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Philips Equation

Philips Equation. Recall Richard’s Equation 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.

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Philips Equation

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  1. Philips Equation • Recall Richard’s Equation • 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

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

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

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

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