Cryosuction

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Cryosuction is concept of negative pressure in freezing soil resulting from transformation of liquid water to ice in the soil pores whereby water migrates through soil pores to the freezing zone (through capillary action).[1] [2] Fine-grained soils such as clays and silts enables greater negative pressures than more coarse-grained soils due to the smaller pore size. In periglacial environments, this mechanism is highly significant and it is the predominant process in ice lens formation in permafrost areas.[3] Several models for ice-lens formation by cryosuction exist, among others the Hydrodynamic model and the Pre-melting model, many of them based on the Clausius–Clapeyron relation with various assumptions, yielding cryosuction potentials of 11 to 12 atm per degree Celsius below zero depending on pore size.[4]

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References[edit]

  1. ^ Williams, P.J.; M.W. Smith (1991). "The Frozen Earth: Fundamentals of Geocryology". Polar Record 27 (163): 370. doi:10.1017/S0032247400013231. Retrieved 2010-05-31. 
  2. ^ Hohmann, Maria (March 1997). "Soil freezing -- the concept of soil water potential. State of the art". Cold Regions Science and Technology 25 (2): 101–110. doi:10.1016/S0165-232X(96)00019-5. ISSN 0165-232X. Retrieved 2010-05-31. 
  3. ^ Doré, Guy (2004). "Development and Validation of the Thaw-weakening Index". International Journal of Pavement Engineering 5 (4): 185. doi:10.1080/10298430412331317464. ISSN 1029-8436. Retrieved 2010-05-31. 
  4. ^ Davis, Neil (2001). Permafrost: A Guide to Frozen Ground in Transistion. University of Alaska Press. p. 351. ISBN 1-889963-19-4.