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| Titel |
Optical method for measuring bed topography and flow depth in an experimental flume |
| VerfasserIn |
A. Limare, M. Tal, M. D. Reitz, E. Lajeunesse, F. Métivier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 2, no. 2 ; Nr. 2, no. 2 (2011-07-28), S.143-154 |
| Datensatznummer |
250000590
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| Publikation (Nr.) |
 copernicus.org/se-2-143-2011.pdf |
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| Zusammenfassung |
| 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. |
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