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(Article of periodic en Anglais - 2013)

Document title

Exploring geochemical controls on weathering and erosion of convex hillslopes : beyond the empirical regolith production function

Authors(s) and Affiliation(s)

LEBEDEVA M.I. (1) ; BRANTLEY S.L. (1) ;
(1) Earth and Environmental Systems Inst., The Pennsylvania State Univ., Park, ETATS-UNIS

Abstract

The AA. develop a model describing steady-state regolith production caused by mineral dissolution on hillslopes which have attained an equilibrium parabolic profile. When the hillslope lowers at a constant rate, the rate of chemical weathering is highest at the ridgetop where curvature is highest and the ridge develops the thickest regolith. This result derives from inclusion of all the terms in the mathematical definition of curvature. Here, the AA. similarly explore model predictions of the effect of curvature at the hillslope scale. The hillslope model shows that when erosion rates are small and vertical porefluid infiltration is moderate, the hill weathers at both ridge and valley in the erosive transport-limited regime. For this regime, the reacting mineral is weathered away before it reaches the land surface. In contrast, when the erosion rate increases or porefluid velocity decreases, denudation occurs in the weathering-limited regime. These predictions are broadly consistent with the observations

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no15 [pp. 1793-1807]

Bibliographic references : 1 p.

Collation : 15 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3424

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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