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  • Modelling reach-scale variability in sediment mobility: An approach for within-reach prioritization of river rehabilitation works

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    Author(s)
    Hoyle, J
    Brooks, A
    Spencer, J
    Griffith University Author(s)
    Brooks, Andrew P.
    Year published
    2012
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    Abstract
    Many Australian river ecosystems have been, and continue to be, adversely affected by increased channel dimensions and sediment supplies occurring in the period since European settlement. One of the key aims of river rehabilitation in these rivers is to help reduce sediment yield by preventing ongoing bank erosion and remobilization of instream bed material stores. While various tools have been developed to help identify sediment sources at the catchment scale, this is often at a resolution that is too coarse to be translated directly to on-ground rehabilitation works, as most riverworks programs are designed and implemented ...
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    Many Australian river ecosystems have been, and continue to be, adversely affected by increased channel dimensions and sediment supplies occurring in the period since European settlement. One of the key aims of river rehabilitation in these rivers is to help reduce sediment yield by preventing ongoing bank erosion and remobilization of instream bed material stores. While various tools have been developed to help identify sediment sources at the catchment scale, this is often at a resolution that is too coarse to be translated directly to on-ground rehabilitation works, as most riverworks programs are designed and implemented at the reach or within-reach scale. This paper provides a method of prioritizing rehabilitation at the within-reach scale by using a high-resolution reach-scale modelling approach to examine the relative entrainment potential of sediment stores. The method has been developed for a 10 km reach of the upper Hunter River, NSW, Australia. Shear stress distribution is examined using the widely available model HEC-RAS, and incorporating a detailed, LiDAR-derived, representation of the in-channel vegetation into a spatially distributed Manning's roughness layer. At the geomorphic unit scale, the results highlight that the elevated 'bench' units, which represent significant stores of sand and silt, are much more vulnerable to remobilization than the lower elevation gravel bar units. At the sub-reach scale (500-2000 m) shear stresses are greatest in the most confined sections. While instream geomorphic heterogeneity has been significantly reduced in these locations, ongoing erosion is limited by bedrock and buried coarse gravel terrace material in the bed and banks. These results highlight the need for targeted rehabilitation strategies that account for within-reach variability in entrainment potential as well as on-the-ground knowledge of sediment supply and geological controls. Copyright # 2010 John Wiley & Sons, Ltd.
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    Journal Title
    Earth Surface Processes and Landforms
    Volume
    28
    Issue
    5
    DOI
    https://doi.org/10.1002/rra.1472
    Copyright Statement
    © 2010 John Wiley & Sons, Ltd. This is the pre-peer reviewed version of the following article: Modelling reach-scale variability in sediment mobility: An approach for within-reach prioritization of river rehabilitation works, Earth Surface Processes and Landforms, Early View (Articles online in advance of print), which has been published in final form at http://dx.doi.org/10.1002/rra.1472
    Subject
    Ecology
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/37191
    Collection
    • Journal articles

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