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Determining Soil Water Flux and Pore Water Velocity by a Heat Pulse Technique

^a Soil and Fertilizer Institute, Hebei Academy of Agricultural Sciences, Shijiazhuang, Hebei 050051, China
^b Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506 USA
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 USA

View larger version (23K): [in a new window]   Fig. 1 Transient dimensionless temperature difference between the downstream and upstream sensors (Eq. [18]) for a range of thermal diffusivities with , and t0 = 15 s

View larger version (15K): [in a new window]   Fig. 2 Transient dimensionless temperature difference between the downstream and upstream sensors (Eq. [18]) for a range of heat pulse velocities with = 6.0 x 10-7 m2 s-1, xd = xu = 0.006 m, and t0 = 15 s

View larger version (19K): [in a new window]   Fig. 3 Maximum dimensionless temperature difference (MDTD, Eq. [21]) as a function of heat pulse velocity for a range of thermal diffusivities with xd = xu = 0.006 m, and t0 = 15 s

View larger version (44K): [in a new window]   Fig. 4 Schematic view of the experimental setup (not drawn to scale)

View larger version (69K): [in a new window]   Fig. 5 Transient dimensionless temperature at the downstream and upstream positions of the thermo-TDR probe as a function of soil water flux for the (a) sand, (b) sandy loam, and (c) clay loam

View larger version (33K): [in a new window]   Fig. 6 Transient dimensionless temperatures at the downstream (xd = 5.75 mm) and upstream (xu = 6.01 mm) positions as influenced by soil water flux for the sand. Symbols and lines indicate measured and predicted values, respectively

View larger version (34K): [in a new window]   Fig. 7 Transient dimensionless temperatures at the downstream (xd = 5.75 mm) and upstream (xu = 6.01 mm) positions as influenced by soil water flux for the sandy loam. Symbols and lines indicate measured and predicted values, respectively

View larger version (31K): [in a new window]   Fig. 8 Transient dimensionless temperatures at the downstream (xd = 6.01 mm) and upstream (xu = 5.75 mm) positions as influenced by soil water flux for the clay loam. Symbols and lines indicate measured and predicted values, respectively

View larger version (12K): [in a new window]   Fig. 9 Maximum dimensionless temperature difference (MDTD) as a function of soil water flux for the sand, sandy loam, and clay loam. Symbols and lines represent measured and predicted (Eq. [21]) values, respectively