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Paper No. 9
Presentation Time: 4:00 PM

ESTIMATING EROSION RATES ON ACTIVE BEDROCK CHANNELS USING IN SITU PRODUCED 10BE: IMPLICATIONS FOR LANDSCAPE EVOLUTION IN SMALL TRANSIENT RIVERS


CASTILLO, Miguel, Geographical and Earth Sciences, University of Glasgow, East Quadrangle, University Avenue, Glasgow, G12 8QQ, United Kingdom, BISHOP, Paul, Geographical and Earth Sciences, University of Glasgow, University Avenue, Glasgow, G12 8QQ, United Kingdom, FABEL, Derek, Department of Geographical & Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, United Kingdom and JANSEN, John, Department of Physical and Quaternary Geology, Stockholm University, Stockholm, SE 106 91, Sweden, Miguel.Castillo@ges.gla.ac.uk

We measured concentrations of 10Be in two small bedrock rivers catchments on the Isle of Jura (western Scotland) in order to obtain erosion rates to test models of the responses of small bedrock rivers to base-level fall. The rivers of Jura experienced an abrupt, glacioisostatic base-level fall ca. 13.5ka, triggering upstream-propagating knickpoints. 10Be concentrations were obtained in the channel bed upstream and downstream of the main knickpoint triggered by that base-level fall. The preliminary results indicate that erosion rates are slightly higher downstream of the knickpoints, reflecting incomplete accommodation of the base-level fall by knickpoint retreat, ongoing glacioisostatic uplift and/or knickpoint rotation.

Session No. 72

T135. Hydrogeomorphic Processes in Hillslopes, Rivers, and Landscapes
Sunday, 31 October 2010: 1:30 PM-5:30 PM
Hall E (Colorado Convention Center)
Geological Society of America Abstracts with Programs. Vol. 42, No. 5, p.179
© Copyright 2010 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.
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