Philips Equation Recall Richard’s Equation Solution S – Sorptivity

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Presentation transcript:

Philips Equation Recall Richard’s Equation Solution S – Sorptivity Assume K and D are functions of q, not z Solution Two terms represent effects of Suction head Gravity head S – Sorptivity Function of soil suction potential Found from experiment

Infiltration into a horizontal soil column Θ = Θo for x = 0, t > 0 Boundary conditions Θ = Θn for t = 0, x > 0 x Equation:

Measurement of Diffusivity by Evaporation from Soil Cores Air stream q q = soil water flux = evaporation rate

Measurement of Diffusivity by Evaporation from Soil Cores http://www.regional.org.au/au/asa/2006/poster/water/4521_deeryd.htm