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Errors in Heat Flux Measurement by Flux Plates of Contrasting Design and Thermal Conductivity

^a USDA-ARS, National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011-4420
^b USDA-ARS, Soil and Water Management Research Unit, St. Paul, MN 55108
^c Dep. of Physics and Astronomy, Drake University, Des Moines, IA 50311
^d Dep. of Agronomy, Iowa State University, Ames, IA 50011

View larger version (21K): [in a new window]   Fig. 1. Predicted ratio of heat flux density through each plate to that through the soil (Gm/G) at varying soil determined from Eq. [1].

View larger version (26K): [in a new window]   Fig. 2. Average heat flux density through each type of flux plate compared with the known flux density through the sand. Error bars represent 1 SD.

View larger version (25K): [in a new window]   Fig. 3. Average corrected (using Eq. [1]) heat flux density through each type of flux plate compared to the known flux density through the sand.

View larger version (33K): [in a new window]   Fig. 4. (A) Uncorrected and (B) corrected Gm on Day 207 for pairs of four types of heat flux plate at 6 cm in Canisteo soil compared with G determined by Eq. [9].

View larger version (17K): [in a new window]   Fig. 5. H vs. as defined in Eq. [2], with H determined from the full representation and from the single term of the power series approximation described in Philip (1961).