The topographic data source of digital terrain models as a key element in the accuracy of hydraulic flood modelling

Auteurs :
CASAS, A.
BENITO, G.
THORNDYCRAFT, V.R.
RICO, M.

Description :
The effects of the topographic data source and resolution on the hydraulic modelling of floods were analysed. Seven digital terrain models (DTMs) were generated from three different altimetric sources : a global positioning system (GPS) survey and bathymetry; high-resolution laser altimetry data LiDAR (light detection and ranging); and vectorial cartography (1:5000). Selection criteria were established for the different topographic models in order to assess their generation and treatment in relation to the time-cost ratio for each methodology. the hydraulic modelling was carried out on a 2 km reach of the Ted River near Sant Juliá de Ramis near Girona in NE Spain.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2006, vol. 31, n°. 4, p. 444-456, nombre de pages : 13, Collation : Illustration, Références bibliographiques : 39 ref.

Date :
2006

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