Numerical modelling of erosion processes in the Himalayas of Nepal: effects of spatial variations of rock strength and precipitation - Aix-Marseille Université Access content directly
Journal Articles The Geological Society, London, Special Publications Year : 2006

Numerical modelling of erosion processes in the Himalayas of Nepal: effects of spatial variations of rock strength and precipitation

Abstract

The interplay between tectonics and erosion has a predominant control on the evolution of the morphology of mountain belts. Here we investigate the modalities of deformation in Central Nepal on a c. 100 ka time scale in response to tectonic and external forcings, through the use of a finite-element thermomechanical model coupled with an integrative denudation formulation that accounts for fluvial incision and hillslope landsliding. We study the complex coupling existing between tectonics and erosion, with special emphasis on the influences of rock strength and rainfall distributions. Our results underline the key role played by lithologic variations in the elevation of both rivers and mean topography. We show that the location of the Main Frontal Thrust is mainly controlled by the low erodability of the unconsolidated sandstone in the Siwaliks Hills. As previously suspected (Burbank et al. 2003), our simulations demonstrate that the pattern of uplift in Nepal is mainly dependent on both erodability and fault geometry, rather than on rainfall distribution.

Domains

Geomorphology

Dates and versions

hal-01543331 , version 1 (20-06-2017)

Identifiers

Cite

Vincent Godard, Jérome Lavé, Rodolphe Cattin. Numerical modelling of erosion processes in the Himalayas of Nepal: effects of spatial variations of rock strength and precipitation. The Geological Society, London, Special Publications, 2006, 253 (1), pp.341-358. ⟨10.1144/GSL.SP.2006.253.01.18⟩. ⟨hal-01543331⟩
328 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More