Scouring-sedimentation balance for gully reaches affected by check dams in Mediterranean environments
Fecha
2007Versión
Acceso abierto / Sarbide irekia
Tipo
Contribución a congreso / Biltzarrerako ekarpena
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
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nodoi-noplumx
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Resumen
Many of the geomorphological impacts caused by check
dams are usually fairly common in torrential channels (bed
agradation upstream into the sedimentary wedges,
deepening and narrowing of the bankfull channel
downstream, etc). Nevertheless, the extent of these impacts
and consequently the degree of effectiveness of the crossstructures
is very different depending on the environmental
characteristi ...
[++]
Many of the geomorphological impacts caused by check
dams are usually fairly common in torrential channels (bed
agradation upstream into the sedimentary wedges,
deepening and narrowing of the bankfull channel
downstream, etc). Nevertheless, the extent of these impacts
and consequently the degree of effectiveness of the crossstructures
is very different depending on the environmental
characteristics of the catchments and on the hydrological
rectification systems (spatial distribution of check dams,
location, number and type of work). A clear indicator of
such an influence is the channel response to the deficit and
overfeeding of sediments (Brandt, 2000; Lenzi et al., 2003;
Marion et al., 2006; Comiti et al., 2005). In such a way, this
study has as its objective to show the influence of staggered
check dams of gabions on the scouring-sedi-mentation
balance in Mediterranean ephemeral gullies submitted to
Projects of Hydrological Forest Restoration (PHFR).
For areas of study, two semiarid gullied catchments with a
strong tendency to dry up have been chosen: Torrecilla and
Cárcavo catchments (South-east Spain). The Torrecilla
catchment (15.5 km2) shows a gullied area develo-ped on
metamorphic materials (slates, phyllites, schists and
quartzites), while the Cárcavo catchment (34.8 km2) is
drained by ephemeral channels and gullies that dissect deeply
the Miocene marls and Quaternary pediments. The
hydrological rectification projects undertaken are similar in
both catchments: 33 and 40 check dam series were constructed
respectively during the 1970s, the majority of them
with gabions. [--]
Materias
Checkdams
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.