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       t006-esco2020.txt (2324B)
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            1 [1]ESCO 2020, the 7th European Seminar on Computing, was held between June 8
            2 and 12.  I presented my current research on ice-sheet and sediment mechanics.
            3 
            4 Full abstract:
            5 
            6     Title: The role of granular mechanics and porous flow for ice
            7     sheet behavior in a changing climate
            8 
            9     Ice sheets and glaciers commonly flow over sedimentary deposits, in
           10     particular in areas of fast ice flow. The basal sediments are weakened by
           11     high water pressure provided by ice melt and limited drainage. Areas of
           12     fast flow are primary contributors to sea-level rise, so an accurate
           13     understanding of the thermomechanical multiphysics problem of ice, water,
           14     and sediment is crucial for predicting dynamical behavior under future
           15     climate scenarios. The in-situ observational basis from borehole
           16     measurements shows that the subglacial environment is highly dynamic. Water
           17     pressures, strain rate, and glacial sliding patterns are extremely variable
           18     in time and space, and hint towards significant complexity beyond current
           19     modelling approaches. Sediment transport by ice flow reshapes the bed, and
           20     can feed back to the ice flow physics. In this presentation I explain our
           21     efforts to numerically describe the subglacial sediment mechanics and fluid
           22     dynamics, and how the processes affect ice sheet behavior. GPU-based
           23     particle-scale simulations using the discrete element method and porous
           24     fluid dynamics provide detailed insight into sediment and meltwater
           25     dynamics. However, the intense computational requirements severely limit
           26     their applicability to coupled simulations of ice and bed. Our newest
           27     efforts use continuum models of non-local granular fluidity to simulate
           28     essential behavior on larger spatial and temporal scales. We show that the
           29     variability observed in field borehole measurements can be explained by
           30     considering the coupled dynamics of the ice-water-sediment system. From
           31     these dynamics ice flow has the ability to rapidly reshape its bed,
           32     providing additional feedbacks to ice contribution to sea level in a
           33     changing climate.
           34 
           35 Slides and video below:
           36 
           37   - slides: https://adamsgaard.dk/npub/esco2020-damsgaard.pdf
           38   - video: https://adamsgaard.dk/video/damsgaard_esco2020.mp4
           39 
           40 
           41 References:
           42 
           43 [1] https://www.esco2020.femhub.com/