High resolution quantification of gully erosion in upland peatlands at the landscape scale

Auteur(s) et Affiliation(s)

EVANS, M.

Upland Environments Research Unit, School of Environment and Development, Univ., Manchester, Royaume-Uni

LINDSAY, J.

Dep. of Geography, Univ., Guelph, Belgique

Description :
This paper develops an approach to extracting gully maps from high resolution digital elevation models (DEMs). Gully maps of the Bleaklow Plateau in northern England were derived from a 2 m LiDAR DEM by combining areas of low difference from mean elevation and high positive plan curvature. Gully depth was modelled by interpolating between gully edges. Testing of the gully mapping and depth modelling against aerial photography, manual interpretation of the DEM and ground survey revealed that gully plan form is well represented and gully width and depth are modelled with tolerances close to the horizontal and vertical resolution of the LiDAR imagery. This approach allows for the first time the derivation of accurate estimates of gully extent and magnitude over large areas and provides the basis for modelling a range of processes controlled by gullying.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 8, p. 876-886, nombre de pages : 11, Références bibliographiques : 30 ref.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais