Using 3D photo-reconstruction methods to estimate gully headcut erosion

Auteur(s) et Affiliation(s)



Description :
Three-dimensional photo-reconstruction methods (3D-PR) based on Structure from Motion (SfM) and MultiView-Stereo (MVS) techniques are tested for estimating the volume of gully headcut retreat. The study was carried out using 5 small headcuts in the Parapuños experimental catchment, SW Spain : 2 headcuts located along the channel and 3 lateral-bank headcuts. Firstly, the accuracy of the resulting models was tested using as benchmark a 3D model obtained by means of a Terrestrial Laser Scanner (TLS). Results of this analysis showed centimetre-level accuracies with average distances between the 2 point clouds for the 5 headcuts ranging from 0.009 m to 0.025 m. Then, using a Digital Elevation Model of Differences approach (DoDs) the volume of soil loss was estimated for every headcut. Total soil loss, erosion and deposition, was evaluated for a wet period (289 mm) of 54 days in 2013. Additionally, the use of historical photographs was explored with the aim of estimating long or medium-term erosion rates in gully heads. It is concluded that 3D-PR techniques showed a great potential for studying detailed geomorphic changes.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, vol. 120, p. 91-101, nombre de pages : 11, Références bibliographiques : 45 ref.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena