Accession Number : AD0660972

Title :   ON CALCULATING THE THERMOMETRIC CONDUCTIVITY COEFFICIENT AND HEAT FLUX IN SOIL ON THE BASIS OF AVERAGE TEMPERATURES,

Corporate Author : WEATHER BUREAU WASHINGTON D C

Personal Author(s) : Tseitin,G. Kh.

Report Date : JAN 1960

Pagination or Media Count : 18

Abstract : The thermometric conductivity coefficient, an index of the rate of temperature penetration in soil, varies with depth as a result of the vertical heteorogeneities of soil properties (porosity, moisture, phase states of water and others). In addition, the thermometric conductivity coefficient is also subject to variation owing to fluctuations of soil humidity. For this reason, a coefficient calculated on the basis of temperature data will be the mean for a given soil layer and for a given interval of time. Experience in calculations based on available formulas shows that the result, to a considerable degree, will depend on the selection of the interval of time, both with respect to its duration and to the time of the day. This selection obviously can be explained by the effect of random errors in determining the temperature and of the schematizations of the heat transfer theory in the soil. By using the average temperatures with respect to both soil depth and time, the influence of random fluctuations and errors in the determination of the temperature is somewhat diminished. The use of average temperatures makes it possible to characterize more accurately the mean value of the thermometric conductivity for a given layer. (Author)

Descriptors :   (*SOILS, THERMAL CONDUCTIVITY), TEMPERATURE, PENETRATION, ACCURACY, MATHEMATICAL ANALYSIS, MOISTURE, POROSITY, USSR

Subject Categories : Soil Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE