In current modelling of excess pore pressures (EPPs) below marine structures, the irregular nature of cyclic loads and the real storm development are not taken into account. The effect of the irregular cyclic loading in time is investigated in this paper. The wind, wave and turbine loads on a gravity based foundation (GBF) are derived in the frequency domain. The real storm development is based on the CoastDat dataset. The load input is used in a program which takes the generation and dissipation of pore pressures under cyclic loading into account. Also, densification is included. The results show that the first storm in the lifetime of the GBF results in the highest EPPs. The EPP decreases in time, due to significant dissipation and densification during the build-up of a storm. Therefore, not the storms with the largest cyclic loads but the storms with the fastest build-up result in the highest EPPs, since this limits the process of densification. A large scatter is found in the maximum values of EPPs due to the irregular nature of the loads.

The aim of this paper is to optimize power cable routing in a wind farm based on the expected morphological behaviour in the design lifetime of an offshore wind farm. Up to now methods to optimize cable route layout in offshore wind farms are only based on a flat seabed and do not take the seabed dynamics into account. For offshore wind farms, migrating seabed features in the form of sand waves are of great importance and may significantly alter the position of the seabed over the life time of the wind farm. This paper discusses the optimization of power cable routing in a morphodynamic seabed by assessing the power cable burial depth in both the vertical plane, e.g. buried deeper in areas where future seabed lowering is expected, and in the horizontal plane, e.g. diverting the power cables around risk prone areas. Outcomes of the proposed method showed both cost and risk reductions for the Hollandse Kust (zuid) Wind Farm case study compared to state-of-the-art optimization based on a fixed burial depth.