Data supporting: Interseasonal persistence of an englacial channel in a mountain valley glacier. interactive_features_all_surveys.htmlThis file shows a 3d view of the glacier surface of 2023 and the interpolated bedrock (Ordinary Kriging) from the July 2025 recordings. The observed features of the three surveys (April 2025, July 2025, March 2026) are on display. GPR April 2025In folder ASCII, there are the files DAT_0116_A1, DAT_0117_A1, DAT_0120_A1, DAT_0125_A1, DAT_0126_A1, DAT_0129_A1, DAT_0130_A1 which are the GPR acquisition lines recorded on Hintereisferner. They are readable in ReflexW (sandmeier-geo.de), can be processed with provided Sequence Processing Flow. In LINEDATA, the picked bedrock and features can be found to be opened in ReflexW. GPR July 2025In folder ASCII, there are the files DAT_0146_A1, DAT_0147_A1, DAT_0148_A1, DAT_0149_A1, DAT_0150_A, which are the GPR acquisition lines recorded on Hintereisferner. They are readable in ReflexW, can be processed with provided Sequence Processing Flow. In LINEDATA, the picked bedrock and features can be found to be opened in ReflexW. GPR March 2026This dataset is acquired with another radarsystem than April and July 2025 and therefore provided in folder PROCDATA. There are the files LINE__4.03 (without GPS coordinates), LINE__6.04 with coordinates in folder ASCII, LINE__08.04 (without coordinates). Readable in ReflexW, can be processed with provided Sequence Processing Flow. In folder LINE6__profiles, the LINE6 profiles with the respective coordinate files can be found. In LINEDATA, the picked bedrock and features can be found to be opened in ReflexW. Ice surface velocitiesCoordinates of the four surface displacement points and the surface displacement velocities provided by the NASA MEaSUREs ITS_LIVE project using data between August 2013 and April/May 2025 for time intervals of <=30 days. (Gardner, A. S., M. A. Fahnestock, and T. A. Scambos, 2019 [update to time of data download]: MEaSUREs ITS_LIVE Landsat Image-Pair Glacier and Ice Sheet Surface Velocities: Version 1. Data archived at National Snow and Ice Data Center. https://doi.org/10.5067/IMR9D3PEI28U) Ice thicknessesIce thicknesses for all three surveys on Hintereisferner (April 2025, July 2025, March 2026). The coordinate system is WGS84 UTM zone 32. The Z_surf values are from a DEM from the HEFEX II campaign in 2023 (Nicholson et al. 2025). FeaturesThe coordinates and the depths of the observed features for all three surveys on Hintereisferner (April 2025, July 2025, March 2026). The coordinate system is WGS84 UTM zone 32. The Z_surf values are from a DEM from the HEFEX II campaign in 2023 (Nicholson et al. 2025). Modelling dataWithin the folder modelling_data, the used input data and the instructions on how to reproduce the subglacial hydrological channels modelled for this study can be found.