Caroline Le Bouteiller, Univ. Grenoble Alpes, IRSTEA UR ETNA, Saint Martin D'Heres, France, Alexandra Carriere, Univ. Grenoble Alpes, IRSTEA UR ETNA, Saint Martin d'Heres, France, Gregory E Tucker, Univ Colorado, Boulder, CO, United States and Mohamed Naaim, IRSTEA, Antony, France