sw5 - Energy and Water Flow Determination Gravitational and...

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Energy and Water Flow Determination
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Gravitational and Matric Potential Energies
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Gravitational Potential Ψ g = mgh The greater the height, the greater the potential energy. The potential energy of a unit quantity of water. Unit quantities: volume mass weight ψ g = mg Ψ g = h (cm) mg
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Gravitational Potential Reference level Ψ g = 0 Height (cm) 100 50 a b ψ ga = 100 cm ψ gb = 40 cm 40 soil Difference in energy determines movement Independent of soil properties Ψ ga – Ψ gb 100 - 40 = 60 cm
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Gravitational Potential Reference level g = 0) Height (cm) 100 a b Ψ ga = 60 cm Ψ gb = 0 cm Ψ ga – Ψ gb 60 - 0 = 60 cm 40 0
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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.
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Capillary Potential Energy (Matric Potential Energy)
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Matric Potential “suction” potential - capillarity Applies to unsaturated soils Relates to the ability of soils to move water into their pores
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Primary Factors in Matric Potential Texture, Density, Structure Pore Size Distribution Moisture Content Which Pores are Filled
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This note was uploaded on 02/04/2011 for the course SWS 3022 taught by Professor Bonczek during the Spring '11 term at University of Florida.

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sw5 - Energy and Water Flow Determination Gravitational and...

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