Article (Scientific journals)
Continuous monitoring of fluvial dike breaching by a Laser Profilometry Technique
Rifai, Ismail; Schmitz, Vincent; Erpicum, Sébastien et al.
2020In Water Resources Research, 56, p. 2019WR026941
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Keywords :
Dike breaching; Dyke breaching; Overtopping; Fluvial dyke; Fluvial dike; Dyke failure; Dike failure; Laser profilometry Technique; LPT; Refraction; 3D geometry reconstructions; Laboratory experiments
Abstract :
[en] A non-intrusive, high resolution Laser Profilometry Technique (LPT) has been developed for continuous monitoring of the three dimensional (3D) evolving breach in laboratory models of non-cohesive fluvial dikes. This simple and low cost setup consists of a commercial digital video camera and a sweeping red diode 30 mW laser projecting a sheet over the dike. The 2D image coordinates of each deformed laser profile incident on the dike are transformed into 3D object coordinates using the Direct Linear Transformation algorithm. All 3D object coordinates computed over a laser sweeping cycle are merged to generate a cloud of points describing the instantaneous surface. The DLT-based image processing algorithm uses control points and reference axes, so that no prior knowledge is needed on the position, orientation and intrinsic characteristics of the camera, nor on the laser position. Because the dike is partially submerged, ad hoc refraction correction has been developed. Algorithms and instructions for the implementation of the LPT are provided. Reconstructions of a dike geometry with the LPT and with a commercial laser scanner are compared in dry conditions. Using rigid dike geometries, the repeatability of the measurements, the refraction correction, and the dike reconstruction have been evaluated for submerged conditions. Two laboratory studies of evolving fluvial dike breaching due to flow overtopping have been conducted to demonstrate the LPT capabilities and accuracy. The LPT has advantages in terms of flexibility and spatiotemporal resolution, but high turbidity and water surface waves may lead to inaccurate geometry reconstructions.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Rifai, Ismail;  Egis Engineering
Schmitz, Vincent  ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Erpicum, Sébastien  ;  Université de Liège - ULiège > Scientifiques attachés au Doyen (Sc.appliquées)
Archambeau, Pierre  ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Violeau, Damien;  EDF > R&D > National Laboratory for Hydraulics and Environment
Pirotton, Michel ;  Université de Liège - ULiège > Département ArGEnCo > HECE (Hydraulics in Environnemental and Civil Engineering)
Dewals, Benjamin  ;  Université de Liège - ULiège > Département ArGEnCo > Hydraulics in Environmental and Civil Engineering
El Kadi Abderrezzak, Kamal;  EDF > R&D > National Laboratory for Hydraulics and Environment
Language :
English
Title :
Continuous monitoring of fluvial dike breaching by a Laser Profilometry Technique
Publication date :
2020
Journal title :
Water Resources Research
ISSN :
0043-1397
eISSN :
1944-7973
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
56
Pages :
e2019WR026941
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 September 2020

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