Reconsidering the Physics of the Chesapeake Bay Estuarine Turbidity Maximum

Sanford, Lawrence P.; Suttles, Steven E.; Halka, Jeffrey P.

doi:10.2307/1352874

Cited by 144 publications

(105 citation statements)

References 44 publications

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“…The formation of the TMZ is generally attributed to gravitational circulation, tidal trapping, and sediment resuspension (Wai et al, 2004). TMZ has been observed and studied in many estuaries, including Gironde Estuary in France (Allen et al, 1977), Chesapeake Bay in USA (Sanford et al, 2001), St. Lawrence Estuary in Canada (Hamblin, 1989), Fly River Estuary in Papua New Guinea (Wolanski et al, 1995), Tamar Estuary in England (Uncles and Stephens, 1993), and Changjiang Estuary in China (Shen et al, 2008). However, the formation mechanism of TMZ varies between different estuaries, the location and intensity of TMZ are sensitive to changes in tidal range and freshwater flow within one estuary (Mitchell, 2013).…”

Section: Introductionmentioning

confidence: 99%

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Huang

et al. 2017

Journal of Environmental Sciences

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Section: Introductionmentioning

confidence: 99%

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Huang

et al. 2017

Journal of Environmental Sciences

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“…It is well known that re-suspended particles settle to the sediment bed during slack period before starting of ebb tide. They get re-suspended from the sediment with ebb currents, remain suspended to a certain degree and then settle to the bottom 47 . The pathogenic bacteria attached to suspended particles increase their downward flux to the bottom sediment 11,48 .…”

Section: Discussionmentioning

confidence: 99%

“…The flood tide currents cause re-suspension of sediment bed and transfer particles towards land. During ebb currents particles move towards the sea and settle to the bottom sediment 47,50 . An earlier study in this estuary had also pointed out that the effluents containing high numbers of pathogenic bacteria accumulate towards downstream during low tide-period 6 .…”

Section: Discussionmentioning

confidence: 99%

Spatio-Temporal Variations in Pathogenic Bacteria in the Surface Sediments of the Zuari Estuary, Goa, India

Gardade

Khandeparker

2017

Current Science

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Estuaries are hotspots of anthropogenic activities. The deposition of pathogenic bacteria in the sediment and their re-suspension into the water column are influenced by riverine discharge and tides. The abundance of Escherichia coli O157:H7, Shigella spp., Salmonella spp., total coliforms (TC) and Vibrio spp. (Vibrio cholerae (VC), Vibrio parahaemolyticus (VP), Vibrio alginolyticus (VA)) was assessed along with the total bacterial count (TBC) and total viable count (TVC) in surface sediments along the banks of the Zuari estuary, Goa, India. The study was carried out fortnightly for a period of 17 months covering three seasons, i.e. pre-monsoon (PreM), monsoon (MON) and postmonsoon (POM). The spatial and temporal changes in the quality of organic matter were also assessed. The organic matter content was high and rich in carbohydrates and proteins towards upstream sites. The quality of organic matter was influenced by the seasons. E. coli O157:H7 was detected only during MON towards the upstream stations. A negative correlation between TC and TBC with salinity was evident indicating the influence of land run-off. The Shigella spp. and VA were high towards the mouth of the estuary during PreM. However, during POM, the TVC, TC and VP were abundant towards the upstream and VC were abundant at the mouth of the estuary. Among the Vibrios, VP and VA were the most frequently occurring bacteria whereas TC and Shigella spp. were dominant among allochthonous pathogens in the sediments irrespective of space and time. In addition to influence of seasons, the sampling time influenced by tidal condition also played an important role in the population dynamics of pathogenic bacteria in the sediments. Future studies should address the interaction of pathogenic bacteria with suspended particles, their transport and survival in the sediments.

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“…closer to the river mouth) than recorded during our sampling in June, when discharge in the Gulf of Finland catchment is at its annual 30 maximum (Voipio, 1981). Assuming the suspended particulate maximum and associated gravitational settling to follow the lateral migration of the halocline through time (Geyer, 1993;Sanford et al, 2001), the focal point of sedimentation for flocculated material may thus be closer to the river mouth than implied by the June 2015 data. Notably, maximum sedimentary Fe concentrations were observed at station B (Fig.…”

Section: The Impact Of Flocculation On Sedimentary Om and Fe In The Umentioning

confidence: 96%

Flocculation of dissolved organic matter controls the distribution of iron in boreal estuarine sediments

Jilbert¹,

Asmala²,

Schröder³

et al. 2017

Preprint

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Abstract. Iron (Fe) plays a key role in sedimentary diagenetic processes in coastal systems, participating in various redox reactions and influencing the burial of organic carbon. Large amounts of Fe enter the marine environment from boreal river catchments associated with dissolved organic matter (DOM). However, the fate of this Fe pool in estuarine sediments has not been extensively studied. Here we show that flocculation of DOM along salinity gradients in an estuary of the northern Baltic Sea efficiently transfers Fe from the dissolved phase into particulate material that accumulates in the sediments. Consequently, 5we observe a decline with distance offshore in both the Fe content of the sediments and proportion of terrestrial material in the sedimentary organic matter pool. Mössbauer spectroscopy and sequential extractions suggest that large amounts of Fe in sediments of the upper estuarine zone are associated with organic matter as unsulfidized Fe (II) complexes, or present in the form of ferrihydrite, implying a direct transfer of flocculated material to the sediments. Accordingly, the contribution of these components to the total sedimentary Fe declines with distance offshore while other Fe phases become proportionally more 10 important. Sediment core records show that the observed lateral distribution of Fe minerals has remained similar over recent decades, despite variable Fe inputs from anthropogenic sources and eutrophication of the coastal zone. Pore water data suggest that the vertical zonation of diagenetic processes in the sediments is influenced by both the availability of Fe and by bottom water salinity, which controls the availability of sulfate (SO4 2-).

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Reconsidering the Physics of the Chesapeake Bay Estuarine Turbidity Maximum

Cited by 144 publications

References 44 publications

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary

Spatio-Temporal Variations in Pathogenic Bacteria in the Surface Sediments of the Zuari Estuary, Goa, India

Flocculation of dissolved organic matter controls the distribution of iron in boreal estuarine sediments

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