Continuous Monitoring of Fluvial Dike Breaching by a Laser Profilometry Technique

A nonintrusive, high‐resolution laser profilometry technique (LPT) has been developed for continuous monitoring of the three‐dimensional (3‐D) evolving breach in laboratory models of noncohesive fluvial dikes. This simple and low‐cost setup consists of a commercial digital video camera and a sweepin...

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Vydáno v:Water resources research Ročník 56; číslo 10; s. 2019 - n/a
Hlavní autoři: Rifai, I., Schmitz, V., Erpicum, S., Archambeau, P., Violeau, D., Pirotton, M., Dewals, B., El Kadi Abderrezzak, K.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Washington John Wiley & Sons, Inc 01.10.2020
American Geophysical Union
Wiley
Témata:
3D geometry reconstructions
3‐D geometry reconstructions
Algorithms
breach
Cameras
Civil engineering
Dike breaching
Dike failure
Dikes
diodes
Dyke breaching
Dyke failure
Embankments
Engineering, computing & technology
Environmental Sciences
Evolution
Fluvial dike
Fluvial dyke
geometry
Image processing
Ingénierie civile
Ingénierie, informatique & technologie
Laboratories
Laboratory experiments
Laboratory models
Laser profilometry Technique
Lasers
Linear transformations
LPT
Monitoring
Overtopping
Refraction
Resolution
Scale models
scanners
Surface waves
Sweeping
Turbidity
video cameras
water
ISSN:0043-1397, 1944-7973, 1944-7973
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Popis
Shrnutí:A nonintrusive, high‐resolution laser profilometry technique (LPT) has been developed for continuous monitoring of the three‐dimensional (3‐D) evolving breach in laboratory models of noncohesive 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 2‐D image coordinates of each deformed laser profile incident on the dike are transformed into 3‐D object coordinates using the direct linear transformation (DLT) algorithm. All 3‐D 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. Key Points A high resolution Laser Profilometry Technique has been developed for continuously monitoring the three dimensional dike breach shape The capabilities of the Laser Profilometry Technique have been assessed based on dedicated laboratory tests Reliable, time‐resolved database of the evolving dike breach geometry has been collected for testing the accuracy of numerical models
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scopus-id:2-s2.0-85093962690
ISSN:0043-1397
1944-7973
1944-7973
DOI:10.1029/2019WR026941