This data publication supports the manuscript “Controls on Valley-Floor Width in the Western An-des” by Tofelde et al. (currently under review in the Journal of Geophysical Research: Earth Sur-face). The aim of the associated study is to quantify and compare the relative influence of four key factors—river discharge, tectonic uplift, bedrock strength, and lateral sediment supply from adja-cent hillslopes—on the width of valley floors.
Valley-floor width was systematically measured at more than 126,000 locations across 84 catch-ments spanning the western Andes between 5°S and 40°S. To represent the four hypothesized controls, eleven proxy variables were developed and analyzed (see Table 1 in the main manu-script). Valley-floor width was quantified using the approach of Clubb et al. (2022) implemented in the topography analysis software LSDTopoTools (Mudd et al., 2023). River steepness index (Wobus et al., 2006), a proxy for tectonic uplift, was also calculated in LSDTopoTools. All remaining proxies were quantified using the topography analysis software TopoToolbox (Schwanghart & Kuhn, 2010; Schwanghart & Scherler, 2014) implemented in Matlab with the script Valley_floor_analysis.m pro-vided here. This script reproduces the datasets used in the study and allows to apply the approach to new locations.