Impacts of climate change on groundwater in Australia: a sensitivity analysis of recharge

James McCallum, Russell Crosbie, G Walker, W Dawes

    Research output: Contribution to journalArticle

    63 Citations (Scopus)

    Abstract

    Groundwater recharge is a complex process reflecting many interactions between climate, vegetation and soils. Climate change will impact upon groundwater recharge but it is not clear which climate variables have the greatest influence over recharge. This study used a sensitivity analysis of climate variables using a modified version of WAVES, a soil-vegetation-atmosphere-transfer model (unsaturated zone), to determine the importance of each climate variable in the change in groundwater recharge for three points in Australia. This study found that change in recharge is most sensitive to change in rainfall. Increases in temperature and changes in rainfall intensity also led to significant changes in recharge. Although not as significant as other climate variables, some changes in recharge were observed due to changes in solar radiation and carbon dioxide concentration. When these variables were altered simultaneously, changes in recharge appeared to be closely related to changes in rainfall; however, in nearly all cases, recharge was greater than would have been predicted if only rainfall had been considered. These findings have implications for how recharge is projected to change due to climate change.

    Original languageEnglish
    Pages (from-to)1625-1638
    Number of pages14
    JournalHydrogeology Journal
    Volume18
    Issue number7
    DOIs
    Publication statusPublished - 2010

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