Stable isotope tracers of shallow groundwater recharge dynamics and mixing within an Icelandic sandur, Skeiarársandur

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Authors

External organisations

  • Keele University
  • British Geological Survey

Abstract

Stable isotope (δ18O, δD) tracers are used to investigate the temporal and spatial distribution of groundwater recharge sources, flow patterns and mixing processes within a proglacial outwash plain aquifer at Skeiarársandur, southeast Iceland. There are two principal and isotopically-distinct groundwater recharge sources: glacier/ice melt and local precipitation, and a third minor recharge source of lake water. Shallow groundwater typically becomes isotopically heavier with decreasing depth and increasing distance from the glacier margin. This trend varies spatially and temporally due to the superimposition of a number of factors. The proportions of different recharge sources and evolution of the isotope composition of shallow groundwater are controlled by: (1) proximity to spatially restricted recharge sources (icemelt, surface water bodies); (2) groundwater depth; (3) vertical flow patterns controlling the extent of mixing; (4) recharge dynamics in response to local precipitation events; (5) connection to localised flow systems; and (6) seasonal mixing processes through cryogenic turnover.

Details

Original languageEnglish
Title of host publicationIAHS-AISH Publication
Publication statusPublished - 2009
EventSymposium: Hydrology in Mountain Regions: Observations, Processes and Dynamics - 14th General Assembly of the IUGG - Perugia, Italy
Duration: 2 Jul 200713 Jul 2007

Conference

ConferenceSymposium: Hydrology in Mountain Regions: Observations, Processes and Dynamics - 14th General Assembly of the IUGG
CountryItaly
CityPerugia
Period2/07/0713/07/07

Keywords

  • Deuterium, Groundwater, Iceland, Isotopes, Outwash plain, Oxygen-18, Recharge, Sandur

ASJC Scopus subject areas