Lecture 10 Soil Water Energy

Lecture 10 Soil Water Energy - 1 Soil Water Energy The...

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Unformatted text preview: 1 Soil Water Energy The movement of soil water is due to two forces: Gravity Capillarity Gravity moves water downward Capillarity moves water in all directions. Potential Energy Potential Energy Energy waiting to be used or exploited 2 High potential Energy Low potential Energy Water moves in response to differences in potential energy, from high potential energy to low potential energy. Gravitational Potential Energy Gravitational Potential Gravitational Potential 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 g = mg g = h (cm) mg Gravitational Potential Gravitational Potential Reference level g = 0 Height (cm) 100 50 a b P ga = 100 cm P gb = 40 cm 40 soil Difference in energy determines movement Independent of soil properties 3 Gravitational Potential Gravitational Potential Reference level ( g = 0) Height (cm) 100 a b ga = 60 cm gb = 0 cm ga gb 60 - 0 =...
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Lecture 10 Soil Water Energy - 1 Soil Water Energy The...

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