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Soil Water Processes:Chapter 3. Learn how soil properties influence runoff, infiltration and plant growth. Learn some of the common terms that are used to describe soils profiles and soil properties. Learn about the main processes that occur when a soil wets and drys.

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soil water processes chapter 3
Soil Water Processes:Chapter 3
  • Learn how soil properties influence runoff, infiltration and plant growth.
  • Learn some of the common terms that are used to describe soils profiles and soil properties.
  • Learn about the main processes that occur when a soil wets and drys.
  • Learn how to quantify the amount of water that is stored in the soil and how this amount changes with time.
soil texture
Soil Texture

Figure 3.1

terms
Terms
  • Voids/Pores
  • Saturated
soil matrix
Soil Matrix

Figure 3.3

volumetric soil water content equation 3 4
Volumetric Soil Water ContentEquation 3.4

Volumetric Soil Water Content=Vw/Vt

gravimetric soil water content equation 3 6
Gravimetric Soil Water ContentEquation 3.6

Gravimetric Soil Water Content=mw/ms

terms bulk density
TermsBulk Density
  • Mass of soil per unit volume
  • Density of soil particles usually near 165 lb/ft3 or 2.65 g/cm3
  • Compare different soils
terms1
Terms
  • Tension-infiltration
    • Adhesion, Cohesion, Capillary, Suction Forces
  • Gravity-infiltration
  • Small pores vs. Large pores
  • Field capacity & Wilting point
water retention
Water Retention

Figure 3.4

hysteresis
Hysteresis

Figure 3.5

estimating infiltration rates
Estimating Infiltration Rates
  • Empirical Methods
    • Horton and Green-Ampt Equations
  • Physical Based Methods
    • Darcy’s Law
    • Flow related to hydraulic gradient and soil type
slide21

Seasonal Soil Water Balance

SM  P  IR  Q  G  ET

SM is the change in soil water storage in the soil profile

P is precipitation

IR is irrigation

G is percolation water

ET is evapotranspiration

Q is surface runoff