Temperature dependence of unfrozen water content in sediments on the water potential measurements

V. A. Istomin, E. M. Chuvilin, N. A. Makhonina, B. A. Bukhanov

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The procedure of thermodynamic calculation of pore water phase state in sediments at subzero temperatures Celsius is based on experimental data on pore water potential, obtained at positive temperatures. Proposed exact thermodynamic relationships permitt calculation of the unfrozen water content in sediments taking into account the external (gas) pressure influence, and estimation of the equilibrium "pore water-gas-gas hydrate" for definition of non-clathrated water content in sediments depending on temperature and pressure. An express-method of definition of unfrozen water content in sediments by water potential is developed. Analysis of experimental data on pore water potential of various sediments has demonstrated that it is expedient to consider the pore water enthalpy distinction from volumetric water enthalpy in "dry" sediments. Unfrozen water content in the range of subzero temperatures is calculated for kudinovskaya clay, using data on pore water potential. Calculation data are in good agreement with experimental data obtained by the contact method.

Original languageEnglish
Pages (from-to)35-43
Number of pages9
JournalEarth's Cryosphere
Volume13
Issue number2
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Frozen sediment
  • Ice
  • Phase equilibrium
  • Pore water potential
  • Thermodynamics of pore water
  • Unfrozen water

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