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    Unsaturated zone travel time to groundwater on a vulnerable site

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    Richards Travel time to groundwater ...
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    Author
    Richards, Karl G.
    Coxon, Catherine E.
    Ryan, Michael
    Keyword
    bromide tracing
    preferential flow
    dual porosity
    travel time
    groundwater vulnerability
    Karst
    Fermoy
    Date
    2005
    
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    URI
    http://hdl.handle.net/11019/191
    Citation
    Karl Richards, Catherine E. Coxon & Michael Ryan (2005): Unsaturated zone travel time to groundwater on a vulnerable site, Irish Geography, 38:1, 57-71
    Abstract
    A bromide (Br) tracing experiment was conducted to ascertain unsaturated zone travel time to groundwater on a site with a karstified limestone aquifer overlain by a thin free-draining overburden. Br tracer was applied to areas surrounding two boreholes; soil solution and groundwater Br concentrations were monitored. Bromide was first detected after eight and 34 days in the soil solution and groundwater. The quick break-through of the applied Br in the soil solution and groundwater indicates the presence of preferential flow in the soil at this site. The time to maximum groundwater Br concentration supports a dominant matrix flow path through the overburden and then preferential flow through the unsaturated limestone bedrock. The results indicated that the transport of conservative contaminants, such as nitrate, can be expected to occur in a single recharge season. The occurrence of preferential flow raises concerns over rapid transport of non-conservative contaminants such as faecal coliforms and this merits further investigation.
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1080/00750770509555849
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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