The project is organized in 4 multidisciplinary work packages: experimental, numerical, image analysis and management and multiscale analysis, investigating at interconnected scales. WP1 is devoted to original experimental investigations. Starting from the inherent complexity of field measurements and analysis, the structure follows a downscaling path proposing 3D experiments with natural material, quasi 2D experiments with spherical glass beads and finally 2D dry granular experiments. WP2 follows an upscaling path from Euler/Lagrange models to shallow water engineering models including Euler/Euler and mixture models. Once validated on experimental results, process-based bedload transport models will also help interpret experimental findings at different scales. WP3 is entirely devoted to image analysis, especially particle tracking and segmenting algorithms. Open source sediment tracking algorithms and ground-truth datasets will be made available.