6/11/2023 0 Comments Gauss 2081 compression driverIn the coarse 2.5 cm fraction of bedload, only the uppermost size percentiles ( 95th) vary significantly downstream, whereas the 50th and 84th percentiles show less variability. Careful counting and validation allows us to identify measurement errors and constrain percentile uncertainties using large sample sizes. The study region traverses a steep topographic and environmental gradient on the eastern margin of the Central Andean Plateau. Using the recently published digital grain-sizing algorithm PebbleCounts, we were able to survey seven large ( 1,000 ) channel cross-sections and measure thousands to tens-of-thousands of grains per survey along a 100-km stretch of the trunk stream of the Toro Basin in Northwest Argentina. ![]() However, collecting hundreds to thousands of pebble measurements in steep and dynamic high-mountain river settings remains challenging. Thus, grain-size data are imperative for studying these processes. Mixed sand- and gravel-bed rivers record erosion, transport, and fining signals in their bedload size distributions.
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