Offshore Wind

Harnessing wind energy in offshore environments.

Similar to land-based wind technologies, offshore wind uses turbines to generate energy which is delivered to the shore via an export cable. A main advantage of offshore wind is the stronger and more consistent winds that blow offshore, allowing the use of larger turbine blades. The development of offshore wind in Europe and Asia has preceded development activities in other parts of the world. However, several projects in the United States are currently underway. While the most common offshore wind energy technology is a three-bladed horizontal axis turbine, there are a variety of foundation types which can support the deployment of devices in a range of aquatic environments – shallow nearshore habitats to deeper offshore environments.

 

Monopile Foundation

 

Monopile foundations are used at shallow depths (0-30 m) and consist of a pile being driven to varying depths into the seabed (10-40 m) depending on the soil conditions. The pile-driving construction process is an environmental concern as the noise produced is incredibly loud and propagates far in the water, even after mitigation strategies such as bubble shields, slow start, and acoustic cladding are employed. As with land-based wind energy, collision risk with birds and bats is a major concern, though the impact is more difficult to quantify because carcasses that provide evidence of collisions become lost at sea. While the footprint of offshore wind energy is relatively small, it may still cause scouring. As with all electricity generation, there is a slight concern that electromagnetic fields generated by power cables may affect animals that use Earth's natural magnetic field for orientation, navigation, and hunting. Likewise, chemicals such as anti-corrosion paint and small amounts of oil and grease may enter the waterbody during spills, though some turbine designs do not require lubrication. Artificial reefing is likely to occur around wind farms as the new hard substrate provides protection and attracts colonizing invertebrates.

Tripod Fixed Bottom

 

Tripod fixed bottom foundations are used at transitional depth (20-80 m) and consist of three legs connecting to a central shaft that supports the turbine base. Each leg has a pile driven into the seabed creating a wide foundation that allows for the piles to be placed at a shallower depth in the seabed. The environmental effects are very similar to monopiles, except that the footprint is a little larger.

Gravity Foundation

 

Gravity foundations are used at shallow depths (0-30 m) and consist of a large and heavy base constructed of steel or concrete to rest on the seabed. The footprint is relatively large and may cause scouring, artificial reefing, or physical destruction of habitats upon introduction. Otherwise, the environmental effects are similar to monopiles.

Gravity Tripod

 

Gravity tripod foundations are used at transitional depths (10-40 m) and consist of two heavy concrete structures connected by three legs where one structure sits on the seabed while the other sits above the water. Very few offshore windfarms are currently using this foundation. The environmental concerns are identical to those of gravity foundations, though the scouring effect may be less significant depending on the design.

Floating Structure

 

Floating structure foundations are used at deep depths (40-900 m) and consist of a balanced floating structure moored to the seabed with fixed cables. The floating structure may be stabilized using buoyancy, mooring lines, or a ballast. The mooring lines may cause minor scouring or pose a risk of collision, but the turbine foundation is mostly located in the upper layer of the water column where there tend to be less organisms.

Total Results: 1247
Title Author Datesort ascending Type of Content Technology Type Stressor Receptor
Wake Effects on Middelgrund Windfarm Jørgensen, H., Frandsen, S., Vølund, P. July 2003 Report Wind Energy general, Offshore Wind Energy Removal Nearfield Habitat
Cape Wind Submerged Aquatic Vegetation Diver Survey Woods Hole Group, Inc. July 2003 Report Wind Energy general, Offshore Wind Nearfield Habitat
Utgrunden Offshore Wind Farm Measurements of Underwater Noise Ingemansson Technology June 2003 Report Wind Energy general, Offshore Wind Noise
Onshore Environmental Impact Statement for Lincs, Docking Shoal, and Race Bank OSW Farms Centrica Energy June 2003 Report Wind Energy general, Offshore Wind Static Device Nearfield Habitat
Strategy of Approach Demersal Fish Fauna Grift, R., Tien, N. May 2003 Report Wind Energy general, Offshore Wind Fish
Marine Wind Farms and Cetaceans Doleman, S., Simmonds, M., Keith, S. May 2003 Conference Paper Wind Energy general, Offshore Wind Noise Marine Mammals, Cetaceans
Assessment of Sub-Sea Acoustic Noise and Vibration from Offshore Wind Turbines and its Impact on Marine Wildlife; Initial Measurements of Underwater Noise during Construction of Offshore Windfarms, and Comparison with Background Noise Nedwell, J., Langworthy, J., Howell, D. May 2003 Report Wind Energy general, Offshore Wind Noise Fish, Marine Mammals
Short-Term Effects of the Construction of Wind Turbines on Harbour Porpoises at Horns Reef Tougaard, J., et al. April 2003 Report Offshore Wind Noise, Static Device Marine Mammals
Birds and Offshore Wind Farms: A Hot Topic in Marine Ecology Exo, K., Hüppop, O., Garthe, S. April 2003 Journal Article Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Seabirds, Ecosystem, Nearfield Habitat
Offshore Wind Turbine Wakes Measured by Sodar Barthelmie, J., et al. April 2003 Journal Article Wind Energy general, Offshore Wind Energy Removal Nearfield Habitat
Effects of offshore wind farms on birds: "Cuisinarts of the sky" or just tilting at windmills? Tingley, M. March 2003 Thesis Wind Energy general, Offshore Wind Dynamic Device Birds, Passerines, Seabirds
Thermal Animal Detection System (TADS): Development of a Method for Estimating Collision Frequency of Migrating Birds at Offshore Wind Turbines Desholm, M. January 2003 Report Wind Energy general, Offshore Wind Dynamic Device Birds, Passerines, Seabirds, Waterfowl
Offshore Wind Farms in the Western Great Lakes: An Interdisciplinary Analysis of their Potential Hingtgen, J. January 2003 Thesis Wind Energy general, Offshore Wind
Movements of Seals from Rødsand Seal Sanctuary Monitored by Satellite Telemetry Dietz, R., et al. January 2003 Report Wind Energy general, Offshore Wind Marine Mammals, Pinnipeds
Renewable Energy from the Ocean Pelc, R., Fujita, R. November 2002 Journal Article Marine Energy general, Wind Energy general, Offshore Wind
Future Offshore: A Strategic Framework for the Offshore Wind Industry UK Department of Trade and Industry November 2002 Report Wind Energy general, Offshore Wind Socio-economics
Burbo Offshore Wind Farm Volume 2: ES Biological Environment The University of Liverpool Centre for Marine and Coastal Studies September 2002 Report Wind Energy general, Offshore Wind Static Device Benthic Invertebrates, Fish, Marine Mammals, Nearfield Habitat
High Level Environmental Screening Study for Offshore Wind Farm Developments - Marine Habitats and Species Project Hiscock, K., Tyler-Walters, H., Jones, H. August 2002 Report Wind Energy general, Offshore Wind Dynamic Device, EMF, Energy Removal, Noise, Static Device Benthic Invertebrates, Birds, Seabirds, Ecosystem, Farfield Environment, Fish, Marine Mammals, Nearfield Habitat, Socio-economics
Technologies and their Influence on Future UK Marine Resource Development and Management Side, J., Jowitt, P. July 2002 Journal Article Marine Energy general, Wave, Wind Energy general, Offshore Wind Socio-economics
The Role of the DPSIR Approach and Conceptual Models in Marine Environmental Management: An Example for Offshore Wind Power Elliott, M. June 2002 Journal Article Wind Energy general, Offshore Wind Socio-economics
Postdevelopment Experiments to Detect Anthropogenic Disturbances: The Case of Sea Ducks and Wind Parks Guillemette, M., Larsen, J. June 2002 Journal Article Wind Energy general, Offshore Wind Static Device Birds, Waterfowl
Predicting the Displacement of Common Scoter Melanitta nigra from Benthic Feeding Areas Due to Offshore Windfarms Kaiser, M., et al. March 2002 Report Wind Energy general, Offshore Wind Static Device Birds, Waterfowl
Open Ocean Aquaculture and Offshore Wind Farms. A feasibility study on the multifunctional use of offshore wind farms and offshore mariculture in the North Sea area Buck, B. January 2002 Report Wind Energy general, Offshore Wind Socio-economics, Fishing
Recommendations for project-related studies of possible impacts of marine wind farms during construction and operation on birds Hüppop, O., Exo, K., Garthe, S. January 2002 Journal Article Wind Energy general, Offshore Wind Birds
Potential Effects of Offshore Wind Developments on Coastal Processes Beiboer, F., Cooper, B. January 2002 Report Wind Energy general, Offshore Wind Energy Removal Farfield Environment, Nearfield Habitat
Gunfleet Sands Offshore Wind Farm Environmental Statement GE Wind Energy January 2002 Report Wind Energy general, Offshore Wind Static Device Benthic Invertebrates, Birds, Fish, Marine Mammals, Nearfield Habitat, Socio-economics, Environmental Impact Assessment
Acoustic and Electromagnetic Noise Induced by Wind Mills - Implications for Underwater Surveillance Systems Pilot Study Fristedt, T., Morén, P., Söderberg, P. September 2001 Report Wind Energy general, Offshore Wind EMF, Noise Socio-economics
The Potential Effects of Electromagnetic Fields Generated by Cabling Between Offshore Wind Turbines upon Elasmobranch Fishes Gill, A., Taylor, H. September 2001 Report Wind Energy general, Offshore Wind EMF Fish
Life Cycle Assessment of a 150 MW Offshore Wind Turbine Farm at Nysted/Roedsand, Denmark Properzi, S., Herk-Hansen, H. July 2001 Conference Paper Wind Energy general, Offshore Wind Socio-economics, Life Cycle Assessment
Environmental Consequences of Offshore Wind Power Generation Parkinson, K. April 2001 Thesis Wind Energy general, Offshore Wind Energy Removal, Static Device Birds, Fish, Marine Mammals
Assessment of the Effects of Offshore Wind in Birds Percival, S. January 2001 Report Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Seabirds, Waterfowl
Assessment Of The Effects Of Noise And Vibration From Offshore Wind Farms On Marine Wildlife Vella, G., et al. January 2001 Report Wind Energy general, Offshore Wind Noise Fish, Marine Mammals
Noise Measurements and Analysis: Offshore Pile-Driving Underwater and Above-Water Ødegaard and Danneskiold-Samsøe October 2000 Report Wind Energy general, Offshore Wind Noise
Horns Rev Offshore Wind Farm Environmental Impact Assessment: Summary of EIA Report Elsamprojekt May 2000 Report Wind Energy general, Offshore Wind Ecosystem, Socio-economics, Environmental Impact Assessment
Effects of Marine Windfarms on the Distribution of Fish, Shellfish and Marine Mammals in the Horns Rev Area Hoffmann, E., et al. May 2000 Report Wind Energy general, Offshore Wind EMF, Noise, Static Device Benthic Invertebrates, Fish, Marine Mammals, Pinnipeds
Underwater Noise Measurements, Analysis, and Predictions Degn, U. March 2000 Report Wind Energy general, Offshore Wind Noise
Effects on Birds of an Offshore Wind Park at Horns Rev: Environmental Impact Assessment Noer, H., et al. January 2000 Report Wind Energy general, Offshore Wind Dynamic Device, Static Device Birds, Raptors, Seabirds, Waterfowl, Socio-economics, Environmental Impact Assessment
Nocturnal flight activity of sea ducks near the windfarm Tunø Knob in the Kattegat Tulp, I., et al. December 1999 Report Wind Energy general, Offshore Wind Birds, Waterfowl
Windpower and Grey Seals: An Impact Assessment of Potential Effects by Sea-Based Windpower Plants on a Local Seal Population Sundberg, J., Söderman, M. December 1999 Report Wind Energy general, Offshore Wind Marine Mammals, Pinnipeds
Assessing the Impact of the Tunø Knob Wind Park on Sea Ducks: The Influence of Food Resources Guillemette, M., Larsen, J., Clausager, I. February 1999 Report Wind Energy general, Offshore Wind Birds, Seabirds, Shorebirds
Impact Assessment of an Off-shore Wind Park on Sea Ducks Guillemette, M., Larsen, J., Clausager, I. March 1998 Report Wind Energy general, Offshore Wind Noise, Static Device Birds, Waterfowl, Socio-economics, Environmental Impact Assessment
Nocturnal Flight Patterns and Altitudes of Diving Ducks in the IJsselmeer Area Dirksen, S., et al. December 1997 Journal Article Wind Energy general, Offshore Wind Birds, Waterfowl
Effect of Tunø Knob Windpark on Birds Guillemette, M., Larsen, J., Clausager, I. January 1997 Report Wind Energy general, Offshore Wind Birds, Seabirds
Bird Casualties Caused by a Wind Energy Project in an Estuary Musters, C., Noordervliet, M., terKeurs, W. March 1996 Journal Article Wind Energy general, Offshore Wind Dynamic Device Birds, Seabirds, Shorebirds, Waterfowl
Ocean Energies: Environmental, Economic and Technological Aspects of Alternative Power Sources Charlier, R., Justus, J. September 1993 Book Marine Energy general, Wind Energy general, Offshore Wind Farfield Environment, Socio-economics
An improved marine radar system for studies of bird migration Cooper, B., et al. January 1991 Journal Article Wind Energy general, Offshore Wind Birds
Ocean Plug Planned Project Site Annex IV Marine Energy general, Wave, Wind Energy general, Offshore Wind

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