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To determine possible controls on sediment grain properties, 21 coastal rivers located along the entire western Peruvian margin\udwere analysed.\udThis represents one of the largest grain size dataset that has been\udcollected over a large area. Modern gravel beds were sampled along a\udnorth–south transect on the western side of the Peruvian Andes where the\udrivers cross the tip of the mountain range, and at each site the long\uda axis and the intermediate b axis of about 500 pebbles were measured.\udMorphometric properties of each drainage basin, sediment and water discharge,\udtogether with flow shear stresses, were determined and compared against\udmeasured grain properties. Pebble size data show that the values for the\udD50 are nearly constant and range between 2 and 3 cm, while the values of\udthe D96 range between 6 and 12 cm. The ratios between the intermediate\udand the long axis range from 0.67 to 0.74. Linear correlations between all\udgrain size percentiles and water shear stresses, mean basin denudation\udrates, mean basin slopes and basin sizes are small to non-existent. However,\udexceptionally large D50 values of 4–6 cm were measured for basins\udsituated between 11–12 and 16–17° S latitude where\udhillslope gradients are steeper than on average or where mean annual\udstream flows exceed the average values of the western Peruvian streams by a\udfactor of 2. We suggest that the generally uniform grain size pattern has\udbeen perturbed where either mean basin slopes or water fluxes exceed\udthreshold conditions

Possible threshold controls on sediment grain properties of Peruvian coastal river basins