Assessing coastal vulnerability index of tourism site: the case of Mataram Coast Aninda W. Rudiastuti, Ati Rahadiati, Ratna S. Dewi, Dewayany Soetrisno and Erwin Maulana E3S Web Conf., 153 (2020) 03002 Published online: 17 February 2020 DOI: 10.1051/e3sconf/202015303002