with a velocity profiler and a gps system was made. This device is called ‘Towed Fish’ because it is towed by a boat. Not directly behind it though, but on the side, because the boat’s propeller causes too much turbulence.While the device is being towed, it makes a velocity profile (seabed to surface) every second. Because all is tracked by the gps system, the result of the measurements is a high resolution current map of a certain area.The development of the ‘Towed Fish’ is finished and the device is in its testing phase. The device was deployed in the Mediterranean in May and September and in Dover in July. The first results were quite successful.Due to bad weather, further tests are scheduled in the spring. Then the device can be extensively tested during full tidal cycles, measuring the change in tides and mapping current variability.

france

Analysis of local turbulence in relation with power production (FR)

Tidal turbines cause underwater turbulence, which has an effect on the seabed and its surroundings. That’s why the Laboratory of Oceanology and Geosciences/Université du Littoral – Cote d’Opale is developing the so called ‘Bottom Station’. This device should do all kinds of measurements on the seabed while a turbine is active. It should provide optical data, velocity profiles, sediment concentration data, turbulence…

And that’s not all. Due to the variable currents, power production can fluctuate heavily. That variability is mapped in time series. When those are combined with the measurements of the ‘Bottom Station’, the fluctuations can be explained.

Testing this device was scheduled in Dover in the spring of 2014.

 



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