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Hydrodynamics and risk analysis of iceberg impacts with offshore structures

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dc.contributor.author McTaggart, Kevin Andrew
dc.date.accessioned 2011-01-20T18:28:03Z
dc.date.available 2011-01-20T18:28:03Z
dc.date.copyright 1989
dc.date.issued 2011-01-20T18:28:03Z
dc.identifier.uri http://hdl.handle.net/2429/30733
dc.description.abstract The evaluation of design iceberg impact loads for offshore structures and the influence of hydrodynamic effects on impact loads are examined. Important hydrodynamic effects include iceberg added mass, wave-induced oscillatory iceberg motions, and the influence of a large structure on the surrounding flow field and subsequent velocities of approaching icebergs. The significance of these phenomena has been investigated using a two-body numerical diffraction model and through a series of experiments modelling the drift of various sized icebergs driven by waves and currents approaching a large offshore structure. Relevant findings from the hydrodynamic studies have been incorporated into two probabilistic models which can be used to determine design iceberg collision events with a structure based on either iceberg kinetic energy upon impact or global sliding force acting on the structure. Load exceedence probabilities from the kinetic energy and sliding force models are evaluated using the second-order reliability method. Output from the probabilistic models can be used to determine design collision parameters and to assess whether more sophisticated modelling of various impact processes is required. The influence of the structure on velocities of approaching icebergs is shown to be significant when the structure horizontal dimension is greater than twice the iceberg dimension. As expected, wave-induced oscillatory motions dominate the collision velocity for smaller icebergs but have a negligible effect on velocity for larger icebergs. en
dc.language.iso eng en
dc.publisher University of British Columbia en
dc.relation.ispartofseries UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] en
dc.subject Icebergs en
dc.subject Offshore structures en
dc.subject Ice mechanics -- Mathematical models en
dc.subject Sea ice -- Mathematical models en
dc.title Hydrodynamics and risk analysis of iceberg impacts with offshore structures en
dc.type Electronic Thesis or Dissertation en
dc.degree.name Doctor of Philosophy - PhD en
dc.degree.discipline Civil Engineering en
dc.degree.grantor University of British Columbia en
dc.degree.campus UBCV en
dc.description.scholarlevel Graduate en


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