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Article (Scientific journals)
Morphometric dating of the fluvial landscape response to a tectonic perturbation
Demoulin, Alain
2012In Geophysical Research Letters, 39, p. 15402
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Keywords :
geomorphometry; tectonic uplift; uplift dating; landscape evolution; river incision
Abstract :
[en] Despite constant progress in numerical and field studies of landscape evolution, time evolution is still poorly constrained in many uplifted areas where low denudation rates prevent the use of low temperature thermochronology, especially outside high relief mountainous areas. Here, I show that regional statistics of the landscape metric R involving hypsometric integrals at three nested levels of a catchment are able to isolate the time effect on landscape geometry during the latter’s transient response to a tectonic perturbation. Analysis of 210 catchments from 9 regions of known uplift age worldwide shows that the regionally characteristic, R-derived SR index is in inverse power law relation with the time elapsed since a base level lowering. Suggesting a response time of 5 My, this finding has important implications for quantifying the rate of landform evolution and determining whether a landscape has reached steady-state form.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Demoulin, Alain ;  Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ)
Language :
English
Title :
Morphometric dating of the fluvial landscape response to a tectonic perturbation
Publication date :
2012
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
39
Pages :
L15402
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 19 September 2012

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