Marine Energy Resources in the North Atlantic Yann-Hervé De Roeck.

Marine Energy Resources in the North AtlanticYann-Hervé De Roeck

Renewable energies on EarthAnnual balance, facts and figures

All yearly figures

l3 – IRENA Conference

Source: IAE-OES, http://www.ocean-energy-systems.org/ocean-energy-in-the-world/gis-map/

Non strictly resource related thresholdsBathymetry, population and EEZ

l4 – IRENA Conference

Hurricane Ivan track Source: NOAA

Wind climatology Source: Nasa

Winds over the North AtlanticSteady resource and extreme weather events

Radar image for wind EnviSat compared to meteorological model Arome (Météo-France)Average accuracy with respect to in situ measurement : 1.5 m/s and 20°,3% error in Weibull wind statistical parameters . Pixel: 950m x 950m. 400 km swath

Wind resource assessmentRemote sensing versus model hindcast

l6 – IRENA Conference

Source : Gunn & Stock-Williams (2012)

Source : previmer project,www.previmer.org

Waves over the North AtlanticAs for wind resource, better statistics at the 40-50 latitudes

Big statistical difference between leeward and windward coastsSource: PREVIMER

SAR image of the Iroise Sea (Cosmo SkyMed)

Ushent island offshore Brittany

Wave resource assessmentRemote sensing from synthetic aperture radar

Average accuracy with respect to in situ measurement : significative height: 30 cm,wavelength: 36 m, direction : 17°Pixel: 20km x 20km. 400 km swath

l8 – IRENA Conference

Tidal currents, mean velocitySource: Noveltis, http://tips.noveltis.com/

Ocean currents, mean velocitySource: RSMAS, Miami.

Currents over the North AtlanticTidal resource for the near future, ocean resource for midterm development

PassageKaki

Hao atollTuamotu archipelago

~50 km

Source: ‘Etude des courants de la passe « Kaki » de l’atoll de HaoEvaluation du gisement hydrolien’Ifremer - Auteurs : Damien MARIGLIANO, Marc TAQUET

2011 Ifremer study and monitoring:combined effects of tidesand waves coming from offshorebreaking on the coral reef

Current through passage (45%) > 1.5 m/scan reach 4 m/s

Potential :some tens of MWh/year

Possible exploitation :- main passage- hoas currents

Combined tidal and wave energy: the atoll caseTidal beating modulated by the outward current due to the drain of overtopping waves

l10 – IRENA Conference

TTemperature difference between 20 and 1000m Source: Rajagopalan & Nihous (2012)

Ocean Thermal Energy Conversion resourceThe revenge of the 20-20 latitudes

Needs for large sets of Environmental DataEfficiency and impact

1- Estimate and plan the MRE resourcea- LCOE depends on a 2 digit load

factor2- Design and size technologies

a- Energy conversion optimisationb- Sea state thresholds for

commissioning

3- Monitoring during exploitationa- Security / safeguardb- Optimal control for

productionc- Impact assessment

30 m

WERPO wave project for Grenada island

Openhydro-DCNS project for Bréhat, Alderney islands