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    Effects of climate and land use changes on groundwater resources in coastal aquifers

    135412_Ranjan_JEM_749-04.pdf (263.3Kb)
    Access Status
    Open access
    Authors
    Sarukkalige, Priyantha Ranjan
    Kazama, S.
    Sawamoto, M.
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Ranjan, S. Priyantha and Kazama, So and Sawamoto, Masaki. 2006. Effects of climate and land use changes on groundwater resources in coastal aquifers. Journal of Environmental Management. 80 (1): pp. 25-35.
    Source Title
    Journal of Environmental Management
    DOI
    10.1016/j.jenvman.2005.08.008
    ISSN
    03014797
    Faculty
    School of Engineering
    Department of Civil Engineering
    Faculty of Science and Engineering
    URI
    http://hdl.handle.net/20.500.11937/42433
    Collection
    • Curtin Research Publications
    Abstract

    To estimate the freshwater loss in coastal aquifers due to salinisation, a numerical model based on the sharp interface assumption has been introduced. The developed methodology will be useful in areas where limited hydrological data are available. This model will elaborate on the changes in fresh groundwater loss with respect to climate change, land use pattern and hydrologic soil condition. The aridity index has been introduced to represent the variations in precipitation and temperature. The interesting finding is that the deforestation leads to increase groundwater recharge in arid areas, because deforestation leads to reduce evapotranspiration even though it favors runoff. The combined climate and land use scenarios show that when the aridity index is less than 60, the agricultural lands give higher groundwater recharge than other land use patterns for all hydrologic soil conditions. The calculated recharge was then used to estimate the freshwater–saltwater interface and percentage of freshwater loss due to salinity intrusion. We found that in arid areas, the fresh groundwater loss increases as the percentage of forest cover increases. The combined effects of deforestation and aridity index on fresh groundwater loss show that deforestation causes an increase in the recharge and existing fresh groundwater resource in areas having low precipitation and high temperature (arid climates).

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