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The application of radioisotopes in the study of estuarine sedimentary processes
Clifton, R.J.; Hamilton, E.I. (1982). The application of radioisotopes in the study of estuarine sedimentary processes. Est., Coast. and Shelf Sci. 14(4): 433-446. https://dx.doi.org/10.1016/S0272-7714(82)80013-9
In: Estuarine, Coastal and Shelf Science. Academic Press: London; New York. ISSN 0272-7714; e-ISSN 1096-0015, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Americium
    ANE, British Isles, England
    British Isles, Scotland, North Esk R.
    Cesium
    Chemical elements > Metals > Heavy metals > Ruthenium
    Chemical elements > Nonmetals > Polonium
    Distribution
    Mixing
    Radionuclides
    Sedimentation
    Spatial distribution
    Transport > Sediment transport
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    Water bodies > Inland waters > Wetlands > Marshes > Salt marshes
    England [Marine Regions]; North Esk [Marine Regions]
    Marien/Kust; Brak water
Auteurs  Top 
  • Clifton, R.J.
  • Hamilton, E.I.
Abstract
    The use of radionuclide distributions and ratios as indicators of sedimentation and remixing processes within the Newbiggin area of the Esk estuary was investigated. It was demonstrated how, in conjunction with other physical and chemical characteristics of the sediments, these radionuclides may influence the ultimate fate of the non-conservative radioisotopes present in the region. The estuary is flanked by an emerging salt marsh and is a region exposed to a variety of radionuclides resulting from the activities of the British Nuclear Fuels Ltd. The dominant sediment of the area is a coarse grained sand resting on beds of indurated shingle. In the estuary, tidal movement of sediment results in the deposition of local areas of fine grained arenaceous silt on sands. The concentration of non-conservative radionuclides in surface sediments of the area cannot be described by a single parameter, but there is a high correlation of organic C, Cu, Al and the Si:Al ratio with particle size. The preservation of the historical record of the BNFL effluents in the Esk sediment is dependent on the hydrology of the area, which affects accretion, erosion, and remixing. Sedimentation rates at sites of accretion vary between 0.5 and 3 cm/year. However, at some sites they are much higher, about 6 cm/yr in the top 10 cm, but they are not consistent throughout the depth profiles. Some cores show evidence of continous accretion, but no significant radioactivity was detected at depths below 35-40 cm, indicating an overall sedimentation rate of about 1.5 cm/yr for the 25-30 yr period since BNFL effluents first entered the Irish Sea.
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