Monitoring sediment source areas in a debris-flow catchment using terrestrial laser scanning

Auteur(s) et Affiliation(s)



Description :
Geomorphic changes caused by 3 debris-flow events in a small mountain catchment (Moscardo Torrent, Eastern Italian Alps) were investigated by means of multitemporal terrestrial laser scanning (TLS) surveys over 3 areas exposed to debris-flow dynamics. For these areas, DEM of Differences (DoDs) with a 0.2 m spatial resolution allowed the assessment of elevation uncertainty as spatially variable by applying the fuzzy inference system (FIS). A new index, named Vegetation Noise, that takes into account the disturbance caused by the vegetation cover on the DEM accuracy is proposed. The results of volumetric budgets of the surveyed sediment source areas derived from the DoD analysis were compared with debris-flow volumes estimated from flow stage measurements at the instrumented channel reach, underlining advantages and limitations of TLS surveys over morphologically complex areas such as debris-flow catchments.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, vol. 123, p. 23-36, nombre de pages : 14, Références bibliographiques : 1 p.

Date :
2014

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