Groundwater recharge and flow on Montserrat, West Indies: Insights from groundwater dating

Brioch Hemmings*, Daren Gooddy, Fiona Whitaker, W. George Darling, Alia Jasim, Joachim Gottsmann

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

Study region: Montserrat, Lesser Antilles, Caribbean. Study focus: Analysis of δ<sup>2</sup>H and δ<sup>18</sup>O isotopes, and chlorofluorocarbon (CFC) anthropogenic tracers in Montserrat groundwater provides insights into the age and provenance of the spring waters. New hydrological insights: δ<sup>2</sup>H and δ<sup>18</sup>O analysis indicates uniform recharge elevations for groundwaters on Montserrat. CFC-11 and CFC-12 analysis reveals age differences between isotopically similar, high elevation springs and low elevation aquifer waters. Low CFC concentrations within a confined low elevation aquifer suggest water ages of ~45 years. High CFC concentrations in the northern and western springs are explained by rapid infiltration of cool (high CFC concentration) rainfall into saturated compartments, with flow through the vadose zone to the phreatic zone dominated by compartment flow. Lower CFC concentrations in a number of aligned warmer springs suggest a contribution from older, warmer waters from depth. Temperatures and CFC concentrations indicate older component supply rates of up to 8L/s to the highest yielding spring on Centre Hills, with contributions of up to 75% in the warmest spring waters.

Original languageEnglish
Article number123
Pages (from-to)611-622
Number of pages12
JournalJournal of Hydrology: Regional Studies
Volume4
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • CFC
  • Groundwater dating
  • Groundwater mixing
  • Island hydrogeology
  • Isotope
  • Springs
  • Volcanic island

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