Sediment transport induced by tidal bores. An estimation from suspended matter measurements in the Sée River (Mont-Saint-Michel Bay, northwestern France)

Furgerot, Lucille; Mouazé, Dominique; Tessier, Bernadette; Perez, Laurent; Haquin, Sylvain; Weill, Pierre; Crave, Alain

doi:10.1016/j.crte.2015.09.004

Cited by 29 publications

(24 citation statements)

References 14 publications

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“…The passage of tidal bores was found to place into suspension large amounts of fine sediments, which were advected in the wake of the bore front (WOLANSKI et al 2004. In-situ observations were reported in both small rivers (FURGEROT et al 2016, SIMPSON et al 2004) and large estuarine systems , FAN et al 2014. LENG, X., .…”

Section: Introductionmentioning

confidence: 99%

Turbulence and turbulent flux events in tidal bores: case study of the undular tidal bore of the Garonne River

2017

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The tidal bore of the Garonne River (France) was investigated on 29 August, 31 August and 27 October 2015, during which instantaneous velocity measurements were performed continuously at highfrequency (200 Hz). The tidal bore occurrence had a marked effect on the flow field and turbulent Reynolds stress data, indicating large shear stresses, together with large and rapid fluctuations, during the bore passage and the early flood tide. Like many natural process flows, the tidal bore flow motion was dominated by coherent structure activities and turbulent events, with significant impact on the natural systems including in terms of sediment processes. Herein a new turbulent event analysis was developed for the highly-unsteady rapidly-varied tidal bore flow. The analysis was based upon basic concepts, in which turbulent bursting events were defined in terms of the instantaneous relative turbulent flux, and the method was extended to the rapidly-varied, highly-unsteady tidal bore motion. The turbulent event data showed relatively close results for most fluxes during the tidal bores. The event duration showed some tidal trend, with longer turbulent events immediately after the tidal bore passage, occurring simultaneously with major sediment erosion processes. The field data set and analyses suggested that a turbulent event analysis may be applicable to highly-unsteady rapidly-varied flows, providing quantitative details into the turbulent bursts that are responsible for major mixing and sedimentary processes.

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Section: Introductionmentioning

confidence: 99%

Turbulence and turbulent flux events in tidal bores: case study of the undular tidal bore of the Garonne River

2017

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“…Experimental and numerical analyses showed some transient flow reversal next to the bed and close to the bore passage (Docherty & Chanson, ; Khezri & Chanson, ; Koch & Chanson, ; Leng & Chanson, , ; Lubin et al, ); however, this occurrence is relatively weak and related to flow separation and recirculation due to the upward deviation of the main flow at the foot of the bore (Liu et al, ; Lubin et al, ). In the case of a tidal bore, in which also the bulk flow velocity at the head of the front actually reverses (Furgerot et al, ; Masoud et al, ; Simpson et al, ), the reverse flow is typically much stronger. This is a very important aspect that must be considered in the experimental study of the characteristics of a tidal bore front, in order to properly assess the enhanced mixing and erosion processes related to the flow reversal at the bore passage.…”

Section: Resultsmentioning

confidence: 99%

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Viero

Defina

2018

Water Resources Research

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A tidal bore is a positive wave traveling upstream along the estuary of a river, generated by a relatively rapid rise of the tide, often enhanced by the funneling shape of the estuary. The swell produced by the tide grows and its front steepens as the flooding tide advances inland, promoting the formation of a sharp front wave, that is, the tidal bore. Because of the many mechanisms and conditions involved in the process, it is difficult to formulate an effective criterion to predict the bore formation. In this preliminary analysis, aimed at bringing out the main processes and parameters that control tidal bore formation, the degrees of freedom of the problem are largely reduced by considering a rectangular channel of constant width with uniform flow, forced downstream by rising the water level at a constant rate. The framework used in this study is extremely simple, yet the problem is still complex, and the solution is far from being trivial. From the results of numerical simulations, three distinctive behaviors emerged related to conditions in which a tidal bore forms, a tidal bore does not form, and a weak bore forms; the latter has a weakly steep front and after the bore formed it rapidly vanishes. Based on these behaviors, some criteria to predict the bore formation are proposed and discussed. The more effective criterion, suitably rearranged, is checked against data from real estuaries, and the predictions are found to compare favorably with the available data.

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“…The previous studies showed that the suspended sediment will resuspend and increase the erosion when the tidal bore passage [4]. For example, the sediment transport due to the tidal wave propagation created some smal island in the river and bank erosion near Muda island and mouth of Sekap river [5]. The measurement suspended sediment concentration (SSC) transport induced by tidal bore in the See reiver showed that SSC increase greater than 30g/L during the tidal ore passage.…”

Section: Fields Observationmentioning

confidence: 99%

“…The measurement suspended sediment concentration (SSC) transport induced by tidal bore in the See reiver showed that SSC increase greater than 30g/L during the tidal ore passage. After the tidal bore passage, then the SSC gradually increase over the whole water column with the amplitude is about 2m [5].…”

Section: Fields Observationmentioning

confidence: 99%

“…For example the river discharge damps the tidal bore propagation in alluvial estuary [4]. Another observation showed that the suspended sediment concentration (SSC) will increase when the tidal bore passage [5]. When the bore propagate into the upstream , the free surface increase and flow velocity decrease rapidly under the bore front to satisfy the conservation of mass and energy.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Effect of Tidal Bore Propagation in Kampar River

Sulaiman

2017

MATEC Web Conf.

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Abstract. The environmental effect of the tidal bore propagation in kampar river is investigated. Propagation of the tidal bore satisfy Korteweg and de Vries (KdV) equation where the environmental effect will be given as a perturbation term of the KdV equation. The environmental efects taken into considérations are river discharge and bottom sediment. The result show that a river discharge that flow opposite to wave motion will give the damping effect that is decreasing of the wave velocity and the amplitude. The bottom sediments will give the damping effect so that a fine bottom sediment would cause the waves propagte slower than coarse sediment.

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Sediment transport induced by tidal bores. An estimation from suspended matter measurements in the Sée River (Mont-Saint-Michel Bay, northwestern France)

Cited by 29 publications

References 14 publications

Turbulence and turbulent flux events in tidal bores: case study of the undular tidal bore of the Garonne River

Turbulence and turbulent flux events in tidal bores: case study of the undular tidal bore of the Garonne River

Consideration of the Mechanisms for Tidal Bore Formation in an Idealized Planform Geometry

Environmental Effect of Tidal Bore Propagation in Kampar River

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