Sediment processes and flow reversal in the undular tidal bore of the Garonne River (France)

Reungoat, David, Chanson, Hubert and Caplain, Bastien (2014) Sediment processes and flow reversal in the undular tidal bore of the Garonne River (France). Environmental Fluid Mechanics, 14 3: 591-616. doi:10.1007/s10652-013-9319-y

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Author Reungoat, David
Chanson, Hubert
Caplain, Bastien
Title Sediment processes and flow reversal in the undular tidal bore of the Garonne River (France)
Journal name Environmental Fluid Mechanics   Check publisher's open access policy
ISSN 1567-7419
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s10652-013-9319-y
Open Access Status File (Author Post-print)
Volume 14
Issue 3
Start page 591
End page 616
Total pages 26
Place of publication Dordrecht, Netherlands
Publisher Springer
Language eng
Abstract A tidal bore is a series of waves propagating upstream as the tidal flow turns to rising, and the bore front corresponds to the leading edge of the tidal wave in a funnel shaped estuarine zone with macro-tidal conditions. Some field observations were conducted in the tidal bore of the Garonne River on 7 June 2012 in the Arcins channel, a few weeks after a major flood. The tidal bore was a flat undular bore with a Froude number close to unity: Fr1 = 1.02 and 1.19 (morning and afternoon respectively). A key feature of the study was the simultaneous recording of the water elevation, instantaneous velocity components and suspended sediment concentration (SSC) estimates, together with a detailed characterisation of the sediment bed materials. The sediment was some silty material (d50 ≈ 13 μm) which exhibited some non-Newtonion thixotropic behaviour. The velocity and SSC estimate were recorded simultaneously at high frequency, enabling a quantitative estimate of the suspended sediment flux at the end of the ebb tide and during the early flood tide. The net sediment flux per unit area was directed upstream after the bore, and its magnitude was much larger than that at end of ebb tide. The field observations highlighted a number of unusual features on the morning of 7 June 2012. These included (a) a slight rise in water elevation starting about 70 s prior to the front, (b) a delayed flow reversal about 50 s after the bore front, (c) some large fluctuations in suspended sediment concentration (SSC) about 100 s after the bore front and (d) a transient water elevation lowering about 10 min after the bore front passage. The measurements of water temperature and salinity showed nearly identical results before and after the tidal bore, with no evidence of saline and thermal front during the study.
Keyword Tidal bores
Garonne River (France)
Field measurements
Flow reversal
Suspended sediment processes
Sediment properties
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID MASCARET 10-BLAN-0911-01
Institutional Status UQ
Additional Notes The full bibliographic details are: REUNGOAT, D., CHANSON, H., and CAPLAIN, B. (2014). "Sediment Processes and Flow Reversal in the Undular Tidal Bore of the Garonne River (France)." Environmental Fluid Mechanics, Vol. 14, No. 3, pp. 591–616 (DOI: 10.1007/s10652-013-9319-y) (ISSN 1567-7419 [Print] 1573-1510 [Online]). The deposit is the postprint inline with Sherpa/Romeo policy for the journal.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 12 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 12 times in Scopus Article | Citations
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Created: Mon, 19 May 2014, 19:01:15 EST by Hubert Chanson on behalf of School of Civil Engineering