THE ROLE OF GROUND HEAT IN LIMITING FROST PENETRATION

Values of the upward heat flow to the frost line are taken into account in calculations of frost penetration depths. The initial stages are reported in a regional assessment of the upward heat flow to the frost line, in which basic material was obtained from a network of stations established 15 years ago. Temperature observations were taken daily at depths of 5, 10, 20, 50 100, 150 and 300 cm for approximately 50 stations. The heat flow was determined by a combination of the thermal conductivity method and the heat capacity method. The procedures followed in the preparation of temperature data and determinations of volumetric heat capacity and detailed. An equation is presented which was used to determine the upward heat flow at four sites. The climatic data for these sites are tabulated as well as the soil thermal properties. The heat flows are of a magnitude that is highly important in relation to frost penetration. When freezing occurs, there is a substantial increase in heat flow from the affected soil layer. This is related to the release of latent heat and the consequent greater temperature gradients in the frozen soil. The different upward heat flows observed at the 4 locations, and their variation through the winter, when considered in relation to climatic parameters, lead to the conclusion that soil thermal properties are very important. It is the soil moisture content that primarily determines thermal properties, and because the soils at the 4 sites are texturally similar, it is concluded that the moisture content and thus thermal properties are largely determined by the climatic factor of rainfall.

  • Supplemental Notes:
    • Symposium on Frost Action on Roads, Paris (1973).
  • Corporate Authors:

    Organisation for Economic Co-operation and Development (OECD)

    2, rue André Pascal
    Paris,   France  75775 Paris Cedex 16
  • Authors:
    • Joynt, M I
    • Williams, P J
  • Conference:
  • Publication Date: 1973-10

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 189-203
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00260037
  • Record Type: Publication
  • Report/Paper Numbers: Conf Paper
  • Files: TRIS
  • Created Date: Sep 30 1974 12:00AM