Discussion of “Understanding the influence of slope on the threshold of coarse grain motion: Revisiting critical stream power” by C. Parker, N.J. Clifford, and C.R. Thorne Geomorphology, Volume 126, March 2011, Pages 51-65

This paper presents a discussion of Parker et al. (2011). In particular, some theoretical developments are presented that give additional material to apprehend the effects of grain size, water depth and slope on the critical Shields parameter and critical stream power.