CE2004 Glacial Ground Models handout

CE2004 Glacial Ground Models handout - Ground models:...

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CE2004 Dr Phil Collins, Brunel University Ground models: glaciated areas
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Plan Recap on what a Ground Model is for Extent of current and former glaciation Glacial features Deglacial ‘events’
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What is a ground model? Conceptual representation of the subsurface and surface A framework for existing multidisciplinary data A way to identify gaps in knowledge and understanding A way of communicating ground data to stakeholders and designers
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What is a ground model for? THREE-dimensional appreciation of soil and rock variability at a site FOUR-dimensional assessment of change at a site (ancient, recent, ongoing, probable, possible)
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Glaciation Where is currently affected? High Latitudes Mid Latitudes Low Latitudes Where has been affected?
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Quaternary glaciation J. Louis Agassiz (1807-1873)
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UK glacially-affected areas www.bgs.ac.uk
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Martian glaciers? http://www.psi.edu/covers.html
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Glacier characteristics Net gain Accumulation Net loss Ablation Equilibrium line Accumulation:Ablation varies over time Leads to change in Morphology, Velocity and Drainage
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Making glacial ice Snow Granular snow Firn Ice What causes the  change?
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Glacial ice under polarised light www.mos.org/soti/icecore/formation.html
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Glacial soil characteristics Proximal zone – close to source for soils Distal – distant from source Proximal Distal
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Subglacial debris Boulton & Paul 1976
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Complex drainage at the terminus of a glacier www.geo.sunysb.edu/reports/dem_2/
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This note was uploaded on 11/23/2011 for the course ENGINEERIN H203 taught by Professor Michael during the Spring '09 term at Brunel University.

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CE2004 Glacial Ground Models handout - Ground models:...

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