Author(s): Francesco Alongi; Carmelo Nasello; Calogero Mattina; Dario Pumo; Leonardo Valerio Noto
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Abstract: In recent decades, river monitoring field has experienced a strong impulse thanks to the widespread use of non-intrusive discharge measurement methods. Radar- and image-based techniques can face and address typical issues arising from the adoption of traditional measurement approaches; for instance, they are suitable also in dangerous situations, such as floods, since they do not require direct contact between instruments, personnel, and water flow. Simplicity in the use of instruments and availability of free open-source processing software, make non-conventional discharge measurements reliable, easy, and fast, compared to traditional approaches. Radar instruments are based on Doppler effect for the evaluation of the velocity of floating matter over the liquid surface, by calculating the delay between emitted and reflected signals. Image-based techniques exploit cheap and easy-to-use recording devices and floating tracer for tracking river surface motion, statistically reconstructed by frame-by-frame cross-correlation analysis. Both radar- and image-based techniques use the velocity-area method for river discharge assessment. The bathymetry along a transect must be known, and the depth-averaged velocity is usually obtained by adopting simplifying assumption on the vertical velocity distribution. A velocity coefficient
Year: 2024