Lecture 11 Characterizing Water

Lecture 11 Characterizing Water - Characterizing Soil Water...

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1 Characterizing Soil Water Characterizing Soil Water Gravitational Potential Gravitational Potential 1. Gravitational potential energy is due only to the height of an object (water) above some reference point . 2. Gravitational potential energy is independent of soil properties. Porous block Suction (capillarity) Capillary Potential Capillary Potential 100 cm Dry soil Ψ m = -100 cm (suction) Vertical distance between the surface of the water and the porous cup.
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2 Submergence Potential ( ψ s ) Equal to the distance below a free water surface Water Table 10 cm Total Potential Energy is the sum of the gravitational, submergence, and matric potential energies. Ψ g + ψ m + ψ s = ψ T Gravitational Potential + Matric Potential = Total Potential Reference level Ψ g = 0 Height (cm) 50 20 a 10 Ψ m = -65 cm Ψ g = 50 cm Ψ T = -15 cm
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3 Gravitational Potential + Matric Potential = Total Potential Reference level Ψ g = 0 Height (cm) 50 20 a b 10 Ψ m = -65 cm Ψ m = -5 cm Ψ g = 10 cm Ψ g = 50 cm
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 11 Characterizing Water - Characterizing Soil Water...

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