Publication Date:
2019
Description:
Abstract
The energetic, macrotidal shelf off South West England was used to investigate the influence of different tide and wave conditions and their interactions on regional sand transport patterns using a coupled hydrodynamic, wave and sediment transport model. Residual currents and sediment transport patterns are important for the transport and distribution of littoral and shelf‐sea sediments, morphological evolution of the coastal and inner continental shelf zones and coastal planning.
Waves heavily influence sand transport across this macrotidal environment. Median (50% exceedance) waves enhance transport in the tidal direction. Extreme (1% exceedance) waves can reverse the dominant transport path, shift the dominant transport phase from flood to ebb, and activate sand transport below 120m depth. Wave‐tide interactions (encompassing radiation stresses, Stoke's drift, enhanced bottom‐friction and bed shear stress, refraction, current‐induced Doppler shift and wave‐blocking) significantly and non‐linearly enhance sand transport, determined by differencing transport between coupled, wave‐only and tide‐only simulations.
A new continental shelf classification scheme is presented based on sand transport magnitude due to wave‐forcing, tide‐forcing and non‐linear wave‐tide interactions. Classification changes between different wave/tide conditions have implications for sand transport direction and distribution across the shelf. Non‐linear interactions dominate sand transport during extreme waves at springs across most of this macrotidal shelf. At neaps, non‐linear interactions drive a significant proportion of sand transport under median and extreme waves despite negligible tide‐induced transport. This emphasises the critical need to consider wave‐tide interactions when considering sand transport in energetic environments globally, where previously tides alone or uncoupled waves have been considered.
Print ISSN:
2169-9275
Electronic ISSN:
2169-9291
Topics:
Geosciences
,
Physics
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