Reference : Morphometric dating of the fluvial landscape response to a tectonic perturbation
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Morphometric dating of the fluvial landscape response to a tectonic perturbation
Demoulin, Alain mailto [Université de Liège - ULiège > Département de géographie > Unité de géographie physique et quaternaire (UGPQ) >]
Geophysical Research Letters
American Geophysical Union
Yes (verified by ORBi)
[en] geomorphometry ; tectonic uplift ; uplift dating ; landscape evolution ; river incision
[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.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Students

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