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- W2613192669 abstract "Estuaries are a critical interface between land and coastal ocean across which freshwater, suspended particulatematter (SPM), and consequently terrestrial carbon, nutrients and anthropogenic contaminants are exchanged.Suspended particulate matter is closely linked to estuarine turbidity; it affects water quality and estuarine ecology;and it contributes to overall estuarine sediment budgets. However, predicting the response of estuarine ecosystemsto climate change and human interventions remains difficult partly due to a lack of comprehensive understandingof SPM concentrations and fluxes across time scales from intratidal to seasonal and interannual variability.We investigate the dynamics of suspended sediment and suspended particulate matter in a hypertidal estuarywith a maximum tidal range in excess of 10 m and tidal currents reaching over 1 m/s: the Dee Estuary. Thisestuary is located in northwest England and outflows in Liverpool Bay, itself in the eastern Irish Sea. The DeeEstuary is a funnel-shaped, coastal plain estuary, which is about 30 km long with a maximum width of 8.5 km at themouth, and consists of mixed sediments.We focus on field observations, collected during several campaigns in thechannels of the Dee Estuary from 2004 to 2009 using acoustic and optical instrumentation, which provide intratidalmeasurements of flow velocity and suspended sediment, and thus sediment fluxes, over approximately a month.Measurements in February-March 2008 highlight three distinct hydrodynamic regimes: a current dominantregime at neap tides (14-21 February); a combined wave-current regime at spring tides (21-29 February); and awave dominant regime at neap tide (1-4 March). While analysis of tidal distortion and dominance predicts weakebb dominant channels, the observations yield flood dominant sediment transport. The net sediment flux exhibits atwo-layer structure – import near the bed, export near the surface – that is consistent with the residual circulationsin the estuary. Wavelet analysis provides clear evidence that such influx of sediment in the estuary is alternativelythe result of periodic stratification at neap tides and of tidal asymmetry in suspended sediment concentration atspring tides. Such transient processes will be important to determine and predict estuarine responses to short-livedperturbations. Further analysis of other field campaigns will enable to determine the persistence of these processesover seasonal and annual timescales." @default.
- W2613192669 created "2017-05-19" @default.
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- W2613192669 date "2017-04-01" @default.
- W2613192669 modified "2023-09-23" @default.
- W2613192669 title "Transient controls on estuarine SPM fluxes: case study in the Dee Estuary, UK" @default.
- W2613192669 hasPublicationYear "2017" @default.
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