Title: The potential of 3D gully monitoring with GIS using high-resolution aerial photography and a digital photogrammetry system
Authors: Marzolff, I ×
Poesen, Jean #
Issue Date: 2009
Publisher: Elsevier
Series Title: Geomorphology vol:111 pages:48-60
Abstract: Although gully erosion is generally considered a major process of land degradation, its contribution to total
soil loss by erosion has recently been a subject of much discussion. The lack of adequate methods for the
documentation and monitoring of gullies resulted in the shortage of quantitative data. Therefore, a highresolution
remote sensing system for aerial surveys by blimp or kite has been developed which meets spatial
and temporal image resolutions required for short-term gully monitoring. The objective of this paper is to
examine the potential of a method using non-metric digital photogrammetry and GIS for gully surface
modelling and monitoring. Two bank gullies representing different morphological types of gullies (V-shaped
and U-shaped) were chosen from a dataset of gully systems in semi-arid Spain. The considerable relief energy
and complex topography of the gullies in a natural, vegetated landscape were found to be a challenge to
digital photogrammetric techniques, introducing errors which inhibit fully automated DEM generation. Using
a hybrid method combining stereomatching for mass-point extraction with manual 3D editing and digitizing,
high-resolution DEMs (5 and 7.5 cm pixel size) were created for the study sites. GIS analysis of the DEMs for
different monitoring periods (2 to 4 years) allowed the computation of gully area and volume, as well as their
changes with an accuracy and detail sufficient to represent the geomorphological forms and processes
involved. Furthermore, the spatially continuous survey of the entire form offered the possibility of
distinguishing different zones of activity both at the gully rim and within the gully interior, identifying
patterns of erosion and deposition which indicate the limited use of headcut retreat rates for the assessment
of sediment production on a short-term basis.
ISSN: 0169-555X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Geography & Tourism
× corresponding author
# (joint) last author

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