Effects of slope processes and management in gullying
Fecha
2007Versión
Acceso abierto / Sarbide irekia
Tipo
Contribución a congreso / Biltzarrerako ekarpena
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
|
nodoi-noplumx
|
Resumen
Most erosion studies have been typically done in rill and
interrill areas because the complexity of gullies and their
large size have made their study very difficult.
Morgan (1979) and Hudson (1985) define gullies as
water courses with very steep walls that are submitted to
spasmodic flows during storms. More recently, permanent
gullies are defined as channels too deep to be ameliorated
with ordi ...
[++]
Most erosion studies have been typically done in rill and
interrill areas because the complexity of gullies and their
large size have made their study very difficult.
Morgan (1979) and Hudson (1985) define gullies as
water courses with very steep walls that are submitted to
spasmodic flows during storms. More recently, permanent
gullies are defined as channels too deep to be ameliorated
with ordinary farming tools (Soil Science Society of
America, 2001; Poesen et al., 2003). Gullies range from 0.5
m to up 25-30 m depth.
FAO (1978) indicates that gully evolution takes place by
means of several processes, which can act together or
separately. Schnabel (1997) points out that the main processes
on gully erosion are headcut retreat, channel deepening,
undermining and scouring. Bull and Kirkby (2002) and
Poesen et al., (2002) show that most gullies expand by headcut
retreat and sidewall retreat. In our study area there is piping as
another important process on gully erosion (Desir et al., 2005;
Desir and Marín, 2006). Piping has been described as one of
te most important process acting on dispersive clays
(Martínez-Casanovas et al., 2004). In our study 7area where
dispersive clays are common gullies reach a great extension.
To know and understand the way in which each processes
interact can help us to explain the landform and which factors
influence on the origin and evolution of gullies. Having two
different behaviours related to slope exposure as it is the case,
it is possible to highlight the differences in morphology,
development and processes involved. To reach this objective
piping, slope and thickness have been measured on both
slopes between more than 90 gully heads although only the
most representative piping areas have been represented. [--]
Materias
Piping,
Slopes,
Gully erosion
Editor
Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
Publicado en
Javier Casalí, Rafael Giménez (eds.): Progress in Gully Erosion Research. IV International Symposium on Gully Erosion. September 17-19, 2007. Pamplona, Spain. Pamplona: Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007
Notas
Resumen del trabajo presentado al IV International Symposium on Gully Erosion, celebrado en la Universidad Pública de Navarra del 17 al 19 de septiembre de 2007.