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(Article of periodic en Anglais - 2014)

Document title

Short-term geomorphic analysis in a disturbed fluvial environment by fusion of LiDAR, colour bathymetry and dGPS surveys

Authors(s) and Affiliation(s)

MORETTO J. (1) ; RIGON E. (1) ; MAO L. (2) ; DELAI F. (1) ; PICCO L. (1) ; LENZI M.A. (1) ;
(1) Dept. of Land, Environment, Agriculture and Forestry, Univ., Padova, ITALIE
(2) Dept. of Ecosystems and Environment, Pontifica Univ. Catolica, Santiago, CHILI

Abstract

The AA. aimed to develop a revised approach to generate detailed Digital Terrain Models (DTMs) of a river reach by merging LiDAR data for the dry area, with water depth indirectly derived from aerial imagery for wet areas. This approach was applied along 3 sub-reaches of the Brenta River (Italy) before and after 2 major flood events. A regression model relating water depth and intensity of the 3 colour bands derived from aerial photos, was implemented. More than 2400 in-channel depth calibration points were taken using a differential Global Positioning System (dGPS) along a wide range of underwater bed forms. The resulting DTMs closely matched the field-surveyed bed surface, and allowed to assess that a 10-year recurrence interval flood generated a predominance of erosion processes. The DTMs allowed the detection of processes such as riffle–pool downstream migration, and the progressive scour of a pool located near a rip-rap. This approach represents a valuable tool for river topography description, river management, ecology and restoration purposes, when bathymetric data are not available

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2014, no122 [pp. 180-195]

Bibliographic references : 2 p.

Collation : 12 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2014.06.023

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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