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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/191

Title: Unsaturated zone travel time to groundwater on a vulnerable site
Authors: Richards, Karl G.
Coxon, Catherine E.
Ryan, Michael
Keywords: bromide tracing
preferential flow
dual porosity
travel time
groundwater vulnerability
Issue Date: 2005
Publisher: Taylor & Francis
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
Series/Report no.: Irish Geography;vol. 38
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.
Description: peer-reviewed
This is an electronic version of an article published in Irish Geography, 2005, vol.38(1), pp57-71. Irish Geography is available online at: http://www.tandfonline.com/doi/pdf/10.1080/00750770509555849. For the avoidance of doubt, ‘your version’ is the author version and not the publisher-created PDF, HTML or XML version posted as the definitive, final version of scientific record.
URI: http://hdl.handle.net/11019/191
ISSN: 0075-0778
Appears in Collections:Environment, Soils & Land Use

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