In-situ determination of soil thermal characteristics Academic Article uri icon


  • Four variations of the least-squares regression procedure proposed by Lettau (1971) were used to define a solution envelope containing the soil thermal diffusivity function, (z), for a soil with a heterogeneous moisture profile. An explicit finite difference model of the one-dimensional heat equation was used to evaluate the four variations of Lettau's procedure based upon agreement between measured and simulated temperatures over a 24-h temperature cycle. The application of Lettau's regression procedure to a database containing only temperature data from the cooling cycle portion of the diurnal temperature wave was shown to most faithfully reproduce field temperature measurements.

published proceedings

  • Transactions of the American Society of Agricultural Engineers

author list (cited authors)

  • Auvermann, B. W., McFarland, M. J., & Hill, D. W.

complete list of authors

  • Auvermann, BW||McFarland, MJ||Hill, DW

publication date

  • May 1992