title: The impact of droughts and climate change on sinkhole occurrence. A case study from the evaporite karst of the Fluvia Valley, NE Spain.
abstract: This work introduces the concept that sinkhole frequency in some karst settings increases during drought periods. This conception is tested in a sector of the Fluvia River valley in NE Spain, where subsidence phenomena is related to the karstification of folded Eocene evaporite formations. In the discharge areas, the evaporites behave as confined aquifers affected by hypogene karstification caused by aggressive artesian flows coming form an underlying carbonate aquifer. A sinkhole inventory with chronological data has been constructed, revealing temporal clusters. Those clusters show a good correlation with drought periods, as revealed by precipitation, river discharge and piezometric data. This temporal association is particularly obvious for the last and current drought starting in 1998, which is the most intense of the record period (1940-present). Climatic projections based on recent studies foresee an intensification of the droughts in this sector of NE Spain, which could be accompanied by the enhancement of the sinkhole hazard and the associated risks.
authors.affiliation: Departamento de Geología, Universidad Autónoma de Barcelona, E-08193 Barcelona, Spain. Electronic address: rogelio.linares@uab.cat.
authors.forename: Rogelio
authors.initials: R
authors.lastname: Linares
authors.affiliation: Àrea de Geodinàmica Externa i Geomorfologia, Universitat de Girona, Campus Montilivi, E-17003 Girona, Spain.
authors.forename: Carles
authors.initials: C
authors.lastname: Roqué
authors.affiliation: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, C/. Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Gutiérrez
authors.affiliation: Departamento de Geología, Universidad Autónoma de Barcelona, E-08193 Barcelona, Spain.
authors.forename: Mario
authors.initials: M
authors.lastname: Zarroca
authors.affiliation: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, C/. Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Domingo
authors.initials: D
authors.lastname: Carbonel
authors.affiliation: Departamento de Geología, Universidad Autónoma de Barcelona, E-08193 Barcelona, Spain.
authors.forename: Joan
authors.initials: J
authors.lastname: Bach
authors.affiliation: Departamento de Ciencias de la Tierra, Universidad de Zaragoza, C/. Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: Ivan
authors.initials: I
authors.lastname: Fabregat
keywords: Evaporite karst; Global change; Hypogene karst; Sinkhole hazard management