Barrow, reported by Whitehouse et al (2011), can be used to provide information regarding the shape of such a truncated scour hole.


Table 7.3.1. Schedule of prediction methods used in the study Method reference


Type of structure and environmental loading


Conical gravity base: in waves


Conical gravity base: in currents


Conical gravity base: in waves & currents combined


Suction bucket: in currents alone


Suction bucket: in waves and currents combined Monopile: in currents Monopile: in waves


Monopile: in waves and currents


Jacket: suction caissons in currents alone


Jacket: suction caissons in waves


Jacket: suction caissons in waves and currents


Jacket: horizontal bracing elements


Tripod: in currents Tripod: in waves


Tripod: in currents and waves


Scour including seabed material strength


Khalfin (2007) with diameter expressed as base of cone value (on the assumption that the top of the base plate is at or below seabed level)


Khalfin (1983) modified by Bos et al (2002a) with diameter expressed as base of cone value


Khalfin (2007) with the sea bed friction velocity increased to cover effects of wave-current interaction by using Soulbsy and Clarke (2005)


Khalfin (1983) modified by Bos et al (2002a)


Suction bucket: in waves Bos et al (2002b) and informed by Yeow and Cheng (2003) for contribution from upper tower


Bos et al (2002b) and informed by Yeow and Cheng (2003) for contribution from upper tower Harris et al (2010)


Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Jacket: main piled columns Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Khalfin (1983) modified by Bos et al (2002a)


Bos et al (2002b) followed by Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Bos et al (2002b) followed by Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008) Sumer and Fredsϕe (2002)


Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Harris et al (2010), Sumer and Fredsϕe (2002) and Raaijmakers and Rudolph (2008)


Annandale (1995); Annandale and Smith (2001); Annandale (2006) soil strength methods


Plan form of scour holes Harris et al (2010) Effects of soil type upon scour development


Analysis of D50 grain sizes from grab samples


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Appendix 7.3 Page 2


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