Numerical analyses of energy balance and installation mechanisms of large-diameter tapered monopiles by impact driving

Large-diameter monopiles are widely used as the foundation to support offshore wind turbines (OWTs) in shallow coastal waters. The benefits of small-to-medium diameter tapered piles have been reported in the past. The potential use of large-diameter tapered monopiles installed by impact driving to support OWTs is thus presented, and then...

Risk assessment of offshore fire accidents caused by subsea gas release

Subsea gas release is an industrial hazard that can impose fire hazards on offshore facilities near the gas surfacing area. However, risk assessment of the fire caused by subsea gas release is challenged due to inadequate recognition of the knowledge of subsea gas release mechanism and resulting hazards. At present, minimal researches...

Comparative Assessment of Possible Topologies of Offshore Transmission Network in the North Sea: Role of the North Sea Wind Power Hub at the Dogger Bank

TenneT’s vision of the North Sea Infrastructure (NSI) creates a basis for a joint European approach up to 2050 which focuses specifically on developing the North Sea as a source and distribution hub for Europe’s energy transition. High wind speed, central location and shallow water qualify the Dogger Bank as the location of the central hub.<br/...

Nonlinear Wave Loads on Offshore Wind Support Structure

Though booming, offshore wind development is constrained by its high cost. One potential way to meet this challenge is to reduce the uncertainty in wave modeling and hydrodynamic loads calculation model for offshore wind support structure design. The thesis covers two aspects for calculating loads acting on a offshore wind support structure: an...

Bucket Foundation in Clay for OWT Subjected to Combined Cyclic Loads

This thesis project investigates the bucket foundation in clay subjected to cyclic loads. The cyclic irregular loading history in this thesis was represented by the equivalent number of cycles Neq with a certain level of cyclic to average stress ratio tcy / ta which can be derived using cyclic shear strain accumulation procedure developed in NGI...

Optimization of ship’s subdivision arrangement for offshore sequential ballast water exchange using a non-dominated sorting genetic algorithm

DP safety for offshore drilling and well intervention vessels