Assessing the impact of tidal stream energy extraction on the Lagrangian circulation

摘要: Whereas numerous numerical modelling have been conducted to gain further insights about the hydrodynamic characteristics of tidal stream energy sites, long-term transport water particles has routinely ignored. However, a refined evaluation circulation pathways is fundamental assess water-quality changes induced by converters. The present study investigates tide-induced Lagrangian in northwestern coastal waters Brittany (France, western Europe), including islands, shoals and straits with strong potential for turbine farm implementation. Particular attention dedicated impact power extraction from series horizontal-axis turbines. An original approach, based on coupling barycentric method predictions model high spatial resolution, considered single synoptic view. Spatial results reveal complex highly controlled bathymetry islands geometry. residual flow Fromveur Strait, separating Ushant island fromMoi ene archipelago, displays thus asymmetry, between prominent northeastern pathway currents up 0.45 m s −1 southward circulation. positions cyclonic anti-cyclonic recirculations, both upstream downstream are furthermore precisely defined. north eddy found closely located sand bank Four. impacts mainly along current emerging tendency surrounding eddies get closer site. displacements south recirculations may exceed 1.5 km possible implications evolution seabed features.