Researchers in the UCD School of Mathematical Sciences, in collaboration with Met Éireann, have created a new wind and wave atlas for Ireland for the period 2000-2012. The study was supported by the Sustainable Energy Authority of Ireland (SEAI) through the Renewable Energy Research Development & Demonstration Programme.
Ireland is uniquely placed in terms of its ocean renewable energy resource, with a highly energetic wave and wind climate. The western coast of Ireland possesses one of the best wave energy resources in the world and consequently, is a promising location for the future deployment of wave energy converters.
Quantifying the wave climate and energy resource can aid in the selection of adequate locations for potential deployment and for the planning and design of those marine operations. In addition, up-to-date knowledge of the wind and wave climate of Ireland is very desirable for all marine activities.
Key results:
Wind atlas
The wind atlas was derived by downscaling the ERA-Interim atmospheric re-analysis to a 2.5km horizontal resolution with 65 vertical levels using the mesoscale HARMONIE model, a well-established atmospheric model used by Met Éireann for operational forecasting. Downscaling describes the process of deriving finer resolution data from coarser resolution model data. This allows local conditions to be simulated in greater detail. The downscaling area covers all of Ireland and its coastal waters ensuring that physically consistent wind fields are generated for both land and sea areas.
Wave atlas
The wave climate was estimated using the WAVEWATCH III wave model. The resolution of the wave model varied from approximately 10km offshore to a maximum resolution of 250m in the nearshore. In order to provide a realistic description of the nearshore waves, the wave model was driven by the HARMONIE downscaled winds at 10m height, which have sufficient resolution to reflect the small scale orographic features associated with the coastlines and the sheltering effects of bays and islands.
The wave hindcast was also forced at the model grid boundaries by wave directional spectra from the ERA-Interim wave re-analysis. This ensured that realistic ocean swells entered the model domain from the North Atlantic.
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Press release; Image: Met Éireann