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  • 1
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    Computer Graphics: On Data Compaction of Scanning Curves (1989)
    Oxford University Press
    Details
    Publication Date: 1989-12-01
    Print ISSN: 0010-4620
    Electronic ISSN: 1460-2067
    Topics: Computer Science
    Published by Oxford University Press
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  • 2
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    The Thorne Glacier Section of the Queen Maud Mountains (1937)
    Wiley
    Details
    Publication Date: 1937-10-01
    Print ISSN: 0016-7428
    Electronic ISSN: 1931-0846
    Topics: Geography
    Published by Wiley
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  • 3
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    Contemporary systematics of vadose zone nitrate capture by speleothem carbonate (2021)
    Elsevier
    Details
    Publication Date: 2021-03-01
    Print ISSN: 0009-2541
    Electronic ISSN: 1872-6836
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Elsevier
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  • 4
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    River Leven (at Newby Bridge) freeze coring report (2021)
    Lancaster Universtiy | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10958 | 1256 | 2013-03-26 13:55:54 | 10958 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the River Leven (at Newby Bridge) freeze coring report produced by Lancaster University in 2000. This study looks at fine materials in river Leven that may have to be considered detrimental to successful salmonid spawning. Following an observed decline in quality of salmonid fisheries at the site an investigation was initiated to assess the extent of ingress of fine sediments into the spawning gravels. A broader picture was sought by sampling both above and below the weir and close to both banks of the river. A comparison of the fine sediment from each sample site was undertaken. All the freeze cores used in this report contained distinct horizontal strata down through their length. The cores often penetrated into a highly compacted layer of light grey coloured material. The upper surface of this highly compacted layer is considered as a boundary between fine materials of different origin. Considerable variability was observed in the median grain size (D50) of the gravels from the cores. In addition variability was observed in the thickness of the upper less compacted layers. The role of regulated river flow across the weir in clearing fines from river gravels is briefly considered.
    Description: Environment Agency Archives North West
    Description: +appendices
    Keywords: Fisheries ; Limnology ; Management ; England ; Leven ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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  • 5
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    River Leith fluvial aufit. Final project report (2021)
    Lancaster University | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11094 | 1256 | 2013-03-29 14:14:20 | 11094 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the River Leith fluvial audit: Final project report produced by Lancaster University in 1998. Freeze cores extracted from the upper and lower ends of River Leith illustrate that the bed is highly compacted in the downstream reach. Fine material is locally derived from bedrock at depths of only 32 cms into the bed and in one core fine material is 66% of the extracted core. Levels of fines that are believed to be detrimental to fish are put at 20 to 30%. Reduced flow and stream power from water abstraction may lead to a greater infiltration of fine material if gravels are not regularly flushed through with flood flows. Infiltration of fine material can lead to river bed compaction and concretion. A small abstraction may have no effect on the morphology of a river if the reduced discharge is within the normal range of flows experienced. However if the impact on flows is small it is still possible that fine sediment problems will develop progressively and the effects may not be noticed for several years.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Limnology ; Management ; England ; River Leith ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Fine material ; Pollution effects ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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  • 6
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    River Crake (at Bouthrey Bridge) freeze coring report (2021)
    Lancaster University | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10959 | 1256 | 2013-03-26 13:55:44 | 10959 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the River Crake (at Bouthrey Bridge) freeze coring report produced by Lancaster University in 1999. This study looks at fine materials in river Crake at Bouthrey Bridge that may have to be considered detrimental to successful salmonid spawning. Following an observed decline in quality of salmonid fisheries at the site an investigation was initiated to assess the extent of ingress of fine sediments into the spawning gravels. Fine sediments from one potential source, upstream riverbanks, are also compared to those isolated from the spawning gravels. The percentage by weight of fine sediments for the six freeze cores, was found to be lower than first expected, given the visual appearance of the reach. However the fines were found to be distributed evenly down the cores with a marked absence of an upper, coarse gravel armour layer. In addition the median grain size (D50) of the six samples was generally low, falling to 6mm for core 5. The low median grain size and the absence of coarse grained upper strata are considered detrimental to the success rate of salmonid spawning.
    Description: Environment Agency Archives North West
    Description: +appendices
    Keywords: Fisheries ; Limnology ; Management ; England ; Crake ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 8
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