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  • Articles  (4)
  • River floodplains  (2)
  • desorption  (2)
  • Springer  (4)
  • 1995-1999  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Spatial Variability of the Particle Size Composition of Overbank Floodplain Deposits (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 71-80 
    Details
    ISSN: 1573-2932
    Keywords: River floodplains ; overbank sedimentation ; floodplain deposits ; grain size composition ; spatial variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An important feature of overbank floodplain deposits is the spatial variability of their particle size composition. Analysis of such spatial variability can assist in developing an improved understanding of the transport and deposition of suspended sediment on river floodplains during overbank flood events, in investigating the fate of sediment-associated contaminants and in calibrating existing floodplain sediment deposition models. The study reported in this paper investigates the spatial variability of the grain size composition of overbank floodplain deposits at different spatial scales, through analysis of surface sediment samples collected from frequently inundated floodplain sites on the Rivers Culm, Stour and Severn in the UK. Significant lateral and downstream variations in the grain size composition of the sediment deposits have been documented at the study sites, and the results obtained have been interpreted in terms of the processes governing overbank floodplain flow and sediment transport and deposition, which are influenced by a number of factors including floodplain geometry and topography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018367912866
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial variability of the particle size composition of overbank floodplain deposits (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 71-80 
    Details
    ISSN: 1573-2932
    Keywords: River floodplains ; overbank sedimentation ; floodplain deposits ; grain size composition ; spatial variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An important feature of overbank floodplain deposits is the spatial variability of their particle size composition. Analysis of such spatial variability can assist in developing an improved understanding of the transport and deposition of suspended sediment on river floodplains during overbank flood events, in investigating the fate of sediment-associated contaminants and in calibrating existing floodplain sediment deposition models. The study reported in this paper investigates the spatial variability of the grain size composition of overbank floodplain deposits at different spatial scales, through analysis of surface sediment samples collected from frequently inundated floodplain sites on the Rivers Cuhn, Stour and Severn in the UK. Significant lateral and downstream variations in the grain size composition of the sediment deposits have been documented at the study sites, and the results obtained have been interpreted in terms of the processes governing overbank floodplain flow and sediment transport and deposition, which are influenced by a number of factors including floodplain geometry and topography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406846
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    the effect of phosphate on the transformation of ferrihydrite into crystalline products in alkaline media (1997)
    Springer
    Water, air & soil pollution 97 (1997), S. 397-412 
    Details
    ISSN: 1573-2932
    Keywords: desorption ; ferrihydrite ; modelling ; phosphate ; TEM ; transformation ; wastewater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The presence of phosphate retards the transformation of ferrihydrite into crystalline products. Increasing phosphate from 0 to 1 mole % results in an order of magnitude decrease in the rate of transformation of ferrihydrite at pH 12. Levels of phosphate of ∼1 mol % suppress the formation of goethite (α-FeO(OH)) and result in the formation of a product consisting of η-Fe2O3. Higher levels of phosphate result in the ferrihydrite remaining amorphous, even after several hundred hours. Phosphate prevents formation of goethite by hindering the dissolution of ferrihydrite rather than by interfering with nucleation and growth of goethite in solution. The transformation rate of pure ferrihydrite is also strongly inhibited in the presence of dissolved phosphate. This is due to surface complexation. The transformation rate was measured at temperatures of 60 °C and 70 °C. The rate of transformation was found to be described by either (i) a solid-state reaction equation for powdered compacts or (ii) a zero-order reaction controlled by desorption. The transformation of the ferrihydrite matrix was accompanied by the loss of the phosphate trace component. X-ray diffraction indicates that no solid solution involving phosphate substitution into η-Fe2O3 is formed. Transmission electron microphotographs of the original precipitates containing phosphate confirm the presence of the phosphate and demonstrate its involvement in linking together extremely small particles of ferrihydrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026416426611
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of phosphate on the transformation of ferrihydrite into crystalline products in alkaline media (1997)
    Springer
    Water, air & soil pollution 97 (1997), S. 397-412 
    Details
    ISSN: 1573-2932
    Keywords: desorption ; ferrihydrite ; modelling ; phosphate ; TEM ; transformation ; wastewater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The presence of phosphate retards the transformation of ferrihydrite into crystalline products. Increasing phosphate from 0 to 1 mole % results in an order of magnitude decrease in the rate of transformation of ferrihydrite at pH 12. Levels of phosphate of ∼1 mol % suppress the formation of goethite (α-FeO(OH)) and result in the formation of a product consisting ofη-Fe2O3. Higher levels of phosphate result in the ferrihydrite remaining amorphous, even after several hundred hours. Phosphate prevents formation of goethite by hindering the dissolution of ferrihydrite rather than by interfering with nucleation and growth of goethite in solution. The transformation rate of pure ferrihydrite is also strongly inhibited in the presence of dissolved phosphate. This is due to surface complexation. The transformation rate was measured at temperatures of 60 °C and 70 °C. The rate of transformation was found to be described by either (i) a solid-state reaction equation for powdered compacts or (ii) a zero-order reaction controlled by desorption. The transformation of the ferrihydrite matrix was accompanied by the loss of the phosphate trace component. X-ray diffraction indicates that no solid solution involving phosphate substitution intoη-Fe2O3 is formed. Transmission electron microphotographs of the original precipitates containing phosphate confirm the presence of the phosphate and demonstrate its involvement in linking together extremely small particles of ferrihydrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407475
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    Paper (German National Licenses)
    Fulltext
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