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Communication Dans Un Congrès Année : 2019

Monitoring tidal currents with a towed ADCP at tidal energy site in Alderney Race (Raz Blanchard)

Résumé

The tidal circulation in Alderney Race (Raz Blanchard) is assessed by using a towed Acoustic Doppler Current Profiler (ADCP) system and modelling. The study site is assumed to have the largest tidal stream potential in France. Optimal Interpolation (OI) was applied to process the underway velocity measurements. The interpolation technique allows reconstructing space-time evolution of the velocity field within the whole study domain for surveys whose duration is comparable or larger than the typical time of tidal variation (∼3–6 h). The method employs space-time velocity covariances derived from numerical simulations by a 2D hydrodynamic model MARS (Model for Applications on Regional Scale). Model covariances are utilized by the OI algorithm to obtain the most likely evolution of the velocity field under the constraints provided by the ADCP observations and their error statistics. All tests demonstrated significant (up to 50%) reduction of the model-data misfit as a result of space-time optimal interpolation. An improvement in representation of the temporal and spatial variability of the tidal stream was achieved. The resulting velocity fields were used for assessing the tidal power resource at site at fine scale. It is shown that OI of high resolution velocity measurements in Alderney Race makes the tidal steam potential estimation more accurate.
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Dates et versions

hal-02498994 , version 1 (04-03-2020)

Identifiants

  • HAL Id : hal-02498994 , version 1

Citer

Maxime Thiébaut, Alexei Sentchev, Pascal Bailly Du Bois. Monitoring tidal currents with a towed ADCP at tidal energy site in Alderney Race (Raz Blanchard). 3rd International Conference on Renewable Energies Offshore, Oct 2018, Lisbonne, Spain. pp.49-56. ⟨hal-02498994⟩
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