Wind driven energy flows as a micro-renewable resource

Electronic versions

Documents

  • Michael Kennington

    Research areas

  • Wind driven surface currents, Renewable micro energy resource

Abstract

Buoy observation platforms require energy. Modern advances in equipment power efficiency and advances such as the Self-Contained Ocean Observation Payload systems collecting real time data at sea means lower operating power demand. Currently the primary battery charging system is based on solar energy. At high latitudes during the winter months no charging occurs. The application of renewable micro energy resources could possibly extend buoy deployments at high latitudes, charging batteries through low light levels in winter where solar harvesting is not possible. The aim of this paper is to look at the hydrokinetic energy of the wind driven drift current availability during the winter months at high latitudes. By combining the Stokes drift and Ekman surface current a value was calculated for the drift current speed within the top 3 m of the water column and converted to power density. Using the European Medium Range Weather Forecast latest model dataset ERA-5 the annual power density can be plotted at any potential buoy deployment location. The ERA-5 data was validated through comparing it to the locally measured wind speed data recorded by high latitude buoys above 55 degrees North in both the Atlantic and Pacific Oceans. The R2 values of the comparative data sets are in the range 0.35 to 0.40. This validation also shows that lower wind speeds have a closer correlation, but as wind speed increases the divergence between the observed and the modelled data sets increases. ERA-5 data at two locations at 75oN in the Atlantic basin and 80oN on the Pacific side of the Arctic Ocean was then modelled to provide power density curves at 1 m depth. The results show an increased power density available during the winter months through increased wind speeds more than 5-8 m/s compared with summer months. The increased availability of this wind driven hydrokinetic energy resource during winter months coupled with the ongoing reduction in power demands by oceanic and meteorological data buoys make further research into the development of micro turbines attached to buoys promising.

Details

Original languageEnglish
Awarding Institution
Supervisors/Advisors
Thesis sponsors
  • KESS2
Award date23 Feb 2023