Development and validation of sinkhole susceptibility models in mantled karst settings. A case study from the Ebro valley evaporite karst (NE Spain) - Galve, J.P; Bonachea, J.; Remondo, J.; Gutiérrez, F.; Guerrero, J.; Lucha, P.; Cendrero, A.; Gutiérrez, M.; Sánchez, J.A