Sediment redistribution following wildfire in the Sydney region, Australia

a mineral magnetic tracing approach

William Blake, Peter Wallbrink, Stefan Doerr, Richard Shakesby, Geoffrey Humphreys

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

    8 Citations (Scopus)

    Abstract

    Increased sediment and nutrient fluxes arising after wildfires may affect downstream water quality. We use mineral magnetic tracers to elucidate linkage between different slope units, river channel and a reservoir sediment column in the gorge-dissected landscape of a burnt water supply basin. Comparison of magnetic properties of source areas with downstream (sub-aerially stored) channel deposits Suggests predominantly ridge-top origin with significant storage of sediment within footslopes. Magnetic properties of the sediment column provide insight into the nature of sediment accumulation on the reservoir floor and the role of immediate post-fire rainfall events. Comparison of source signatures with sub-aqueously stored sediment is complicated by the apparent fragility of some fine pyrogenic mineral grains; these may have to be accounted for in sediment column interpretation. Tracing tools provide river basin managers with important process-based evidence of post-fire sediment redistribution, useful for more effective mitigation of these infrequent, but significant, sediment redistribution events.
    Original languageEnglish
    Title of host publicationSediment transfer through the fluvial system. IAHS
    EditorsValentin Golosov, Vladimir Belyaev, Des E. Walling
    Place of PublicationWallingford, UK
    PublisherIAHS Press
    Pages52-59
    Number of pages8
    ISBN (Print)1901502578
    Publication statusPublished - 2004
    EventSediment transfer through the fluvial system - Moscow, Russian Federation
    Duration: 2 Aug 20046 Aug 2004

    Conference

    ConferenceSediment transfer through the fluvial system
    CountryRussian Federation
    CityMoscow
    Period2/08/046/08/04

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