|Wendroth, O - ZALF, GERMANY|
|Nielsen, D - UNIV. OF CALIFORNIA DAVIS|
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 6, 2003
Publication Date: November 6, 2003
Citation: JAYNES, D.B., WENDROTH, O., NIELSEN, D.R. STATE-SPACE ANALYSIS OF THERMAL DIFFUSIVITY DURING WATER PERCOLATION IN A FIELD SOIL. ASA-CSSA-SSSA ANNUAL MEETING ABSTRACTS. 2003. CD-ROM. MADISON, WI. Technical Abstract: Estimating soil thermal diffusivity under steady state field water infiltration is complicated, as both diffusive and convective heat transport occur. The objective of the underlying study was to set up a state space model for estimating thermal diffusivity based on measurements of soil temperature at two soil depths and water infiltration rate. Besides thermal diffusivity, empirical coefficients related to pore water velocity, model and measurement variance were estimated. The latter two were obtained from the stochastic filter which is combined with the physical equation of heat transport. Effects of different measurement resolution and noise of the observed soil temperature series on the estimation result are studied and illustrated.