Temps de réponse de l'érosion glaciaire

Séminaire le 05 mai 2017 de 10h00 à 11h30

Intervenant : Frédéric Herman

Associate Professor

Institue of Earth Surface Dynamics, Université de Lausanne, Géopolis

Salle Pyrénées Salle Pyrénées

"Assessing the impact of glaciation on Earth’s surface requires understanding glacial erosion processes. Developing erosion theories is challenging because of the complex nature of the erosion processes and the difficulty of examining the ice/bedrock interface of contemporary glaciers. We demonstrate that the glacial erosion rate is proportional to the ice-sliding velocity squared, by quantifying spatial variations in ice-sliding velocity and the erosion rate of a fast-flowing Alpine glacier. The nonlinear behavior implies a high erosion sensitivity to small variations in topographic slope and precipitation. A nonlinear rate law suggests that abrasion may dominate over other erosion processes in fast-flowing glaciers. It may also explain the wide range of observed glacial erosion rates and, in part, the impact of glaciation on mountainous landscapes during the past few million years."

Science  09 Oct 2015:
Vol. 350, Issue 6257, pp. 193-195
DOI: 10.1126/science.aab2386

Powered by eZ Publish™ CMS Open Source Web Content Management. Copyright © 1999-2012 eZ Systems AS (except where otherwise noted). All rights reserved.