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Optical Method for Measuring Bed Topography and Flow Depth in an Experimental Flume : Volume 2, Issue 2 (28/07/2011)

By Limare, A.

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Book Id: WPLBN0004021114
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Optical Method for Measuring Bed Topography and Flow Depth in an Experimental Flume : Volume 2, Issue 2 (28/07/2011)  
Author: Limare, A.
Volume: Vol. 2, Issue 2
Language: English
Subject: Science, Solid, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Tal, M., Lajeunesse, E., Reitz, M. D., Métivier, F., & Limare, A. (2011). Optical Method for Measuring Bed Topography and Flow Depth in an Experimental Flume : Volume 2, Issue 2 (28/07/2011). Retrieved from

Description: Equipe de Dynamique des Fluides Géologiques, Institut de Physique du Globe de Paris (IPGP, UMR 7154, CNRS, Univ. Paris Diderot), 1 rue Jussieu, 75238 Paris Cedex 05, France. We describe an optical method known as moiré for acquiring quasi-simultaneous measurements of bed topography and flow depth in laboratory experiments. The moiré method is based on projecting a fringe pattern (grating) on the bed and analyzing the deformation of the pattern caused by the topography with respect to a reference plane. The height of the object is encoded in the phase of the pattern and can be retrieved either through Fourier transform or phase shifting algorithms. The methodology enables image-based non-contact measurements over a continuous surface at very high spatial and temporal resolutions. We use a commercial software package of a moiré method called Light3D to map bed topography and flow depth in an experimental braided channel and demonstrate how the method can be used to characterize a full range of statistics not previously possible.

Optical method for measuring bed topography and flow depth in an experimental flume

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