T72 Hydrogeomorphic Processes in Hillslopes, Rivers, and Landscapes
Sunday, 31 October 2010
1:30 PM - 5:30 PM
Hall E
ESTIMATING EROSION RATES ON ACTIVE BEDROCK CHANNELS USING IN SITU PRODUCED 10BE: IMPLICATIONS FOR LANDSCAPE EVOLUTION IN SMALL TRANSIENT RIVERS
Paper number: T72-10
Program: Technical Sessions
Time: 4:00 PM – 4:15 PM
Authors
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Paul BishopUniversity of Glasgow, Glasgow, N/A
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Derek FabelUniversity of Glasgow, Glasgow, N/A
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John JansenStockholm University, Stockholm, N/A
Abstract
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.