Hydrodynamic interpretation of a boulder berm and associated debris-torrent deposits |
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| Authors: | PA Carling |
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| Institution: | 1. IRSTEA, UR GERE, 17 avenue de Cucillé, CS 64427, F-35044 Rennes, France;2. Université Européenne de Bretagne, France;2. Climate Change an Climate Impacts (C3i) Institute for Environmental Sciences, University of Geneva, 66 Boulevard Carl-Vogt, CH-1205 Geneva, Switzerland;3. Department of Earth Sciences, University of Geneva, 13 rue des Maraîchers, CH-1205 Geneva, Switzerland;4. Centre National de la Recherche Scientifique (CNRS) UMR6042 Geolab, 4 rue Ledru, F-63057 Clermont-Ferrand Cedex, France;5. Institute for Alpine Hazards, University of Natural Resources and Life Sciences, Vienna (BOKU), A-1190 Vienna, Austria;6. University of Graz, Wegener Center for Climate and Global Change (WegCenter), A-8010 Graz, Austria;7. Central Office for Meteorology and Geodynamics (ZAMG), A-1190 Vienna, Austria;8. Austrian Institute of Economic Research, A-1030 Vienna, Austria |
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| Abstract: | The hydrodynamic environment associated with a boulder berm is reconstructed from the geometry and sedimentology of the berm and associated debris-torrent deposits. Berms may result from a variety of hydrodynamic scenarios but in this instance the berm was associated with flow separation downstream of an abrupt change in channel morphology. Sediment fabric analyses are summarized particularly as eigenvalues and these data compared with the fabric of debris flows and clear-water gravel deposits. Although data are few, the eigenvalue results can be interpreted consistently as reflecting a transition between the end members of a sediment fabric continuum.The value of detailed studies of berm geometry and sedimentology is discussed with reference to their hydraulic significance. This latter aspect is important for palaeo-discharge reconstruction of both Newtonian and non-Newtonian flows. |
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