Lecture 9 Water Movement(1)

Lecture 9 Water Movement(1) - Adhesion to Soil Particles...

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1 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
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2 Functions of Soil Regulator of water supplies Infiltration Run-off Storage/Movement Distribution Purification Integral to hydrologic cycle Total Earth Water Total Earth Water Oceans Oceans Ice and Glaciers Aquifer/Groundwater Aquifer/Groundwater Atmosphere Atmosphere Lakes Soil Soil Rivers Rivers 97% 2.0% 0.6% 0.2% 0.012% 0.001% 0.0002% Water Movement
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3 Two Forces Responsible for Water Movement in Soils Gravity Capillarity Gravity Gravity
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4 Capillarity Spontaneous movement of water into and through pore spaces in soil without the aid of gravity. Adhesion and Cohesion Cohesion
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5 Adhesion and Cohesion Adhesion and Cohesion oxygen H H S U R F A C E adhesion oxygen H H cohesion Adhesion and Cohesion Adhesion and Cohesion adhesion Cohesion (H-bonding) Surface Adhesion and Cohesion Strong adhesion Weak adhesion
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6 Weak Adhesion
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Unformatted text preview: Adhesion to Soil Particles Strong Adhesive Forces Soil Pores Soil Pores Adhesion and Cohesion Adhesion to the tube or pore wall Cohesion between water molecules Tube wall 7 Capillarity Capillarity Tube/Pore wall } Force down h = 0.15 r Capillarity Capillarity h = 0.15 r h 8 Soil Pores and Pore Size Distribution Texture Density Structure Define. 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 Soil Pores Sandy Silty Clayey 9 Density Compaction Organic Matter Arrangement of Particles Depth in Profile Structure 10 Sand Clay Water Sand Clay Initial Saturation Uncompacted Compacted Initial Saturation Sandy Loam 11 Aggregates Wet Moist Same Texture and Density water Relevance transpiration 12 impervious Water Water...
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Lecture 9 Water Movement(1) - Adhesion to Soil Particles...

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