The Wave Dragon technology is a floating slack moored wave energy converter. The larger versions of Wave Dragon with 4MW or more installed power are moored in relatively deep water to take advantage of the ocean waves before they lose energy as they reach the coastal area. The device allows ocean waves to overtop a ramp, which elevates water to a reservoir above sea level. This artificial ‘head’ of water is subsequently released (through gravity alone) through a large number of propeller turbines and in this way transformed into electricity. The vertical turbines are directly coupled to generators – the rotor axis being the only moving parts of the device. The unit comprises a central reservoir platform, with a doubly curved ramp. Two curved wave reflecting wings that concentrate the power of incoming waves are attached to the platform. The Wave Dragon device is fixed to a forward anchor buoy which) is moored through polymer-ropes in combination with chains to six to 10 anchors depending on site and wave climate.
The site is approximately 20km off the Pembrokeshire Coast south west of the opening to Milford Haven estuary, in the south west tip of Wales, U.K.
Grid Connection initial application made.
Proximity check to The Crown Estate Submitted and Approved.
EIA Scoping Report Submitted.
See the Wave Dragon Pre-Commercial Demonstration Project for technology history. Surveys have been taken of the Milla Fjord site during 2013 and 2014. Side scan multi bean sonar, ship-based ACDP water column data, and a range of radar and acoustic profiles have been taken. Physical sampling was also taken. Geophysical data was taken at both surveys and geophysical results have been drawn from comparison between both surveys.
Both survey results are being analysed and compared as well as the physical samples taken.
Key Environmental Issues
These will be drawn from the data and environmental designations of surrounding locations. However, at the time of writing the site is within a proposed European Special Protection Area as (to be) designated under the European Birds Directive (as enacted into UK Law). Thus, a thorough EIA / Environmental Monitoring program will be undertaken.
Papers, Reports, Research Studies
- Case Study – Wave Dragon Milford Haven Project - Aqua-RET
- Feasibility and LCA for a Wave Dragon platform with wind turbines
- "Small is Beautiful" - But will Small WECs Ever Become Commercial?
- SEACAMS 2 R&D Project SC2_RD_B30. ‘Seabed composition and dynamics within an offshore wave dominated site: A site-specific study of seabed sediments, feature dynamics and the implications for the use of Stevpris style anchors’.
Baseline Assessment: Wave Dragon Project - Milla Fjord Site
|Receptor||Study Description||Design and Methods||Results||Status|
|Physical Environment||Ship based ADCP surveys and side-scan sonar surveys in 2013, 2014 and 2018. ||• Four multibeam echo sounder surveys of the site in 2013, 2014 and 2018. |
• Targeted wreck surveys in 2013, 2017 and 2018.
• High resolution sub-bottom profiler survey in 2018