Geo-engineering for floating wind turbines

Abstract

Floating wind is a potential method of generating significant renewable electrical energy. Geotechnical engineering is an important part of the design and installation process. This paper explains the seabed surveys required to determine the design parameters for mooring systems. The advantages and disadvantages of the anchor types such as drag anchors, suction piles, gravity anchors, driven piles and drilled piles will be described. The seabed survey methods described include met-ocean, bathymetry, geophysical and geotechnical. Seabed surveys are required for the fit-out port, wet storage location, export cable route, the anchor locations of the floating offshore wind turbine and the possible substation. Design of mooring systems for installation and maintenance activities are seen as priority areas for the cost reduction of floating offshore wind projects. The floating nature of the substructures permits turbine placement in previously unattainable (or prohibitively costly) sites. The installation procedure assumes a critical role in the reduction of the lifetime cost of energy production for floating offshore wind turbines.