Roering et al. (2001) describe very careful and interesting experiments that beautifully illustrate the transition from steady downhill creep at low gradients to highly dynamic transport on steep slopes. They interpret this behavior in terms of a single nonlinear diffusion coefficient, suggesting that transport on steep and gentle slopes is governed by common underlying physics. However, Figure 2A of Roering et al. (2001) shows that there is a transition from a state of mostly continuous flux on gentle slopes, to strongly pulsed behavior with avalanches on steep slopes. It does not seem adequate to describe transport on steep slopes by...

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