“…Gully erosion rates were reconstructed by Malik (2006Malik ( , 2008 and Moravska, Wronska-Walach (2012), but these studies focused exclusively on the active floors of large, stabilized gullies. Stoffel et al (2012), Bodoque et al (2011), Chartier et al (2016), Šilhán, Ružek, Burian (2016) and Šilhán et al (2016) reconstructed erosion rates on the sides of gullies, but linear (i.e. the distance along the slope over which the gully head retreated per unit of time) and areal (areal expansion of the gully over time; Frankl et al 2012;Vanmaercke et al 2016) gully headcut retreat (GHR) were not determined.…”