Turbulence and suspended sediment processes in the Garonne River tidal bore in November 2016 |
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| Authors: | David Reungoat Xinqian Leng Hubert Chanson |
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| Institution: | 1. Université de Bordeaux, I2M, Laboratoire TREFLE, 16 Avenue Pey-Berland, Pessac, France;2. The University of Queensland, School of Civil Engineering, Brisbane, QLD 4072, Australia;3. CNRS UMR 5295, 33607 Pessac, France;1. Department of Civil Engineering, Stellenbosch University, Stellenbosch, South Africa;2. Christian-Doppler Laboratory for Multi-scale Modelling of Multiphase Processes, Johannes Kepler University, Austria;1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;2. Kunming Engineering Corporation Limited, Kunming 650041, China;1. Deltares, Boussinesqweg 1, 2629 HV Delft, The Netherlands;2. U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA;3. Ghent University, Technologiepark 68 905, B-9052 Zwijnaarde, Belgium;4. Leovanrijn-Sediment-Consultancy, Domineeswal 6, 8356 DS Blokzijl, The Netherlands;1. Department of Civil & Environmental Engineering, 941 rue Charles Bourseul, BP 10838, 59508 Douai, France;2. Toulouse University, Mines Albi, CNRS, RAPSODEE Center, Campus Jarlard, F-81013 Albi cedex 09, France;3. SOLVAY SA, DCRT, rue de Ransbeek 310, B-1120 Bruxelles, Germany;4. PRAYON SA, rue J. Wauters, Engis, Belgium;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;3. Department of Civil and Environmental Engineering, University of Alberta, 9211 116 St NW, Edmonton, Alberta T6G 1H9, Canada;4. Zhejiang Qianjiang Science and Technology Development Company, Hangzhou 310000, Zhejiang, China |
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| Abstract: | A tidal bore is a water discontinuity at the leading edge of a flood tide wave in estuaries with a large tidal range and funneling topography. New measurements were done in the Garonne River tidal bore on 14–15 November 2016, at a site previously investigated between 2010 and 2015. The data focused on long, continuous, high-frequency records of instantaneous velocity and suspended sediment concentration (SSC) estimate for several hours during the late ebb, tidal bore passage and flood tide. The bore passage drastically modified the flow field, with very intense turbulent and sediment mixing. This was evidenced with large and rapid fluctuations of both velocity and Reynolds stress, as well as large SSCs during the flood tide. Granulometry data indicated larger grain sizes of suspended sediment in water samples compared to sediment bed material, with a broader distribution, shortly after the tidal bore. The tidal bore induced a sudden suspended sediment flux reversal and a large increase in suspended sediment flux magnitude. The time-variations of turbulent velocity and suspended sediment properties indicated large fluctuations throughout the entire data set. The ratio of integral time scales of SSC to velocity in the x-direction was on average TE,SSC/TE,x ~ 0.16 during the late ebb tide, compared to TE,SSC/TE,x ~ 0.09 during the late flood tide. The results imply different time scales between turbulent velocities and suspended sediment concentrations. |
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| Keywords: | Tidal bore Garonne River Hydrodynamics Suspended sediment Field observations Turbulence-sediment suspension interactions |
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