Determination of erodibility or sediment ability of river reaches using three methods of fortier, Mavis and Hjulstrom (Case Study: Sirvan Basin, Kurdestan – Iran) Journal title: Journal of Biodiversity and Environmental Sciences (JBES) Authors: Amir Khosrojerdi, Nooshin Mohammadzadeh, Amirpouya Sarraf Subject(s): Biological Sciences, Environmental Sciences, Biology