7.3.5 Scour Hole Plan Areas and Volumes 56.


57.


The plan areas and volumes of the scour holes generated by the various structures were predicted based upon an elliptical scour hole, after Harris et al (2010) and as observed in a large number of published experiments by others.


Table 7.3.12 provides the results of the calculations. It is noted that in the case of the jacket and tripod structures, the individual scour holes produced by each structural element could interact, possibly leading to a larger total scour volume than that attributed to the sum of the contributions from the individual holes. Stahlmann and Schlurmann (2010) show a potentially typical example, on a granular sea bed.


58.


In this table, the results are based upon a friction angle of 30° obtained from inspection of the borehole data. Length, width and plan areas apply to one structural element, in cases when there is more than one element in a structure.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Appendix 7.3 Page 21


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