Uplift Histories from River Profiles

Pritchard, D. and Roberts, G. G. and White, N. J. and Richardson, C. N. (2009) Uplift Histories from River Profiles. Geophysical Research Letters, 36 (24). L24301. ISSN 0094-8276, ESSN: 1944-8007 DOI https://doi.org/10.1029/2009GL040928

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Longitudinal river profiles, where elevation of a river bed is plotted as a function of distance along the river bed, contain information about uplift rate. When a region adjacent to a reference level (e.g., sea level) is uplifted, a rapid change in gradient occurs near the river mouth. The erosional process causes this change in gradient to migrate upstream. Thus a river profile is effectively a ‘tape recording’ of the uplift rate history, provided that the erosional process can be adequately parameterized. Here, we use a non-linear equation to relate the shape of a river profile, z(x), to uplift rate history, U(t). If erosion is assumed to be dominated by knickpoint retreat, an inverse model can be formulated and used to calculate uplift rate histories. Our model builds upon standard stream profile analysis, which focuses on the relationship between profile slope and drainage area. We have applied this analytical approach to river profiles from the Bié Dome, Angola. Calculated uplift rate histories agree with independent geologic estimates.

Item Type: Article
Additional Information: BPI cml Copyright 2009 by the American Geophysical Union, this paper is Green Open Access in accordance with the conditions set out here: http://www.sherpa.ac.uk/romeo/issn/0094-8276/
Uncontrolled Keywords: 09AREP; IA59;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 08 - Green Open Access
Journal or Publication Title: Geophysical Research Letters
Volume: 36
Page Range: L24301
Identification Number: https://doi.org/10.1029/2009GL040928
Depositing User: Sarah Humbert
Date Deposited: 26 Nov 2009 09:49
Last Modified: 28 Apr 2014 11:43
URI: http://eprints.esc.cam.ac.uk/id/eprint/1227

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