The Temporal Variation of Flocs and Fecal Pellets in a Tidal Channel

Edelvang, Karen; Austen, I.

doi:10.1006/ecss.1996.0149

Cited by 29 publications

(12 citation statements)

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“…Large single grains are also resuspended, although a large proportion of the resuspended material is thought to consist of fecal pellets from the numerous Hydrobia ulvae feeding on the tidal flat (Lackschewitz, 1995). This is consistent with results from another investigation in the area (Edelvang & Austen, 1997), showing that high concentrations of fecal pellets from H. ulvae are present around lowwater slack.…”

Section: S U S P E N D E D S E D I M E N T C O N C E N T R a T I O N supporting

confidence: 92%

Tidal variation in the settling diameters of suspended matter on a tidal mud flat

Edelvang

1997

Helgoländer Meeresunters.

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Section: S U S P E N D E D S E D I M E N T C O N C E N T R a T I O N supporting

confidence: 92%

Tidal variation in the settling diameters of suspended matter on a tidal mud flat

Edelvang

1997

Helgoländer Meeresunters.

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“…The strong pelletisation of the surface bed significantly increases the settling velocity of eroded sediment (Edelvang and Austen, 1997;Andersen, 2001b;Andersen and Pejrup, 2002). On fine-grained tidal flats, this increase in settling velocity may result in an increase in the net landward flux of suspended sediment due to the associated increases in settling and scour lag.…”

Section: Comparison With Field Datamentioning

confidence: 99%

Enhanced erodibility of fine-grained marine sediments by Hydrobia ulvae

Andersen

Jensen

Lund-Hansen

et al. 2002

Journal of Sea Research

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The common mud snail Hydrobia ulvae is a widespread and dominant deposit feeder on fine-grained substrata along the European Atlantic coastline. Previous studies have shown that mud snail activities such as grazing, faecal pellet production and mucous production may influence physical properties of the surface sediment layer and thus depositional and erosional processes. To quantify the influence of Hydrobia density on key parameters such as erosion threshold and erosion rate, a shortterm laboratory experiment was conducted. Snails were placed on fine-grained sediment at densities of 10 000 and 50 000 ind m À 2 and erosion experiments were carried out one, three and five days after establishment of the sediment beds. Controls without H. ulvae were treated the same way. The presence of H. ulvae significantly increased the erosion rate and decreased the erosion threshold compared to snail-free control plots. The erosion rate was increased by a factor of 2 to 4 when H. ulvae were present and showed stronger influence by the snail than the erosion threshold. Snail density did not affect the erosion threshold, but the erosion rate doubled with an increase in density from 10 000 to 50 000 ind m À 2 . The erosion rate was only marginally different after one day but the difference increased over time and the erosion rate was significantly different for all treatments after five days. No significant time dependence was observed for the erosion threshold. The results generally confirm results obtained in situ and differences can be related to different hydrodynamic conditions under field and laboratory conditions. D

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“…In the Tay Estuary, sediment transport from shallow waters during ebb tide creates turbidity maxima in the deeper channel (Weir and McManus 1987). Transport from shallow water can also change the composition of suspended sediment in a deep channel; Edelvang and Austen (1997) observed fecal pellets from shoals in the adjacent deep channel at the end of ebb tide. In these cases, the deeper channel and shoal are communicating with one another.…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Variability of Suspended-Sediment Concentrations in a Shallow Estuarine Environment

Francisco

Ruhl²,

Schoellhamer³

2004

SFEWS

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Shallow subembayments respond differently than deep channels to physical forces acting in estuaries. The U.S. Geological Survey measured suspended-sediment concentrations at five locations in Honker Bay, a shallow subembayment of San Francisco Bay, and the adjacent channel to investigate the spatial and temporal differences between deep and shallow estuarine environments. During the first freshwater pulse of the wet season, the channel tended to transport suspended sediments through the system, whereas the shallow area acted as off-channel storage where deposition would likely occur. Following the freshwater pulse, suspended-sediment concentrations were greater in Honker Bay than in the adjacent deep channel, due to the larger supply of erodible sediment on the bed. However, the tidal variability of suspended-sediment concentrations in both Honker Bay and in the adjacent channel was greater after the freshwater pulse than before. During wind events, suspended-sediment concentrations in the channel were not affected; however, wind played a crucial role in the resuspension of sediments in the shallows. Despite wind-wave sediment resuspension in Honker Bay, tidally averaged suspended-sediment flux was controlled by the flooddominated currents.

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The Temporal Variation of Flocs and Fecal Pellets in a Tidal Channel

Cited by 29 publications

References 0 publications

Tidal variation in the settling diameters of suspended matter on a tidal mud flat

Tidal variation in the settling diameters of suspended matter on a tidal mud flat

Enhanced erodibility of fine-grained marine sediments by Hydrobia ulvae

Spatial and Temporal Variability of Suspended-Sediment Concentrations in a Shallow Estuarine Environment

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