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    Assessment of a rapid method for quantitative reach-scale estimates of deposited fine sediment in rivers 
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    Assessment of a rapid method for quantitative reach-scale estimates of deposited fine sediment in rivers

    Volume
    230
    Pagination
    37 - 50
    Publisher
    Elsevier
    DOI
    10.1016/j.geomorph.2014.11.003
    ISSN
    0169-555X
    Metadata
    Show full item record
    Abstract
    Despite increasing concerns about the negative effects that increased loads of fine-grained sediment are having on freshwaters, the need is clear for a rapid and cost-effective methodology that gives precise estimates of deposited sediment across all river types and that are relevant to morphological and ecological impact. To date few attempts have been made to assess the precision of techniques used to assemble data on fine sediment storage in river channels. Accordingly, we present an investigation into the sources of uncertainty associated with estimates of deposited fine-grained sediment in rivers using a sediment resuspension technique, an approach that provides an instantaneous measure of deposited fine sediment (surface and subsurface) in terms of quantity and quality. We investigated how variation associated with river type, spatial patchiness within rivers, sampling, and individual operators influenced estimates of deposited fine sediment using this approach and compared the precision with that of visual estimates of river bed composition - a commonly applied technique in rapid river surveys. We have used this information to develop an effective methodology for producing reach-scale estimates with known confidence intervals. By using a spatially-focussed sampling strategy that captured areas of visually high and low deposition of fine-grained sediment, the dominant aspects of small-scale spatial variability were controlled and a more precise instantaneous estimate of deposited fine sediment derived. The majority of the remaining within-site variance was attributable to spatial and sampling variability at the smallest (patch) scale. The method performed as well as visual estimates of percentage of the river bed comprising fines in its ability to discriminate between rivers but, unlike visual estimates, was not affected by operator bias.Confidence intervals for reach-scale measures of deposited fine-grained sediment were derived for the technique, and these can be applied elsewhere.
    Authors
    Duerdoth, CP; Arnold, A; Murphy, JF; Naden, PS; Scarlett, P; Collins, AL; Sear, DA; Jones, JI
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/7779
    Collections
    • School of Biological and Chemical Sciences [1659]
    Language
    eng
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