Channel hydraulics data and grain sizes of the seven studied rivers in the Qilian Shan.docx

From the fan apex to the distal end, our field investigations included measurements of channel geometry, channel gradient, sediment grain size, and geomorphic characteristics along the channel. The channel gradient for each channel was calculated from the longitudinal profiles obtained from the SRTM DEM (30-m resolution). The depths were obtained by averaging the values measured at 1-m intervals across the bank-full channels. Grain sizes were measured by pebble counting (Wolman, 1954), based on 100 stochastically selected pebbles on the active channel bed.