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Postglacial topographic evolution of glaciated valleys: a stochastic landscape evolution model

Dadson, Simon J.; Church, Michael. 2005 Postglacial topographic evolution of glaciated valleys: a stochastic landscape evolution model. Earth Surface Processes and Landforms, 30 (11). 1387. 10.1002/esp.1199

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Abstract/Summary

The retreat of valley glaciers has a dramatic effect on the stability of glaciated valleys and exerts a prolonged influence on the subsequent fluvial sediment transport regime. We have studied the evolution of an idealized glaciated valley during the period following retreat of ice using a numerical model. The model incorporates a stochastic process to represent deep-seated landsliding, non-linear diffusion to represent shallow landsliding and an approximation of the Bagnold relation to represent fluvial sediment transport. It was calibrated using field data from several recent surveys within British Columbia, Canada. We present ensemble model results and compare them with results from a deterministic linear-diffusion model to show that explicit representation of large landslides is necessary to reproduce the morphology and channel network structure of a typical postglacial valley. Our model predicts a rapid rate of fluvial sediment transport following deglaciation with a subsequent gradual decline, similar to that inferred for Holocene time. We also describe how changes in the model parameters affect the estimated magnitude and duration of the paraglacial sediment pulse.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/esp.1199
Programmes: CEH Topics & Objectives 2009 - 2012 > Water > WA Topic 1 - Variability and Change in Water Systems > WA - 1.3 - Model, attribute and predict impacts of climate and land cover change on hydrological and freshwater systems
CEH Sections: Harding (to July 2011)
ISSN: 0197-9337
Additional Keywords: landscape evolution, stochastic processes, non-linear diffusion, paraglacial processes, climate change
NORA Subject Terms: Earth Sciences
Date made live: 21 Apr 2011 11:12
URI: http://nora.nerc.ac.uk/id/eprint/11371

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