SOIL TEMPERATURES, A REVIEW OF PUBLISHED RECORDS

SOIL TEMPERATURE VARIATIONS ARE STUDIED BY THE DIVISION OF BUILDING RESEARCH OF THE NATIONAL RESEARCH COUNCIL OF CANADA BECAUSE OF THEIR ECONOMIC IMPORTANCE IN MANY FIELDS OF ENGINEERING. AN EXTENSIVE REVIEW IS REPORTED OF THE LITERATURE. A BRIEF HISTORICAL REVIEW SHOWS THAT THE ECONOMIC IMPORTANCE OF A STUDY OF SOIL TEMPERATURES IS CLEARLY SHOWN IN ENGINEERING LITERATURE. THE INTRINSIC FACTORS WHICH MOST OFTEN BECOME UNBALANCED AND CAUSE TEMPERATURE DIFFERENCES ARE: (1) LATENT HEAT OF FUSION OF ICE, (2) LATENT HEAT OF EVAPORATION OF WATER, (3) GROUND SURFACE COVER, (4) GROUND SURFACE COLOR, AND (5) TOPOGRAPHIC POSITION. THESE FACTORS ARE DISCUSSED. DOMINATING ALL INTRINSIC FACTORS WHICH AFFECT SOIL-TEMPERATURE VARIATION IS THE MOISTURE CONTENT OF THE SOIL. AS STUDIES OF THIS MATTER HAVE PROGRESSED, IT BECAME CLEAR THAT THE WATER PRESENT IN SOIL AFFECTS INTERNAL HEAT FLOW IN A MUCH MORE COMPLEX MANNER THAN ITS PRESENCE MIGHT ORDINARILY SUGGEST. THE FULL IMPLICATIONS OF THE DYNAMICS OF MOISTURE-VAPOR MOVEMENT IN RELATION TO SOIL TEMPERATURES ARE STILL TO BE INVESTIGATED, AND THIS DIRECTS ATTENTION TO THE SIGNIFICANT OMISSION FROM ALMOST ALL RECORDS OF ANY REFERENCE TO THE POSITION OF THE GROUND-WATER TABLE AT THE EXPERIMENTAL SITE. OF EQUAL SIGNIFICANCE IS THE ALMOST COMPLETE NEGLECT OF THE DENSITY OR STATE OF COMPACTION OF THE SOILS IN WHICH RECORDS WERE TAKEN. THE ROLE OF THESE FACTORS DEPENDS TO A LARGE EXTENT ON THE FULL UNDERSTANDING OF FROST ACTION IN SOIL.

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  • Accession Number: 00237837
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 14 1970 12:00AM