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The Alderney Race: general hydrodynamic and particular features
Pascal Bailly du Bois1, Franck Dumas2, Mehdi Morillon1
1Laboratoire de Radioécologie de Cherbourg, IRSN-LRC, Rue Max Pol Fouchet B.P. 10, 50130 Cherbourg en Cotentin, France.
Summary
The Alderney Race exhibits extreme tidal currents and unique hydrodynamic features. Research combines in situ measurements and modeling to understand these complex coastal dynamics for tidal energy applications.
Area of Science:
- * Coastal oceanography
- * Fluid dynamics
- * Tidal energy
Background:
- * The Alderney Race is characterized by significant tidal range and wave propagation.
- * Strong currents exceeding 5 m/s, counter currents, and gyres are prevalent.
- * Local variations in depth, seabed, and topography create diverse hydrodynamic regimes.
Purpose of the Study:
- * To provide an overview of the main hydrodynamic features of the Alderney Race strait.
- * To analyze unique phenomena such as mean sea level drops and resonance effects.
- * To contribute to understanding tidal dynamics and energy harvesting in the region.
Main Methods:
- * Utilized in situ measurements including sea levels and current profiles (Acoustic Doppler Current Profiler).
- * Employed two-dimensional hydrodynamic model simulations.
- * Incorporated data from surface radar currents, wave measurements, and tracer surveys.
Main Results:
- * Identified locations with a 0.4 m mean sea level drop linked to strong currents.
- * Observed resonance effects near the coast associated with offshore currents.
- * Documented the 'St Martin whistle' phenomenon with oscillating gyre centers and current reversals.
Conclusions:
- * The Alderney Race presents a complex and unique environment for coastal hydrodynamic studies.
- * Combining in situ data with models enhances understanding of hydrodynamic processes.
- * Findings offer insights applicable to other coastal areas and tidal energy harvesting.
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