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| Titel |
Technical Note: How image processing facilitates the rising bubble technique for discharge measurement |
| VerfasserIn |
K. P. Hilgersom, W. M. J. Luxemburg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 2 ; Nr. 16, no. 2 (2012-02-06), S.345-356 |
| Datensatznummer |
250013168
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| Publikation (Nr.) |
 copernicus.org/hess-16-345-2012.pdf |
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| Zusammenfassung |
| In this article, we rehabilitate the integrating rising bubble technique
as an effective means of obtaining discharge measurements. Since Sargent (1981, 1982a),
the technique has not been applied widely, mainly as a result of practical
difficulties. We hypothesize that modern image processing techniques
can greatly improve the rising bubble technique. We applied the technique
in both a laboratory setup and a field study, after determining the
bubble rising velocity for our nozzles in the specific case. During
our measurements, we captured digital photographs of the bubble envelope
at the water surface, each picture being a single measurement of the
discharge. The photographs were corrected for lens distortion and
reprojected so that accurate distances on water surface level could
be obtained. This easy digital procedure resulted in accurate discharge
measurements, even when turbulence was involved and the averages of
multiple image analyses yielded good results. The study shows that
the rising bubble technique can be a preferable discharge gauging
technique in some situations. Recent developments in image processing
facilitate the method substantially. |
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