In this study, the medium-term evolution of some erosion channels (ephemeral gullies, EGs) initiated in a wheat-cultivated area on silty-clay-loam soils in central Sicily (Italy) in 1995 was studied over 18 years. The studied EGs showed a cyclic behaviour. They appeared during the rainy season, were erased from July to October by soil infill from areas adjacent to the channel using ordinary tillage equipment, and, in most years, they reappeared in the same position during the following rainy season. Between 1995 and 2013, some field surveys were conducted to measure the channel dimensions (length, depth, width, surface area and volume). The channel size evolved over time. The depth and width increased from 76% to 90% in different EGs, reaching a depth greater than 1 m and an upper width greater than 2 m. These dimensions interfere with conventional tillage operations, and farmers suspend their efforts to fill in the channels. At the same time, the study showed that the EG length increased until almost 2006 and decreased in more recent years due to natural infilling beginning in the downstream area of the watersheds where the gradient is less. The average infilling rate ranged from 1.1 to 4.3 m year-1. The results, on the whole, show how, once formed, EGs evolve towards permanent channels (gullies) and then can be naturally filled if the soil management system and precipitation regime are invariant.

Medium-term evolution of some ephemeral gullies in Sicily (Italy)

CAPRA, ANTONINA
Membro del Collaboration Group
;
2015

Abstract

In this study, the medium-term evolution of some erosion channels (ephemeral gullies, EGs) initiated in a wheat-cultivated area on silty-clay-loam soils in central Sicily (Italy) in 1995 was studied over 18 years. The studied EGs showed a cyclic behaviour. They appeared during the rainy season, were erased from July to October by soil infill from areas adjacent to the channel using ordinary tillage equipment, and, in most years, they reappeared in the same position during the following rainy season. Between 1995 and 2013, some field surveys were conducted to measure the channel dimensions (length, depth, width, surface area and volume). The channel size evolved over time. The depth and width increased from 76% to 90% in different EGs, reaching a depth greater than 1 m and an upper width greater than 2 m. These dimensions interfere with conventional tillage operations, and farmers suspend their efforts to fill in the channels. At the same time, the study showed that the EG length increased until almost 2006 and decreased in more recent years due to natural infilling beginning in the downstream area of the watersheds where the gradient is less. The average infilling rate ranged from 1.1 to 4.3 m year-1. The results, on the whole, show how, once formed, EGs evolve towards permanent channels (gullies) and then can be naturally filled if the soil management system and precipitation regime are invariant.
Ephemeral gully erosion; gully filling; Mediterranean wheat areas
File in questo prodotto:
File Dimensione Formato  
Capra_2015_STILL_Medium_term_editor.pdf

non disponibili

Descrizione: versione editoriale
Tipologia: Versione Editoriale (PDF)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.47 MB
Formato Adobe PDF
1.47 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Capra_2015_STILL_Medium_term_post.pdf

embargo fino al 31/12/2017

Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 1.26 MB
Formato Adobe PDF
1.26 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/1644
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 25
  • ???jsp.display-item.citation.isi??? 22
social impact