The formation of tidal sand waves: Fully three-dimensional versus shallow water approaches

Blondeaux, Paolo; Vittori, Giovanna

doi:10.1016/j.csr.2011.03.005

Cited by 14 publications

(8 citation statements)

References 16 publications

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“…• Non-hydrostatic component of the flow field impacts particularly bed forms with small wavelengths, in accordance with results presented by Blondeaux and Vittori [2011].…”

Section: Discussionsupporting

confidence: 90%

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Development of a Finite-Amplitude Morphodynamic Model for Tidal Sand Waves Based on Swash

Oyen

Suzuki

Zijlema

et al. 2012

Int. Conf. Coastal. Eng.

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Tidal sand waves are prominent bed forms occurring in coastal seas characterized by non-cohesive sediment deposits and relatively strong tidal currents (0.3 - 1.0 m/s). These bed features have a crest-to-crest distance between 100 and 500 m and are oriented approximately orthogonal to the main direction of the tidal current. Typical amplitudes are of the order of 1 to 10 m. Due to the ability of the bed forms to migrate, tidal sand waves pose serious hazards to many coastal structures such as pipe lines, monopiles and shipping lanes. Insight in the dynamics of these bed forms therefore is crucial for the long-term management of the coastal zone. In this work, we describe the development of a new generic numerical morphodynamic model to simulate the finite amplitude of tidal sand waves based on the hydrodynamic code SWASH.

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“…• Non-hydrostatic component of the flow field impacts particularly bed forms with small wavelengths, in accordance with results presented by Blondeaux and Vittori [2011].…”

Section: Discussionsupporting

confidence: 90%

“…Employing a stability analysis, [Blondeaux and Vittori, 2011] illustrated the influence of the nonhydrostatic pressure component on the generation of sand waves.…”

Section: Motivationmentioning

confidence: 99%

Development of a Finite-Amplitude Morphodynamic Model for Tidal Sand Waves Based on Swash

Oyen

Suzuki

Zijlema

et al. 2012

Int. Conf. Coastal. Eng.

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“…In any event, the water depth cannot be considered to be a major controlling factor. Recent works devoted to the process of the formation of tidal dunes have shown that predictions of the wavelengths of tidal dunes are strongly dependant on the mean water depth (Besio et al, 2006;Blondeaux and Vittori, 2011) and tend to be correlated (Van Santen et al, 2011).…”

Section: Equilibrium Conditionsmentioning

confidence: 99%

Giant dune morphologies and dynamics in a deep continental shelf environment: Example of the banc du four (Western Brittany, France)

et al. 2013

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“…Lastly, saw-tooth bars have a resemblance to sand waves (Németh et al 2002;Besio et al 2006;Blondeaux and Vittori 2011). Saw-tooth bars and sand waves have similar wave length scales, but sand waves occur on larger depths (~30 m) and their heights can be several meters (Németh et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Hulscher (1996) further found that sand wave height increases in offshore direction, so that would explain why saw-tooth bars are lower. Sand waves are created by an instability of a sandy bed interacting with the tidal current (Besio et al 2006;Blondeaux and Vittori 2011). Therefore, saw-tooth bars might be shallow water sand waves occurring on ebb-tidal delta lobes.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of saw-tooth bars on the ebb-tidal deltas of the Wadden Islands

2019

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Saw-tooth bars are shore-oblique sand bars that are found along most ebb-tidal deltas of the Frisian Wadden Islands. Although they might significantly affect sediment transport pathways and volumes on the deltas, their general characteristics and dynamics are largely unknown. The main aim of this paper is to determine the typical saw-tooth bar heights, wave lengths, widths, orientations, migration rates and depths of occurrence. To this end, we analysed bathymetries from the Dutch and German Frisian Wadden Islands between 1970 and 2015. Bar heights range between 0.5 and 2 m, and wave lengths range between 300 and 900 m, with an average of 670 m, and the bar crests have a down contour orientation of approximately 25°. The bars are between 800 and 2200 m wide. Saw-tooth bars are located at depths from 3 to 12 m, depending on the slope of the area. Migration speeds of up to 112 m/year were found, using a spatial correlation method. Bar height and migration speed are positively linearly correlated, as well as bar wave length and bar width, bar height and the orientation of the depth contours and migration speed and the orientation of the area. The derived characteristics are compared to those of other bar types to evaluate hypotheses regarding the formation mechanism of the bars.

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The formation of tidal sand waves: Fully three-dimensional versus shallow water approaches

Cited by 14 publications

References 16 publications

Development of a Finite-Amplitude Morphodynamic Model for Tidal Sand Waves Based on Swash

Development of a Finite-Amplitude Morphodynamic Model for Tidal Sand Waves Based on Swash

Giant dune morphologies and dynamics in a deep continental shelf environment: Example of the banc du four (Western Brittany, France)

Characteristics of saw-tooth bars on the ebb-tidal deltas of the Wadden Islands

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