The STREAM research project (2017-2021) aims at leveraging expertise in karst dye tracing, hydrogeology, hardware/software engineering and instrumentation to develop a compact and easy-to-use field fluorometer for hydrogeology with focus to karst and complex environments.
First prototype of this tool was presented at the 2018 Eurokarst conference in Neuchatel. Since those developments, a multidisciplinary program gathering hydrogeologists, cavers and engineers successfully develops, tests and validates a professional tool. The STREAM field fluorometer is a compact (1,25 kg, 23x6cm) standalone probe, including optical probe, internal battery and data logger in the same casing. The tool is 100% submersible since it was designed to be easily installed in challenging environments, possibly flooded or under pressure (pipes networks…), field test validates a -800m depth rating. The fluorometer was successfully tested in field conditions with 3 fluorescent dyes (sodium fluorescein, sulforhodamin B, amino-g acid), in addition to turbidity and temperature (all parameters can be measured at each timestep). A user-interface is embedded so no additional software is required for configuration, data visualisation/download or calibration.
Data from the three last years of the STREAM project are presented, mainly in Belgium karst systems. The focus will be on the development choices, field performances of the instrument, its advantages and limitations for various use-cases. Future challenges and perspectives for research projects based on the STREAM fluorometer will be addressed.