Improved regional groundwater flow modelling using geochemical and isotopic constraints

A.A. Cronin, Y.S. Yang, R M Kalin

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

Abstract

Previous groundwater flow modelling of the Triassic Sherwood sandstone aquifer in Northern Ireland by Yang et al. (2000) highlighted uncertainties in the conceptual hydrogeological. model. Geochemical and isotopic sampling of groundwater was undertaken in the study area to better refine this conceptual model. Subsequent geochemical modelling provided useful insights into the recharge mechanisms occurring in the region. This work describes new flow modelling combining the findings from the previous flow modelling studies and geochemical/isotopic investigations. This incorporated alterations to the conceptual model and the use of 'soft data' to constrain a least-squares inverse modelling process. The new inverse modelling provided improved output from previous work. Recharge to the Lagan Valley was modelled as similar to 43,000 m(3)/d with groundwater flow velocities in the range 15 to 75 m/yr. Good correlation between MODPATH particle tracking travel times and geochemical residence times was achieved. This work highlights the importance of combining numerical flow modelling with geochemical/isotopic analysis in hydrogeology.
Original languageEnglish
Title of host publication New approaches characterizing groundwater flow
EditorsK.P. Seiler, S. Wohnlich
Place of PublicationLeiden
Pages283-287
Number of pages5
Volume1&2
Publication statusPublished - 2001
Event31st International-Association-of-Hydrogeologists Congress - Munich, Germany
Duration: 10 Sep 200114 Sep 2001

Conference

Conference31st International-Association-of-Hydrogeologists Congress
CountryGermany
CityMunich
Period10/09/0114/09/01

Keywords

  • improved
  • regional
  • groundwater flow
  • modelling
  • geochemical
  • isotopic
  • constraints

Cite this

Cronin, A. A., Yang, Y. S., & Kalin, R. M. (2001). Improved regional groundwater flow modelling using geochemical and isotopic constraints. In K. P. Seiler, & S. Wohnlich (Eds.), New approaches characterizing groundwater flow (Vol. 1&2, pp. 283-287).