Streamflow record from Vallon de Nant

Streamflow record from Vallon de Nant (outlet at 46.25301◦ N, 7.10954◦ E in WGS84; elevation 1200 m a.s.l.) As used in paper: Michelon, A., Ceperley, N., Beria, H., Larsen, J., Vennemann, T., & Schaefli, B. (2023). Hydrodynamics of a high Alpine catchment characterized by four natural tracers. Hydrology and Earth System Sciences, 27(7), 1403–1430. https://doi.org/10.5194/hess-27-1403-2023. Files: 1) river_Qexp_filtered_ex.csv (from start of measurement, as shown in the figures of the above paper, with the addition of the short time series from 2015): starts: '19-Nov-2015 11:00:00' ends: '24-Sep-2018 06:49:00' time step: 1 minute units: mm/day (specific discharge) columns (7): 'Year', 'Month', 'Day', 'Hour', 'Minute', 'Second', 'Q [mm/day]' Note:Time series regularized according to the lowest time step, to overcome variability in instrument timestep. 2) Q_VdN_05-Jun-2025.csv - more complete data set, but with minimum quality control. starts: 08-Sep-2015 23:00:00 ends: '05-Jun-2025 09:31:00' time step: 1 minute units: m3/s, m, °C, uS/cm columns (6): Time, observed discharge Q_experimental [m^3/s], theoretical discharge Q_theoretical [m^3/s], water stage H [m], water temperature [^°C] , conductivity [uS/cm], opacity datetime format: 'dd-MMM-uuuu HH:mm:ss'(uuuu = year) Note: Time series regularized according to the lowest time step, to overcome variability in instrument timestep. 'Q_experimental' calculated according to stage-discharge curve cited below. 'Q_theoretical' calculated as follows: Qth = Vcritic.*mu.*area; % [m3/s] Discharge based on trapezoidal weir where mu = 0.55/(1/sqrt(3)); % [-] reduction factor, according to Dieter Rickenmann area = height .* (5.3 + height); % [m2] width of weir, according to Guillaume Mayoraz Vcritic = sqrt(9.81 .* height); % [m/s] Salt Slug measurements and Stage Discharge curve reported in: Ceperley, N., Michelon, A., Escoffier, N., Mayoraz, G., Boix Canadell, M., Horgby, A., Hammer, F., Antoniazza, G., Schaefli, B., Lane, S., Rickenmann, D., & Boss, S. (2018). Salt gauging and stage-discharge curve, Avançon de Nant, outlet Vallon de Nant catchment (V1.0.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.1154798. (accessed 25 Jun., 2025). Additional description in PhD thesis: Michelon, A. (2021). Hydrologic processes analysis in a high Alpine catchment: The case of the Vallon de Nant [PhD]. University of Lausanne. https://serval.unil.ch/resource/serval:BIB_0C61AF744730.P002/REF.pdf (accessed 25 Jun., 2025). Detailed description of calibration and outlet measurement in: Mayoraz Guillaume (2018). Mesure du débit et du transport sédimentaire total dans un bassin versant des Alpes suisses. Sous la direction du Prof. Stuart Lane et du Dr Dieter Rickenmann. Mémoire de Master en géographie [Master]. https://igd.unil.ch/memoires/memoires/1504 (available upon request, website accessed 25 Jun., 2025). Data collected by the research team of Bettina Schaefli while at the Institute of Earth Surface Dynamics (IDYST), Faculty of Geosciences and Environment, University of Lausanne, Lausanne, 1015, Switzerland. Currently located at the Institute of Geography & Oeschger Centre for Climate Change Research, Hallerstrasse 12, 3012 Bern, Switzerland. Grant: SNSF PP00P2\_157611