Abstract :

In connection with a wave energy mapping programme, OCEANOR have evaluated the new Directional WAVERIDER buoy from Datawell in the Netherlands. The buoy was deployed from June - November 1990 alongside a reference directional wave buoy performing long term measurements for the oil industry off Møre county, mid-Norway. The results illustrate that the Directional WAVERIDER is capable of providing high quality wave direction statistics. at least under the deep water conditions under which the current trials were undertaken. Combined with our experience of good reliability after operating this buoy at various locations for over I year. its ease of deployment and lower cost compared with conventional competing buoy systems makes this buoy a real alternative. However, some modifications on the data collection side will be needed to give it worldwide application.

1 Introduction

Interest in renewable energy is again increasing and with this in mind, OCEANOR have recently embarked on a programme to improve our capability of mapping the available wave energy worldwide. The programme involves developing a package to describe the wave environment at any stage in a wave power project from feasibility study to operational monitoring. A few years ago the only available wave information for remote areas of the world's oceans, away from areas such as the North Sea where a good deal of measured data are available was from visual ship observations (e.g. Global Wave Statistics, 1986). However, such data could only give rough guidelines in some areas due to rather large wave climatic gradients. Nowadays we have wave data available both from satellites - OCEANOR hold 4 years of data from the GEOSAT altimeter - which can be combined with global wave model data (e.g. the British Meteorological Office's wave model) to derive more reliable wave statistics for regions where measurements are not available.

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