171 ADCP gaugings from 45 teams during the Sault-Brénaz regatta (France, November 2023)

The moving-boat ADCP regatta organized by Groupe Doppler Hydrométrie on November 15, 2023 attracted over 130 participants. They were divided in 45 teams from various European countries (Germany, France, Great Britain, Luxembourg, Poland, Slovakia, Sweden, Czech Republic). This intercomparison enabled 57 ADCP to be tested on a straight channel near the Rhône at Sault-Brénaz. They carried out nearly 170 ADCP gaugings over the course of four sessions spread throughout the day: two in the morning (S1a and S1b) and two in the afternoon (S2a and S2b). Mean measured discharge was 2.1 m3/s for a velocity close to 40 cm/s. The Sault-Brénaz canal is 8 meters wide and almost a meter deep, with little vegetation, clear water and a steady flow, providing favorable conditions for ADCP measurements. Teams were advised to post-process their measurements with QRevInt 1.18. Users were free to select settings that seemed appropriate to them (navigation reference bottom track or GPS, extrapolation method/exponent, distance to the banks). This experiment allows to test the proper calibration of ADCPs and also to identify sources of error in these measurement conditions. Data is divided into 4 folders corresponding to the sessions. Subfolders are named according to the convention Session_Team_Section_Model of each ADCP measurement. Each sub-folder corresponds to a team measurement during a session and contains ADCP raw data. File extension is *.mmt for Teledyne RD instruments and *.mat for Xylem - SonTek instruments. Raw ADCP file can be opened with QRevInt software (https://www.genesishydrotech.com/qrevint). ADCP dataset can be processed with QRame software (https://gdh-hydrometrie.org/boite-a-outils/logiciels/qrame-2/)