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Roughness determination of coarse grained alpine river bed surfaces using Terrestrial Laser Scanning data

Climatic signals in geomorphological systems

Auteurs :
BAEWERT, H.
BIMBÖSE, M.
BRYCK, A.
RASCHER, E.
SCHMIDT, K.-H.
MORCHE, D.
ZIELHOFER, C.
VON SUCHODOLETZ, H.
LAUER, T.
HEINRICH, J.

Description :
The goal of this research is to improve upon the methods for roughness length determination in gravel-bed rivers using terrestrial laser scanning (TLS). To this end, 2 principle methodological considerations were examined. 1.) The influence of the number of scan positions on roughness calculation. 2.) The influence of grid-cell size on roughness calculation during post-processing. Scan data were furthermore compared to sediment samples to relate TLS-data to conventional roughness calculation methods. Several test sites in the Reintal valley, Bavaria, Germany were scanned from multiple orientations. The results from these experiments show that despite minor particle shading, roughness length determination does not depend significantly on the number of scan orientations used. However, results clearly show that roughness length determination depends highly on the choice of grid cell size during post processing. This study supports the use of TLS as the most appropriate and versatile method for roughness analysis in dry gravel bed river reaches.


Type de document :
Article de monographie

Source :
Zeitschrift für Geomorphologie, issn : 0372-8854, 2014, vol. 58, n°. 1, Supl., p. 81-95, nombre de pages : 15, Références bibliographiques : 38 ref.

Date :
2014

Editeur :
Pays édition : Allemagne, Stuttgart, Gebruder Borntraeger

Langue :
Anglais
Droits :
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