Browsing by Author "Worster, Michael Grae"

Now showing items 1-10 of 10

  • A physically based parameterization of gravity drainage for sea-ice modelling 

    Rees, Jones David W; Worster, Michael Grae (Wiley on behalf of the American Geophysical UnionJournal of Geophysical Research: Oceans, 2014-09-02)
    We incorporate a physically derived parameterization of gravity drainage, in terms of a convective upwelling velocity, into a one-dimensional, thermodynamic sea- ice model of the kind currently used in coupled climate ...

  • An experimental and theoretical study of the dynamics of grounding lines 

    Pegler, Samuel Santeri; Worster, Michael Grae (Cambridge University Press, 2013-07-01)
    We present an experimental and theoretical study of a thin, viscous fluid layer that flows radially under gravity from a point source into a denser inviscid fluid layer of uniform depth above a rigid horizontal surface. ...

  • Assessment of ice flow dynamics in the zone close to the calving front of Antarctic ice shelves 

    Wearing, Martin G; Hindmarsh, Richard CA; Worster, Michael Grae (International Glaciological SocietyJournal of Glaciology, 2015-12-01)
    We investigate the relationship between four ice-shelf characteristics in the area close to the calving front: ice flow speed, strain rate, ice thickness and shelf width. Data are compiled for these glaciological parameters ...

  • Dynamics of laterally confined marine ice sheets 

    Kowal, Katarzyna N; Pegler, Samuel S; Worster, Michael Grae (Cambridge University PressJournal of Fluid Mechanics, 2016-02-03)
    We present an experimental and theoretical study of the dynamics of laterally confined marine ice sheets in the natural limit in which the long, narrow channel into which they flow is wider than the depth of the ice. A ...

  • Flow-induced compaction of a deformable porous medium 

    Hewitt, Duncan; Nijjer, Japinder S; Worster, Michael Grae; Neufeld, Jerome Anthony (American Physical SocietyPhysical Review E, 2016-02-24)
    Fluid flowing through a deformable porous medium imparts viscous drag on the solid matrix, causing it to deform. This effect is investigated theoretically and experimentally in a one-dimensional configuration. The experiments ...

  • Freeze fracturing of elastic porous media: a mathematical model 

    Vlahou, I; Worster, Michael Grae (Royal Society, 2015-02-11)
    We present a mathematical model of the fracturing of water-saturated rocks and other porous materials in cold climates. Ice growing inside porous rocks causes large pressures to develop that can significantly damage the ...

  • Freezing colloidal suspensions: periodic ice lenses and compaction 

    Anderson, Anthony M; Worster, Michael Grae (CUP, 2014-10-14)
    Recent directional solidification experiments with aqueous suspensions of alumina particles (Anderson & Worster 2012) motivate a model for freezing colloidal suspensions that builds upon a theoretical framework developed ...

  • Lubricated viscous gravity currents 

    Kowal, Katarzyna N; Worster, Michael Grae (CUPJournal of Fluid Mechanics, 2015-02-10)
    We present a theoretical and experimental study of viscous gravity currents lubricated by another viscous fluid from below. We use lubrication theory to model both layers as Newtonian fluids spreading under their own weight ...

  • On the thermodynamic boundary conditions of a solidifying mushy layer with outflow 

    Rees, Jones David W; Worster, Michael Grae (CUPJournal of Fluid Mechanics, 2014-11-27)
    The free-boundary problem between a liquid region and a mushy layer (a reactive porous medium) must respect both thermodynamic and fluid dynamical considerations. We develop a steady two-dimensional forced-flow configuration ...

  • Sea-ice thermodynamics and brine drainage 

    Worster, Michael Grae; Rees Jones, DW (Royal Society PublishingPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2015-07-13)
    Significant changes in the state of the Arctic ice cover are occurring. As the summertime extent of sea ice diminishes, the Arctic is increasingly characterized by first-year rather than multi-year ice. It is during the ...