The paper presents the engineering model, WiTuS (Wind Turbine Scour), which uses the results of several previous published physical experiments with scour around cylinders to determine the time development of the scour hole around the pile due to the actual and the previous wave and current climate. The WiTuS includes: • Time-varying water level, sea states and current. • Seabed material properties. • Description of the scour geometry around the pile. Simulations presented in the paper show that for typical North Sea conditions the scour depth will be around 0.3 times the pile diameter in periods with larger waves, which is a significant reduction from 1.3 times the pile diameter which is often seen as the industry standard.

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