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    Anthropogenic land subsidence in the Perth Basin: Challenges for its retrospective geodetic detection

    186443_63589_PerthSink10a.pdf (447.6Kb)
    Access Status
    Open access
    Authors
    Featherstone, Will
    Filmer, Michael
    Penna, N.
    Morgan, L.
    Schenk, A.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Featherstone, W.E. and Filmer, M.S. and Penna, N.T. and Morgan, L.M. and Schenk, A. 2012. Anthropogenic land subsidence in the Perth Basin: Challenges for its retrospective geodetic detection. Journal of the Royal Society of Western Australia. 95 (1): pp. 53-62.
    Source Title
    Journal of the Royal Society of Western Australia
    ISSN
    0035-922X
    URI
    http://hdl.handle.net/20.500.11937/14837
    Collection
    • Curtin Research Publications
    Abstract

    Recent-past subsidence of parts of the Perth Basin has most probably been caused by increased groundwater extraction for domestic and agricultural use. However, no dedicated geodetic monitoring programs were established when the increased extraction began in around 2000, thus setting a challenge to retrospectively quantify and map the subsidence. Differential levelling is likely to be less effective as only a few repeat traverses cover the areas thought to be subsiding. Repeat gravimetry is totally ineffective because of microseismic vibrations propagating through the Perth Basin. Repeat episodic GPS (Global Positioning System) is also likely to be less effective because of the few station occupations over several days or weeks and the inherent weakness of GPS for height determination. However, from a continuously operating GPS receiver at Gnangara and nearby artesian monitoring boreholes, we show that the rate of land subsidence has slowed from about -6 mm/yr to about -2 mm/yr since the reduction of groundwater extraction from the Yarragadee Aquifer in around 2005. A promising technique is InSAR (interferometric synthetic aperture radar) because it can map large areas, but the lack of historical radar imagery over the period of increased subsidence is a hindrance.

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