The importance of threshold in alluvial river channel geometry and dynamics

Civil and Environmental Engineering, Utah State University Earth and Planetary Sciences, Washington University in Saint Louis School of Geography and the Environment, University of Oxford, Oxford, UK Earth, Environmental, and Planetary Sciences, Rice University Civil and Environmental Engineering, University of Florence Civil, Environmental and Architectural Engineering, University of Padua Earth and Environment, Franklin and Marshall College Universite de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005, Paris,