Supplementary material to "Model-based analysis of solute transport and potential carbon mineralization in a permafrost catchment under seasonal variability and climate change"

After surveying the subcatchment in Endalen valley by drone, we process the survey in the photogrammetrical suite Agisoft Metashape version 1.8.4 using the default processing settings.We register the survey data to the 2009 Digital Elevation Model (DEM) made by well-georeferenced aerial images by the Norwegian Polar Institute (Norwegian Polar Institute, 2014), using Iterative Closest Point (ICP) registration in CloudCompare version 2.12, leading to a mean vertical bias of 0.03 m, and a mean absolute point-to-point distance (which we consider the registration uncertainty) of 0.74 m.We assume minimal internal distortion in the survey due to the inclusion of oblique images (James et al., 2017) and therefore consider the affine transformation of the ICP registration sufficient for the accuracy that is required for the study.With a survey diameter of 990 m, this location uncertainty is approximately equivalent to an angle uncertainty of 0.04 • (tan -1 0.74 990 ).