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Lecture 7 Characterizing Water

Lecture 7 Characterizing Water - Homework I will be...

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Homework I will be e-mailed It is also posted on the website
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Characterizing Soil Water Characterizing Soil Water
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Three Potential Energies: Gravitational Potential Capillary or Matric Potential Submergence Potential
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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. We will use gravitational potential energy per unit weight of water (cm).
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Porous block Suction (capillarity) Matric or Capillary Potential Matric or Capillary Potential 100 cm Dry soil Ψm = -100 cm (suction) Vertical distance between the surface of the water and the porous cup.
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Submergence Potential s ) Equal to the distance below a free water surface Water Table 10 cm Sand Clay
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Total Potential Energy is the sum of the gravitational, submergence, and matric potential energies. Ψ g + ψ m + ψ s = ψ T
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Gravitational Potential  +  Matric Potential  =  Total Potential Reference level Ψ g = 0 Height (cm) 50 20 a 10 m = -95 cm Ψ g = 50 cm Ψ Ψ T  = -45 cm
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Gravitational Potential  +  Matric Potential  =  Total Potential Reference level Ψ g = 0 Height (cm) 50 20 a b 10 m = -95 cm Ψ m = -25 cm Ψ g = 10 cm Ψ g = 50 cm Ψ Ψ T  = -45 cm Ψ T  = -15 cm Ψ Ta  –  Ψ Tb = (- 45cm) - (-15cm) = -30 cm
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Quantifying Water Movement Quantifying Water Movement
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Gradient The difference in potential divided by the Distance between the two points considered
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