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Our studies have been directed towards determination of surface erosion rates at various scales (temporal and spatial) and at different climatic conditions, and towards understanding the response of drainage network systems in mountain belts to tectonic forcing and climate change, and to variations in exposed source rock lithologies.
Research on the analysis of possible controls on the evolution of drainage network systems was carried out using numerical models. The model results suggest that a climate change results in a topographic growth or decay of a mountain belt, but not in a modification of the drainage pattern.
Our most recent studies have been directed towards a quantification of surface erosion in the Andes of Chile and Peru, and in the Alps of Switzerland using photogrammetric techniques, low-temperature thermo-chronometers, cosmogenic nuclide analyses and sediment discharge data that is interpreted in terms of sediment yields and erosion rates. These quantitative datasets have been combined with geomorphic and geologic information from the field to interpret possible controls on the calculated patterns of sediment yields. The results imply that the erosional efficiency in watersheds is enhanced if the downslope flux of mass is balanced by sediment transport in channels, It appears, however, that this balance crucially depends on climatic conditions. Indeed, field studies carried out in Northern Chile combined with cosmogenic nuclide analyses imply that a change towards more arid climatic conditions (which appears to be the trend of modern global climate) tends to shift erosional processes to a weathering-limited stage, which, in turn, has promoted fluvial dissection and topographic roughness.
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Marine Prieur, Rocio Jaimes-Gutierrez, Amanda Wild,Cecile Robin,Alexander Whittaker,Jean Braun,Charlotte Fillon,Fritz Schlunegger, Tor Somme,Sebastien Castelltort
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EARTH SURFACE PROCESSES AND LANDFORMSno. 3 (2024): 1099-1116
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Sofia Garipova,David Mair, Sophia Demmel, Ludovico Agostini,Naki Akçar,Peter Molnar,Fritz Schlunegger
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