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Earth Surface Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 5, issue 1
Earth Surf. Dynam., 5, 125–143, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Earth Surf. Dynam., 5, 125–143, 2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 21 Feb 2017

Research article | 21 Feb 2017

Autogenic versus allogenic controls on the evolution of a coupled fluvial megafan–mountainous catchment system: numerical modelling and comparison with the Lannemezan megafan system (northern Pyrenees, France)

Margaux Mouchené et al.
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Cited articles  
Abrahami, R.: Erosion et flux sédimentaires associés dans un bassin versant soumis à un régime de mousson: l'exemple de la Tista (Inde), du Sikkim au Mégafan, PhD Thesis, Université de Grenoble, 223 pp. 2015.
Abrams, M. J. and Chadwick, O. H.:Tectonic and climatic implications of alluvial fan sequences along the Batinah coast, Oman, J. Geol. Soc. Lond., 151, 51–58, 1994.
Allen, P. A., Armitage, J. J., Carter, A., Duller, R. A., Michael, N. A., Sinclair, H. D., Whitchurch, A. L., and Whittaker, A. C.: The Qs problem: Sediment volumetric balance of proximal foreland basin systems, Sedimentology, 60, 102–130, 2013.
Arboleya, M.-L., Babault, J., Owen, L. A., Teixell, A., and Finkel, R. C.: Timing and nature of Quaternary fluvial incision in the Ouarzazate foreland basin, Morocco, J. Geol. Soc. Lond., 165, 1059–1073, 2008.
Assine, M. L., Corradini, F. A., do Nascimento Pupim, F., and McGlue, M. M.: Channel arrangements and depositional styles in the São Lourenço fluvial megafan, Brazilian Pantanal wetland, Sediment. Geol., 301, 172–184, 2014.
Publications Copernicus
Short summary
The Lannemezan megafan (northern Pyrenean foreland) was abandoned during the Quaternary and subsequently incised. We use numerical models to explore possible scenarios for the evolution of this megafan. We show that autogenic processes are sufficient to explain its evolution. Climate may have played a second-order role; in contrast base-level change, tectonic activity and flexural isostatic rebound do not appear to have influenced its evolution.
The Lannemezan megafan (northern Pyrenean foreland) was abandoned during the Quaternary and...