Sediment yield from irregularly shaped gullies located on the Fortuna lithologic formation in semi-arid area of Tunisia

Gully erosion susceptibility assessment by means of GIS-based logistic regression: A case of Sicily (Italy)

“…Recent articles reported that reliable estimations of ephemeral gully volumes can be simply obtained by assessing their lengths, while weak predictions are provided by the EGEM (Nachtergaele et al, 2001a, b;Capra et al, 2005). Further investigations confirmed that empirical relationships between eroded volume and channel length can be established for linear erosional landforms of different sizes including rills, ephemeral and permanent gullies, and badland channels (Bruno et al, 2008;Capra et al, 2009;Di Stefano and Ferro, 2011;KompaniZare et al, 2011;Caraballo-Arias et al, 2013;El Maaoui et al, 2012).…”

“…Volume and velocity of concentrated flow are controlled by topographic attributes such as contributing drainage area, slope curvature and slope steepness (Moore et al, 1988;Vandekerckhove et al, 1998Vandekerckhove et al, , 2000aPoesen et al, 2003;Valentin et al, 2005;Zucca et al, 2006;Gómez Gutiérrez et al, 2009a, b;Kakembo et al, 2009;Nazari Samani et al, 2009;Capra et al, 2012;Svoray et al, 2012;Chaplot, 2013;Conoscenti et al, 2013). Depth and cross-sectional morphology of gullies are regulated by erodibility of soil horizons (Ireland et al, 1939;Imeson and Kwaad, 1980;Poesen et al, 2003) and characteristics of geological substrata (Vandekerckhove et al, 2000a;Zucca et al, 2006;Conoscenti et al, 2008;Conforti et al, 2010;Lucà et al, 2011;Marzolff et al, 2011;El Maaoui et al, 2012). Moreover, soil properties influence sub-surface flow and occurrence of piping phenomena, which can generate gullies when roofs of pipes collapse (Bocco, 1991;Bull and Kirkby, 1997;Bryan and Jones, 2000;Martínez-Casasnovas et al, 2004;Valentin et al, 2005;Pulice et al, 2012).…”

Planar morphology and controlling factors of the gullies in the Yuanmou Dry-hot Valley based on field investigation

“…Within a specific area, the length of the rill, ephemeral gully or permanent gully usually tends to be concentrated within a certain range Kostaschuk, 1995, 1997;Zhang et al, 2007;Hobbs et al, 2013) and to follow a certain statistical distribution (Cheng et al, 2007); however, there may be great differences in length among different areas (Adediji et al, 2013). The gully length is easily interpreted with aerial photos or satellite photos, and it is thus usually used as the best parameter for estimating erosion volume (Nachtergaele and Poesen, 1999;Nachtergaele et al, 2001;Capra et al, 2005;Cheng et al, 2006;Bouchnak et al, 2009;Capra et al, 2009;El Maaoui et al, 2012;Frankl et al, 2013;Hobbs et al, 2013), and becomes an important index for understanding and evaluating the severity of erosion of the rill or gully (Casalı́ et al, 1999;Nachtergaele et al, 2001;Cheng et al, 2006). There is usually a power law relationship between the erosion volume of a rill or a gully and the length (Capra et al, 2009); and the relationship is correlated not with the channel type but with a different scale factor that exists for these two forms of erosion (rill and ephemeral gully) (Capra et al, 2009).…”

Morphometric and hydraulic geometry assessment of a gully in SW Spain

“…Gully erosion studies have used simple empirical equations for analyzing the morphometric and hydraulic characteristics of gullies (Nachtergaele et al, 2001a(Nachtergaele et al, , 2001b(Nachtergaele et al, , 2002Capra et al, 2005Capra et al, , 2009Bruno et al, 2008;Di Stefano and Ferro, 2011;Kompani-Zare et al, 2011;El Maaoui et al, 2012;Di Stefano et al, 2013;Frankl et al, 2013;Caraballo-Arias et al, 2014). Since gully erosion processes are often considered similar to those occurring in other types of channelized water flows, many of the empirical equations used for gully erosion assessment have their origins in rills, streams or rivers.…”