Lecture 6 Water Movement

Lecture 6 Water Movement - Soil Water Movement and...

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Unformatted text preview: Soil Water Movement and Retention Medium for plant growth Regulator of water supplies Recycler of raw materials Habitat for soil organisms Engineering medium Functions of Soil Functions of Soil Functions of Soil Medium for plant growth Physical Support Gas exchange Water Temperature Nutrient source Functions of Soil Regulator of water supplies Infiltration Run-off Storage/Movement Distribution Purification Integral to hydrologic cycle Water Movement Two Forces Responsible for Water Movement in Soils Gravity Capillarity Gravity Gravity Capillarity Spontaneous movement of water into and through pore spaces in soil without the aid of gravity. Adhesion and Cohesion Cohesion Adhesion and Cohesion oxygen H H S U R F A C E adhesion oxygen H H cohesion Adhesion and Cohesion adhesion Cohesion (H-bonding) Sur face droplet Adhesion and Cohesion Strong adhesion Weak adhesion Weak Adhesion Adhesion to Soil Particles Strong Adhesive Forces Soil Pores Adhesion and Cohesion Adhesion to the tube or pore wall Cohesion between water molecules capillarity Capillarity Tube/Pore wall } Force down h = 0.15 r adhesion cohesion Capillarity h = 0.15 r h Small pores Capillarity Soil Pores and Pore Size Distribution Texture Density Structure 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...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 6 Water Movement - Soil Water Movement and...

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