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Uplift histories from river profiles

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Title: Uplift histories from river profiles
Authors: Pritchard, D
Roberts, GG
White, NJ
Richardson, CN
Item Type: Journal Article
Abstract: 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.
Issue Date: 16-Dec-2009
Date of Acceptance: 16-Nov-2009
URI: http://hdl.handle.net/10044/1/49607
DOI: https://dx.doi.org/10.1029/2009GL040928
ISSN: 0094-8276
Publisher: American Geophysical Union
Journal / Book Title: Geophysical Research Letters
Volume: 36
Issue: 24
Copyright Statement: © 2009 by the American Geophysical Union. An edited version of this paper was published by AGU. Pritchard, D., G. G. Roberts, N. J. White, and C. N. Richardson (2009), Uplift histories from river profiles, Geophys. Res. Lett., 36, L24301, (doi:10.1029/2009GL040928). To view the published open abstract, go to: https://dx.doi.org/10.1029/2009GL040928
Keywords: MD Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published
Article Number: L24301
Appears in Collections:Earth Science and Engineering