Passive acoustic inversion to estimate bedload size distribution in rivers
Résumé
The main subject of our research is the analysis of quality of water in rivers by measuring the bedload transport. The bedload transport is defined by a particle moving close to the river bed, by sliding, saltation and rolling. We have adopted the Passive Acoustic Monitoring to listen to the river soundscape using a submerged hydrophone. These sources are due to surface waves, to turbulence and to inter-particular collisions. Inter-particular collision is the noise that we study because it is generated by the bedload phenomenon. In this study, we developed a Least Square procedure to inverse the spectra of noise recorded. The result represents an estimation of the transported grain size distribution.