Experimental bed active-layer survey with active RFID scour chains: Example of two braided rivers (the Drac and the Vénéon) in the French AlpsGuillaume Brousse, Frédéric Liébault, Gilles Arnaud-Fassetta and Daniel Vazquez-TarrioE3S Web Conf., 40 (2018) 04016DOI: https://doi.org/10.1051/e3sconf/20184004016