Buffers, barriers and blankets

the (dis)connectivity of catchment-scale sediment cascades

Kirstie A. Fryirs*, Gary J. Brierley, Nicholas J. Preston, Mio Kasai

*Corresponding author for this work

    Research output: Contribution to journalArticle

    332 Citations (Scopus)

    Abstract

    Catchment configuration and the nature of connectivity within and between landscape compartments affect the operation of sediment cascades and geomorphic responses to disturbance events of differing magnitude and frequency. This paper introduces the concept of landform impediments, termed buffers, barriers and blankets, that impede sediment conveyance by limiting the connectivity between landscape compartments. Buffers restrict sediment delivery to channels, barriers inhibit sediment movement along channels, and blankets drape channel or floodplain surfaces affecting the accessibility of sediment to entrainment. These features operate as a series of switches which turn on/off processes of sediment delivery, determining the effective catchment area at any given time. Using previously documented examples, the role of these features in affecting the operation of sediment cascades in a low relief, passive landscape setting such as the Australian landmass is contrasted to examples from high relief, uplifting settings in New Zealand. The Australian examples are further explored by examining how changes to landscape connectivity brought about by human disturbance since European settlement have impacted upon landscape sensitivity and prospects for river recovery. This approach to analysis of impediments to sediment conveyance is generic and can be applied in any environmental setting.

    Original languageEnglish
    Pages (from-to)49-67
    Number of pages19
    JournalCatena
    Volume70
    Issue number1
    DOIs
    Publication statusPublished - 1 Jun 2007

    Keywords

    • disconnectivity
    • decoupling
    • sediment cascades
    • sediment budgets
    • sensitivity
    • river recovery
    • switches

    Fingerprint Dive into the research topics of 'Buffers, barriers and blankets: the (dis)connectivity of catchment-scale sediment cascades'. Together they form a unique fingerprint.

    Cite this