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TIDAL TURBINE FOUNDATIONS  SUPPORT AND INSTALLATION DESIGN WWW.RAMBOLL.COM/ENERGY

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Page 1: TIDAL TURBINE FOUNDATIONS - Ramboll Group/media/files/rgr/documents/tidal/tidal_turbine... · TIDAL TURBINE FOUNDATIONS SUPPORT AND INSTALLATION DESIGN The UK tidal stream resource

TIDAL TURBINEFOUNDATIONS SUPPORT AND INSTALLATION DESIGN

WWW.RAMBOLL.COM/ENERGY

Page 2: TIDAL TURBINE FOUNDATIONS - Ramboll Group/media/files/rgr/documents/tidal/tidal_turbine... · TIDAL TURBINE FOUNDATIONS SUPPORT AND INSTALLATION DESIGN The UK tidal stream resource

TIDAL TURBINE FOUNDATIONSSUPPORT AND INSTALLATIONDESIGN

The UK tidal stream resource isestimated at 10% of the world'ssupply and in the future this couldprovide 5% of the UK's electricitydemand*. There are current leases of 1GWe inUK waters and this is projectedto grow to upwards of 40GWe by2050**. This would represent tensof thousands of devices installed inthe waters around the UK andelsewhere. 

Fast Developing Technology 

Tidal stream technology isdeveloping rapidly and there aremany promising device types atprototype stage operating at testsites such as EMEC. By their trial nature, many of theseare supported on foundations thatare not suitable for mass productionand the next critical stage is thedevelopment of repeatable efficientfoundations that can be applied toarrays of 10 or more and then

eventually to larger farms in themode of the offshore wind sector. 

Unique Tidal Stream Challenges

The challenges associated with tidalstream foundations are unique andrequire new ideas to design efficientand economically viable structures.Uneven rocky seabeds, combinedwith very high current speeds,water turbulence and a structurethat can only be accessed remotelyare among the many challengesbeing resolved by Ramboll. Installation in tidal flows is a majorconsideration and the techniquesused also need considerabledevelopment to go cost-effectivelyfrom prototype to array and largefarm. Ramboll is currently working on a10MW array from concept study todetailed design for both foundationdesign and installationmethodology. This is drawing on

our considerable experience inmarine engineering for both the Oiland Gas and Offshore Windsectors. 

Concept Development andStructural and GeotechnicalAnalysis 

Ramboll have a long track record ofinventive and innovative design inthe marine environment and fortaking advantage of therepeatability of structure for therenewable sector such as inoffshore wind.We have developed an in-housesoftware package "ROSAP" thatincludes hydrodynamic, static anddynamic loading, structure/soilinteraction, push over analysis andfatigue life calculations.ROSAP has been instrumental inour success in the design ofoffshore wind foundations and it isbeing used extensively in ouranalysis of the 10MW tidal testarray. 

Offshore Installation Methodology 

Ramboll have been involved in theinstallation of many offshorestructures over the past threedecades and installation andtransportation analysis is integral toour work on the offshore windfoundations. Ramboll is working closelywith specialist sub-contractors onthe installation methodology of a10MW tidal test array to developtechniques such as dynamicpositioning and subsea pile drillingthat can reduce the criticalinstallation programme.

Certification

Ramboll have extensive experiencein gaining certification for novel andnew offshore technologies from ourexperience in both Oil and Gas andOffshore Wind and are workingclosely with the 3rd party approveron the 10MW tidal test array. 

Tidalstream Project References

• Aquamarine Tidal Stream, UKproject 2007-2008 - Structuraldesign of prototype andintegration of electrical andmechanical systems.

• Tidal Generation Limited, UKproject 2011-2012 - Structural andinstallation methodology design ofprototype and integration ofelectrical systems. 

  

 

 

 

 

 

 

 

Tidal Energy

Tides are caused by thegravitational effects of the sun andthe moon on the water bodies ofthe earth, offering a limitless andhighly predictable source ofrenewable energy. The water depthchanges caused by the gravitationalpull can be captured by tidal rangedevices and the water flow can beharnessed by tidalstream devices toproduce electricity. The range andflow speed are effected by localconditions of sea shore and sea bedand some of the most promisingareas for tidal stream powergeneration lie off the coast of theUK. *   Per the Carbon Trust** Department of Energy and    Climate Change

FACTS ABOUT RAMBOLL FOR FURTHER INFORMATION

 Ramboll is a leading engineering, design and consultancycompany founded in Denmark in 1945. We employ closeto 10,000 experts, and with more than 200 offices in 23countries we emphasise local experience combined witha global knowledge base. We constantly strive to achieveinspiring and exacting solutions that make a genuinedifference to our customers, end-users and society as awhole. Ramboll's Offshore Wind division has almost 100dedicated employees situated in our three main offices inLondon, Copenhagen and Esbjerg as well as in our huboffices in Hamburg and New York.

For further information on Ramboll's Tidalstream andoffshore engineering capabilities please contact SurinderMann at Ramboll Energy, 60 Newman Street, LondonW1T 3DA, UK.Tel. +44 (0) 20 7631 5291.E-mail:[email protected]