Tide and surge propagation off-shore in the Dowsing region of the North Sea

Pugh, David; Vassie, J. M.

doi:10.1007/bf02226659

Cited by 83 publications

(36 citation statements)

References 7 publications

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“…Nonlinear effects in the near-shore region generated higher harmonics of the M 2 tide and gave appreciable tide-surge interaction, as found in observations in this and other areas (e.g. Bobanovic et al 2005;Horsburgh and Wilson 2007;Kagan et al 2005;Pugh and Vassie 1976).…”

Section: Numerical Modelsupporting

confidence: 52%

Influence of sea surface wind wave turbulence upon wind-induced circulation, tide–surge interaction and bed stress

2012

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A three-dimensional finite volume unstructured mesh model of the west coast of Britain, with high resolution in the coastal regions, is used to investigate the role of wind wave turbulence and wind and tide forced currents in producing maximum bed stress in the eastern Irish Sea. The spatial distribution of the maximum bed stress, which is important in sediment transport problems, is determined, together with how it is modified by the direction of wind forced currents, tide-surge interaction and a surface source of wind wave turbulence associated with wave breaking. Initial calculations show that to first order the distribution of maximum bed stress is determined by the tide. However, since maximum sediment transport occurs at times of episodic events, such as storm surges, their effects upon maximum bed stresses are examined for the case of strong northerly, southerly and westerly wind forcing. Calculations show that due to tide-surge interaction both the tidal distribution and the surge are modified by non-linear effects. Consequently, the magnitude and spatial distribution of maximum bed stress during major wind events depends upon wind direction. In addition calculations show that a surface source of turbulence due to wind wave breaking in shallow water can influence the maximum bed stress. In turn, this influences the wind forced flow and hence the movement of suspended sediment. Calculations of the spatial variability of maximum bed stress indicate the level of measurements required for model validation.

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Section: Numerical Modelsupporting

confidence: 52%

Influence of sea surface wind wave turbulence upon wind-induced circulation, tide–surge interaction and bed stress

2012

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“…Inputs to the model included M 2 , S 2 , K 1 and O 1 tidal components (lunar semi diurnal, solar semi diurnal, lunisolar diurnal and lunar diurnal, respectively), wind data, and a southerly flowing Leeuwin Current of 0.1 m s -1 (Burling et al 2003). Other parameters included a standard bottom-friction factor of 0.0025 (Pugh & Vassie 1976) and a Coriolis factor of 6.3 × 10 -5 s -1…”

Section: Methodsmentioning

confidence: 99%

Hydrodynamic modelling of snapper Pagrus auratus egg and larval dispersal in Shark Bay, Western Australia: reproductive isolation at a fine spatial scale

Nahas

Jackson²,

Pattiaratchi³

et al. 2003

Mar. Ecol. Prog. Ser.

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Ichthyoplankton data collected between 1997 and 2000 were combined with the results of numerical modelling to investigate the dispersal of snapper Pagrus auratus eggs and larvae in Shark Bay, Western Australia. A 3-dimensional hydrodynamic model was coupled with a 2-dimensional Lagrangian particle-tracking program to simulate passive transport of these planktonic particles. Modelling analysed the separate and combined effects of the region's principal hydrodynamic forces of tide, wind and the Leeuwin Current. Model runs simulated a 30 d period to recreate residual transport on time scales encompassing early snapper development prior to settlement. Hydrodynamic conditions during winter were tidally dominated and exhibited minimal residual flows. Eggs and larvae were retained within residual eddies that were coincident with the 4 main spawning areas. No connectivity between these areas was observed. The results provided further evidence of the existence of a number of proximate but geographically discrete spawning populations of snapper in Shark Bay waters. Hydrodynamic retention provides a mechanism that partly explains existing data indicating that snapper stock-structure in the region is complex. Such information is fundamental to determining the most appropriate geographic scale at which local snapper populations should be managed.

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“…The requirement to perform a 6 month simulation is based upon the use of the synod period (the time for two tidal constituents to separate in time by a complete cycle, here for the S 2 and K2 tides) as a guide to the accuracy of the harmonic analysis method when applied to observational data. This is often referred to as the Rayleigh criterion [Pugh, 1989] Table 4 suggest that if any error of the order of + 1.5 cm s 4 (comparable with the error in the current meter data of order + 2 cm s -1, [Pugh and Vassie, 1976] can be tolerated, then the harmonic analysis of about 60 days of computed currents is sufficient, although for a higher accuracy a 90 day period is required.…”

Section: Influence Of Data Span Upon the Accuracy Of The Tidal Harmonicsmentioning

confidence: 99%

Tidal energy fluxes and dissipation on the European continental shelf

Davies¹,

Kwong²

2000

J. Geophys. Res.

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Abstract. The spatial distribution of the energy flux, energy dissipation, current magnitude, and surface elevation amplitude of the major tidal constituents over the northwest European shelf are examined in detail. These distributions are obtained from the harmonic analysis of a 6 month three-dimensional simulation of 28 tidal constituents. The model currents are validated by a comparison of computed tidal harmonics against those derived from a harmonic analysis of up to 278 current time series. A similar comparison is performed for tidal elevations based on 257 tide gauges. Calculations show that for the most significant tidal constituents (e.g., M2, S2 and K2) there is a major energy flux in the deep water along the shelf edge off the northwest of Scotland, with some energy leaking onto the shelf and into the North Sea. A second source of energy is across the shelf edge at the southern end of the Celtic Sea, with this energy flux propagating into the Irish Sea and southern North Sea, where the majority of the energy is dissipation in the shallow regions. Significantly different distributions are found for the diurnal and shallow water constituents, and the spatial distributions of energy flux and dissipation of the various constituents are considered. The accuracy of separating tidal current harmonics using model data of less than a synodic period is examined with reference to the S2 and K2 tide. Calculations suggest that the accuracy of computed currents comparable to those obtained from observations can be obtained from an analysis of a 60 day period compared with the synodic period for S2 and K2 of 182 days, a significant saving in computer time.

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Tide and surge propagation off-shore in the Dowsing region of the North Sea

Cited by 83 publications

References 7 publications

Influence of sea surface wind wave turbulence upon wind-induced circulation, tide–surge interaction and bed stress

Influence of sea surface wind wave turbulence upon wind-induced circulation, tide–surge interaction and bed stress

Hydrodynamic modelling of snapper Pagrus auratus egg and larval dispersal in Shark Bay, Western Australia: reproductive isolation at a fine spatial scale

Tidal energy fluxes and dissipation on the European continental shelf

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