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

Thiébaut, Maxime; Sentchev, Alexei; Bailly Du Bois, Pascal

Type de document :

Autre communication scientifique (congrès sans actes - poster - séminaire...): Communication dans un congrès avec actes

Titre :

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

Auteur(s) :

Thiébaut, Maxime [Auteur]
France Energies Marines [Brest]
Sentchev, Alexei [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bailly Du Bois, Pascal [Auteur]
Laboratoire de Radioécologie de Cherbourg-Octeville [IRSN/PSE-ENV/SRTE/LRC]

Titre de la manifestation scientifique :

3rd International Conference on Renewable Energies Offshore

Ville :

Lisbonne

Pays :

Espagne

Date de début de la manifestation scientifique :

2018-10-08

Date de publication :

2019

Discipline(s) HAL :

Planète et Univers [physics]

Résumé en anglais : [en]

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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL

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