Minor elements in sediments of Great Bay estuary, New Hampshire

Armstrong, Peter B.; Hanson, Gary M.; Gaudette, Henri E.

doi:10.1007/bf02407507

Cited by 22 publications

(3 citation statements)

References 9 publications

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“…Carbonates are insol- uble at high pH and Eh values and hence the metals content of the carbonate debris are stable under such redox conditions. The strong positive loadings on mud (silt and clay), organic carbon, iron and manganese metals indicate the close relationship of these components in the studied marine environment as observed by many authors (Gibbs, 1973, Armstrong et al, 1976, Rifaat et al, 1992and El-Sayed et al, 2002. The inverse relationship between these components and both pH and Eh values indicates that the decay of organic matter tends to lower pH of the sediments, but not far below pH 7.35 and consumes the oxygen, and hence lowers the Eh too.…”

Section: Resultssupporting

confidence: 72%

Mineralogy and Provenance of Ash Shuqayq Coastal Sediments, Southern Red Sea, Kingdom of Saudi Arabia

Gheith¹,

Al-Washmi²,

Nabhan³

2005

mar

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A detailed mineralogical investigation was carried out on recent sediments from the different geomorphic environments at the Ash Shuqayq coastal area in the southern Red Sea. Ash Shuqayq coast is considered as a low-lying plain where sediment cover is generally thick and the distribution of the littoral sediments on the shoreface provide important information regarding not only the sources of the sediments but also the modes and pathways of transport. Polarizing microscope and XRD analyses were used to study heavy and light mineral fractions, bulk and clay mineral assemblages respectively. Mineral identification and provenance as well as sediment movement are established. Important conclusions concerning the influence of geology and coastal morphology on sediment distribution and transport along Ash Shuqayq shorelines are documented.The distribution pattern of heavy minerals in Ash Shuqayq coastal environments shows their selective deposition with respect to their densities, sorting and winnowing processes prior to being deposited on the beach. On the other hand, the crescentic shape of the coastline and the occurrence of wadis play a considerable role enrichment of the beach by heavy minerals. Mica and carbonate minerals tend to accumulate in the deeper water (non-agitated areas) far from the shore.

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Section: Resultssupporting

confidence: 72%

Mineralogy and Provenance of Ash Shuqayq Coastal Sediments, Southern Red Sea, Kingdom of Saudi Arabia

Gheith¹,

Al-Washmi²,

Nabhan³

2005

mar

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“…En général, il a été montré que les métaux sont essentiellement liés à la phase organique et argileuse des sédiments (Bloom et Ayling, 1977;Martin et Meybeck, 1979). Plus le sédiment est fin, plus il est riche en métaux traces (Amstrong et al, 1976;Loring, 1976). Gnandi et Tobschall (1999a) ont montré que les concentrations en Cr, Cu, Ni et Zn augmentent lorsque la taille des grains diminue dans les sédiments marins de la côte togolaise.…”

Section: Discussionunclassified

Métaux lourds (Cu, Cr, Mn et Zn) dans les sédiments de surface d’une lagune tropicale africaine : cas de la lagune Ebrie (Côte d’Ivoire)

Soro¹,

Metongo²,

Soro³

et al. 2010

International Journal of Biological and Chemical Sciences

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Les sédiments de la lagune Ebrié (Côte d'Ivoire) ont été étudiés en vue de déterminer leur degré de pollution par les métaux lourds. L'étude a consisté à déterminer les métaux lourds (Cr, Cu, Mn et Zn) au niveau des sédiments superficiels par spectrophotomètre d'absorption atomique VARIAN 1275 AA. Les données ont été analysées par les méthodes d'Analyse en Composantes Principales (ACP) et l'Index de géo-accumulation afin de connaître l'origine, les zones sensibles et les variables responsables de cette pollution. Les concentrations en métaux varient en fonction de la granulométrie du sédiment pour le cuivre, le zinc et le chrome à l'exception du manganèse. La zone d'étude est divisée en deux secteurs en fonction des valeurs de l'index de géo-accumulation du cuivre et du zinc qui varie de 0 à 1. Les parties Est et Ouest ont un index nul alors que la partie centrale qui regroupe les baies a un index compris entre 0 et 1. Ces différentes baies (Banco, Biétry, Cocody et Marcory) sont les réceptacles des effluents urbains, industriels et des eaux de ruissellement de la ville d'Abidjan. Les teneurs élevées en Cu, Cr et Zn dans les sédiments de ces baies sont dues à une pollution d'origine anthropique.

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“…Because of strong tidal currents, the bottom sediments of the main channel of the Great Bay Estuarine System consist mainly of coarse sands and gravel [ Armstrong et al , 1976]. Thus bed load transport is an important mechanism of sediment movement.…”

Section: Simulationsmentioning

confidence: 99%

Simulation of the Great Bay Estuarine System: Tides with tidal flats wetting and drying

Erturk¹

2002

J.‐Geophys.‐Res.

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[1] Realistic lunar tides of the Great Bay Estuarine System have been simulated using a fixed boundary finite element numerical model as described by Ip et al. [1998]. It is a two-dimensional, nonlinear, time-stepping model with a groundwater component coupled to a kinematic force balance to facilitate the realistic drainage and filling of elements during ebb and flood, respectively. The numerical model reproduces the observed M 2 tides as described by Swift and Brown [1983], and it successfully captures qualitatively correct residual currents and transports, realistic massconserving flooding and dewatering of the tidal flats, and current asymmetry between flood and ebb. The simulation results were sensitive to local bathymetry and the implemented friction law. The accuracy of the model is demonstrated by comparison with the 1975 Great Bay study [Swift and Brown, 1983] in terms of tidal elevations at 14 tidal stations and 4 cross-sectionally averaged current measurements in the estuary. Quantitatively, the model results show good agreement with observations, displaying correlation coefficients of !0.96 in surface elevation and !0.95 in averaged current, with average RMS errors of 0.12 m and 0.26 m s À1 , respectively. In addition, tidal flat hydrodynamics, characteristic distributions of residual current, sediment bed load transport, and influence of topography on the overall circulation in the region are also discussed.

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Minor elements in sediments of Great Bay estuary, New Hampshire

Cited by 22 publications

References 9 publications

Mineralogy and Provenance of Ash Shuqayq Coastal Sediments, Southern Red Sea, Kingdom of Saudi Arabia

Mineralogy and Provenance of Ash Shuqayq Coastal Sediments, Southern Red Sea, Kingdom of Saudi Arabia

Métaux lourds (Cu, Cr, Mn et Zn) dans les sédiments de surface d’une lagune tropicale africaine : cas de la lagune Ebrie (Côte d’Ivoire)

Simulation of the Great Bay Estuarine System: Tides with tidal flats wetting and drying

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