Sw6 - Soil Water Movement Gravity The Two Forces Responsible for Capillarity Adhesion and Cohesion Adhesion attraction of water molecules to a

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Soil Water Movement
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Gravity
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Adhesion and Cohesion The Two Forces Responsible for Capillarity Adhesion: attraction of water molecules to a surface Cohesion: attraction of water molecules to each other
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Tubes and Pores Adhesion and Cohesion Adhesion to the tube or pore wall Cohesion between water molecules capillarity
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Capillarity h Small pores
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Capillarity Bundles of Capillary Tubes
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Pore Size Distribution and Capillarity Texture Density Structure
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Texture and Soil Pores Sandy Silty Clayey
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Particle Size Large/coarse Medium Fine/Small Sand Loamy Sand Sandy Loam Silt Sandy clay Loam Silty clay Loam Silt Loam Loam Clay Loam Sandy Clay Silty Clay Clay Pore Size Large/Macro Meso/ Medium Micro/Small Capillarity Weak Moderate Strong Texture
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Gravity Dominated Capillarity Dominated
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Density Depth in Profile Arrangement of Particles Compaction Stronger Capillarity
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Structure Micropores (strong) Macropores (weak)
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Examples
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Sand Clay Water
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Sand Clay Initial Saturation
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Uncompacted Compacted Initial Saturation Sandy Loam
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Aggregates
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Wet Moist Same Texture and Density
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water Relevance transpiration
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impervious Water Water
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Extra Credit: 1.The two overall forces responsible for water movement in soils are ___ and ___
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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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Sw6 - Soil Water Movement Gravity The Two Forces Responsible for Capillarity Adhesion and Cohesion Adhesion attraction of water molecules to a

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