Numerous ecological problems of continental shelf ecosystems require a refined
knowledge of the evolution of suspended sediment concentrations (SSC). The present investigation
focuses on the spatial and temporal variabilities of near-surface SSC in coastal waters of the
English Channel (western Europe) by exploiting numerical predictions from the Regional Ocean
Modeling System ROMS. Extending previous investigations of ROMS performances in the Channel,
this analysis refines, with increased spatial and temporal resolutions, the characterization of
near-surface SSC patterns revealing areas where concentrations are highly correlated with
evolutions of tides and waves. Significant tidal modulations of near-surface concentrations
are thus found in the eastern English Channel and the French Dover Strait while a pronounced
influence of waves is exhibited in the Channel Islands Gulf. Coastal waters present furthermore
strong SSC temporal variations, particularly noticeable during storm events of autumn and winter,
with maximum near-surface concentrations exceeding 40 mg l1 and increase by a factor from
10 to 18 in comparison with time-averaged concentrations. This temporal variability strongly
depends on the granulometric distribution of suspended sediments characterized by local bimodal
contributions of silts and sands off coastal irregularities of the Isle of Wight, the Cotentin
Peninsula and the southern Dover Strait.
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