Tidal sand movement between some linear sand banks in the North Sea off northeast Norfolk

Caston, V.N.D.; Stride, A. H.

doi:10.1016/0025-3227(70)90018-6

Cited by 78 publications

(38 citation statements)

References 5 publications

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“…This spatial organisation, including a residual vorticity within the bedform field, was previously described in tidal dominated environments for shelf ridges in which an asymmetry in the current strength on either side of the bank, maximum currents being in the ebb direction on one side and in the flood direction on the other, caused sediment accumulation (Caston and Stride, 1970;Huthnance, 1973;McCave and Langhorne, 1982). It is assumed to be the combined effects of Coriolis and friction forces above the seabed that generate the horizontal deflection of the oscillatory flow over tidal ridges (Huthnance, 1973;Pattiaratchi and Collins, 1987;Trentesaux et al, 1999;Dyer and Huntley, 1999).…”

Section: Morphology Changes and Hydro-sedimentary Processesmentioning

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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Section: Morphology Changes and Hydro-sedimentary Processesmentioning

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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“…Evidence for M2 tidal vorticity is gleaned from the fact that the tidal stream amplitude reaches maximum values (~3t knots) some 6 nautical miles off the coast near Great Yarmouth where the tidal streams are only about 2 knots. However, inferred migration directions of some Norfolk sandbanks in this region (Caston & Stride, 1970) have suggested that the circulations around the Norfolk Banks are on the contrary clockwise. Low values of Ro~0'2 (see Appendix II) for the maximum tidal flow along the East Anglian coast are consistent with gross asymmetry.…”

Section: Transfer Of Vorticity From the Tide To The Mean Flowmentioning

confidence: 99%

The Formation Of The Shambles And Other Banks By Tidal Stirring Of The Seas

Pingree

1978

J. Mar. Biol. Ass.

142

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It is well known that if a beaker of water, to which a little sand has been previously added, is stirred, then the sand moves along the bottom and accumulates in the centre. The result is the same whether the beaker is stirred clockwise or anticlockwise. It is perhaps less obvious, but equally true, that if the beaker is placed on a rotating table, then stirring clockwise and anticlockwise produces different effects. Any stirring rate in the sense of rotation may produce a concentration of sand towards the centre (better effects may be observed with less dense material – tea leaves for example). However, if the stirring is against the rate of rotation, then it is necessary to exceed the rotation rate before sand will accumulate in the centre of the beaker. In an analogous manner, ‘spinup’ of the table produces dispersion of bottom material, whereas spin-down results in a concentration of material towards the centre of the beaker.

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“…, "Tidal current asymmetries over the Norfolk Sandbanks", was motivated by some unexplained observations of mean flows along sandbanks (Caston and Stride 1970). These sandbanks were typically 40 km long by 2 km wide, of height 30 m in the shallow water of depth of 40 m and critically were present in the tidally active waters in the southern North Sea.…”

Section: Introductionmentioning

confidence: 99%

Tidally induced mean flow over bathymetric features: a contemporary challenge for high-resolution wide-area models

Polton

2014

Geophysical & Astrophysical Fluid Dynamics

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Huthnance [Estuarine Coastal Mar. Sci. 1973, 1, 89-99] is reviewed, whereby an oscillating tide over bathymetric features induces a mean flow generally along isobaths. The effect is a superposition of Coriolis and frictional processes. These are discussed with the intention of elucidating the processes for a more general readership. Induced velocities of order several cm s −1 are expected around the UK shelf seas. The effect is dynamically significant over bathymetric scales of order a few kilometres and has previously been of most interest to dynamicists studying processes on this scale. However, with the increase in computing power, appropriate scales can be simulated in shelf-wide regional models and in next generation operational models. It is demonstrated that this small-scale effect is likely to be important for shelf-wide regional models and that a spatial resolution of at least 1.8 km is recommended for shelf sea simulations.

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Tidal sand movement between some linear sand banks in the North Sea off northeast Norfolk

Cited by 78 publications

References 5 publications

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

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

The Formation Of The Shambles And Other Banks By Tidal Stirring Of The Seas

Tidally induced mean flow over bathymetric features: a contemporary challenge for high-resolution wide-area models

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