Estimating uplift rate and erodibility from the area-slope relationship: Examples from Brittany (France) and numerical modelling |
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| Institution: | 1. Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou 310058, China;3. Division of Geological and Planetary Sciences, California Institute of Technology, CA 91125, USA;4. Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;5. Second Monitoring and Application Center, China Earthquake Administration, Xi''an 710054, China;1. LIENSs, ULR - CNRS, 2 rue Olympe de Gouges, 17000 La Rochelle, France;2. BRGM, 3 Avenue Claude Guillemin, 45060 Orléans Cedex, France;3. IMEDEA, UIB-CSIC, 07190 Esporles, Spain;4. LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, France |
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| Abstract: | We used the local slope/drainage area relationship to derive the basic erosion and tectonic parameters from a topography. Assuming a dynamic equilibrium between uplift and erosion, this relationship is expected to depend quite simply on the rock erodibility, and on the tectonic uplift. This relationship may then be used to quantify independently the effect of lithological variation on the erodibility, and the uplift rate. We tested the method on a computer simulated topography and showed that the uplift information can be precisely calculated from the topographic analysis alone. We then analysed the topography of Brittany (France), and obtained a good agreement with uplift data from comparative levelling studies and river incision analysis. |
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