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. We present field observations from coarse-grained streams in the Swiss Alpsand the Peruvian Andes to explore the controls on the probability ofmaterial entrainment. We calculate shear stress that is expected for a meanannual water discharge and compare these estimates with grain-specificcritical shear stresses that we use as thresholds. We find that theprobability of material transport largely depends on the sorting of the bedmaterial, expressed by the D96∕D50 ratio, and the reach gradient butnot on mean annual discharge. The results of regression analysesadditionally suggest that among these variables, the sorting exerts thelargest control on the transport probability of grains. Furthermore, becausethe sorting is significantly correlated neither to reach gradient nor towater discharge, we propose that the granulometric composition of thematerial represents an independent, yet important control on the motion ofclasts in coarse-grained streams.

earth surface dynamics

Short communication: Field data reveal that the transport probability of clasts in Peruvian and Swiss streams mainly depends on the sorting of the grains