Ring-waves generated by water drops impacting on water surfaces at rest

Craeye, Christophe; Sobieski, Piotr; Bliven, Larry F.; Guissard, A.

doi:10.1109/48.775294

Cited by 26 publications

(15 citation statements)

References 16 publications

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“…Moreover, it may be the only flow feature, which is readily accessible to measurements by imaging or remote sensing methods (e.g. Stilwell and Pilon 1974;Nicolas et al 1997;Craeye et al 1999). Both circumstances are encountered in the present study of antidune flows.…”

Section: Introductionmentioning

confidence: 79%

“…Approaches based on shading, reflection and refraction have been developed for this purpose, and are reviewed in Ja¨hne et al (1994). Recent measurements based on reflection are documented in Craeye et al (1999) and Dabiri and Gharib (2001), while recent studies relying on refraction (shadowgraph) include Weigand (1996) and Lang and Gharib (2000). These techniques, however, are subject to various limitations.…”

Section: Introductionmentioning

confidence: 99%

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Stereoscopic and velocimetric reconstructions of the free surface topography of antidune flows

et al. 2005

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Imaging methods developed to characterise the oscillatory free surface of rapid flows are presented and applied to torrential currents over sediment antidunes. The aim is to obtain high-resolution relief maps of the free surface topography. Two measurement principles are tested, both based on the imaging of floating tracers dispersed on the rapidly flowing surface. The first technique involves direct stereoscopic measurements. The second technique is indirect, and exploits a Bernoulli relation to derive surface elevations from the horizontal velocity field acquired using a single camera. Special attention is paid to error estimation and control. Relief maps obtained for various bedform patterns are presented, allowing comparison between the two techniques.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Stereoscopic and velocimetric reconstructions of the free surface topography of antidune flows

et al. 2005

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“…According to Le Mehaute's study, the number of rings increases with time and distance. The ring waves generated by raindrops can impact the detecting of radar [3] . An optical method was developed to measure wave profiles along the radius [3] .…”

mentioning

confidence: 99%

“…The ring waves generated by raindrops can impact the detecting of radar [3] . An optical method was developed to measure wave profiles along the radius [3] . They concluded the characteristic wave number is 0.2 mm 1 .…”

mentioning

confidence: 99%

Experiments on ring wave packet generated by water drop

GuoZhen

2008

Sci. Bull.

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“…More recently, Nicolas et al [29] utilized radar to remotely detect surface velocity. Craeye et al [30] employed an optical technique to indirectly analyze the wave surface using a mirror image. Dabiri and Gharib [31] investigated water surface deformation using a free surface gradient detector technique.…”

Section: Introductionmentioning

confidence: 99%

Oscillating Water Surface Measurement of Free Overfall with a Plunge Pool

Tsung¹,

Lai²,

Wang³

2015

JFCMV

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This study presents a laser-sheet imaging technique to measure the water surface of free overfalls with plunge pool. Varying the plunge pool length of a constant approach discharge created skimming, periodic oscillatory, and nappe flows. This study analyzes the resulting oscillating water surfaces and temporal variations of water stages at particular positions in the periodic oscillatory flow condition. The oscillation period and amplitude of temporal water stage variation were determined by directly measuring the time interval and water stage differences in water stage variations, respectively. The plunge pool length and air pocket characteristics seriously affected the periodic oscillatory flow. The oscillation period increased as the plunge pool length increased. On the other hand, the water stage amplitude decreased sharply when the plunge pool exceeded a specific length. The absence of an air pocket beneath the falling nappe significantly increased the oscillation period and decreased the water stage amplitude. This study investigates water surface oscillation in the plunge pool and the upstream side of the drop. However, the mean end depth of a periodic oscillatory flow with an air pocket is also applicable to discharge estimation using the end depth method.

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Ring-waves generated by water drops impacting on water surfaces at rest

Cited by 26 publications

References 16 publications

Stereoscopic and velocimetric reconstructions of the free surface topography of antidune flows

Stereoscopic and velocimetric reconstructions of the free surface topography of antidune flows

Experiments on ring wave packet generated by water drop

Oscillating Water Surface Measurement of Free Overfall with a Plunge Pool

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