Groundwater flow with energy transport and water-ice phase change: Numerical simulations, benchmarks, and application to freezing in peat bogs

Jeffrey M. McKenzie, Clifford I. Voss, Donald I. Siegel

Research output: Contribution to journalArticle

140 Scopus citations

Abstract

In northern peatlands, subsurface ice formation is an important process that can control heat transport, groundwater flow, and biological activity. Temperature was measured over one and a half years in a vertical profile in the Red Lake Bog, Minnesota. To successfully simulate the transport of heat within the peat profile, the U.S. Geological Survey's SUTRA computer code was modified. The modified code simulates fully saturated, coupled porewater-energy transport, with freezing and melting porewater, and includes proportional heat capacity and thermal conductivity of water and ice, decreasing matrix permeability due to ice formation, and latent heat. The model is verified by correctly simulating the Lunardini analytical solution for ice formation in a porous medium with a mixed ice-water zone. The modified SUTRA model correctly simulates the temperature and ice distributions in the peat bog. Two possible benchmark problems for groundwater and energy transport with ice formation and melting are proposed that may be used by other researchers for code comparison.

Original languageEnglish (US)
Pages (from-to)966-983
Number of pages18
JournalAdvances in Water Resources
Volume30
Issue number4
DOIs
StatePublished - Apr 1 2007

Keywords

  • Benchmark
  • Cold regions
  • Energy transport
  • Freezing
  • Groundwater
  • Modelling
  • Peat

ASJC Scopus subject areas

  • Water Science and Technology

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