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Publications
Marta-Almeida, M., Cirano, M., Guedes Soares, C. and Lessa, G.C. (2017), “A numerical tidal stream energy assessment study for Baia de Todos os Santos, Brazil”, Renewable Energy, 2017, Vol. 107, pp. 271-287
The tidal potential density was assessed for the estuary Baa de Todos os Santos based on a high resolution numerical conguration. This study used the ocean model ROMS forced with realistic surface and lateral forcing, as well as with tides and river discharge into the bay. Strong currents were found along the main axis of the bay, particularly at the centre and left side of the bay main entrance, and for a considerable time fraction. In these regions, speeds higher than 1 m s..1 were found during about 30% of the time leading to a power density around 1300 W m..2 at the surface layer, reaching peaks higher than 2500 W m..2. The energetic ow at the left side of the inlet is aected by a remarkable sand ridge, the St. Antonio Bank which intensies the ow between the shoal and the coast.
Operation time versus tidal power (OTP) diagrams for the bay entrance show that even with a sharp reduction of operation time (50%) it is still possible to extract a high portion (95%) of the total power density available.
Using tidally ltered time series of speed and power density, three important oscillations were found: fortnight associated with M2+S2 spring-neap cycle; semiannual caused by the S2+K2 interference and responsible for about 1/4th of the total power density; and annual oscillation related with external forcings.
Besides the bay entrance, some regions inside the bay were identied as potentially interesting for tidal stream energy, but its study requires observations and also additional developments in the modelling conguration.
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