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Lecture 8 Conductivity and Darcy

Lecture 8 Conductivity and Darcy - Characterization of Soil...

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Characterization of Soil Moisture Status and the Movement of Water in Soils
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Example: You collect a 200 cm 3 soil sample. Its moist weight is 150 g. After drying, the dry weight is 100 g. Gravimetric water content: Moist weight – Dry weight Dry weight = Water weight Dry weight 150 g - 100g 100g = 50 g = 0.5 or 50% 100g
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Example: You collect a 200 cm 3 soil sample. Its moist weight is 150 g. After drying the dry weight is 100 g. Volumetric water content: 150 g - 100g 200 cm 3 = = 50 cm 3 water = 0.25 or 25% 200 cm 3 soil Volume Water Volume Soil Density of water 1 g/cm 3 50 g 200 cm 3
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Energy-Based Characterizing Soil Moisture Status Relating water content and matric potential (suction)
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Characterizing Soil Water Suction applied in discrete increments. Water Remaining In soil Suction applied (cm) 0 10,000 One soil saturated * Soil Core Moisture Release Curve
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Texture, Density Water Remaining In soil Suction applied (cm) 0 10,000 saturated * A B Two Soils coarser finer
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Pore Size Distribution Water Remaining In soil Suction applied (cm) 10,000 saturated *
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Soil Water Content
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