Evaluation of a gully headcut retreat model using multitemporal aerial photographs and digital elevation models
Fecha
2013Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
|
10.1002/jgrf.20147
Resumen
A large fraction of soil erosion in temperate climate systems proceeds from gully
headcut growth processes. Nevertheless, headcut retreat is not well understood. Few erosion
models include gully headcut growth processes, and none of the existing headcut retreat
models have been tested against long-term retreat rate estimates. In this work the headcut
retreat resulting from plunge pool erosion ...
[++]
A large fraction of soil erosion in temperate climate systems proceeds from gully
headcut growth processes. Nevertheless, headcut retreat is not well understood. Few erosion
models include gully headcut growth processes, and none of the existing headcut retreat
models have been tested against long-term retreat rate estimates. In this work the headcut
retreat resulting from plunge pool erosion in the Channel Hillslope Integrated Landscape
Development (CHILD) model is calibrated and compared to long-term evolution
measurements of six gullies at the Bardenas Reales, northeast Spain. The headcut retreat
module of CHILD was calibrated by adjusting the shape factor parameter to fit the observed
retreat and volumetric soil loss of one gully during a 36 year period, using reported and
collected field data to parameterize the rest of the model. To test the calibrated model,
estimates by CHILD were compared to observations of headcut retreat from five other
neighboring gullies. The differences in volumetric soil loss rates between the simulations
and observations were less than 0.05 m3 yr-1, on average, with standard deviations smaller
than 0.35 m3 yr-1. These results are the first evaluation of the headcut retreat module
implemented in CHILD with a field data set. These results also show the usefulness of the
model as a tool for simulating long-term volumetric gully evolution due to plunge
pool erosion. [--]
Materias
Gully headcut retreat,
Channel Hillslope Integrated Landscape Development (CHILD) model
Editor
American Geophysical Union Wiley
Publicado en
Journal of Geophysical Research: Earth Surface, vol. 118, 2159–2173
Departamento
Universidad Pública de Navarra. Departamento de Proyectos e Ingeniería Rural /
Nafarroako Unibertsitate Publikoa. Landa Ingeniaritza eta Proiektuak Saila
Versión del editor
Entidades Financiadoras
This work was made possible by financial support from the Spanish Ministry of Science and Technology, through the research project CGL2007-63453/HID, the Department of Education of the Government of Navarra, and the Public University of Navarra, with a fellowship awarded to the first author. CHILD development was supported by the U.S. Army Research Office (agreement DAAD 19-01-1-0513) and through the NSF grant (EAR 0642550).