Soil water and groundwater II Flashcards
How is infiltration measured?
as a rate or a total
what is infiltration capacity?
f(c) is the maximum rate at which soil can receive water through its surface
what is infiltration rate?
f(t) is the time-variable rate of water entering the soil through the surface
what is cumulative infiltration?
F(t) is the depth of infiltration from the beginning of rainfall to a particular time
what is a wetting front?
present when the change of soil moisture content with depth is so great that there is a shard discontinuity in the soil profile, between the wet soil above and the dry soil below
what is the time of ponding?
H(t) is the time at which the surface soil layer becomes saturated after the rainfall exceeds the hydraulic conductivity
What is the field measure instrument for determining infiltration?
infiltrometer: an artificial application of water to enclosed sample areas
what are the three models for determining infiltration?
- Horton
- Phillips
- Green-Ampt
what affect does organic matter have on infiltration rates?
increases infiltration rate
what is hydrophobicity when discussing factors affecting infiltration?
hydrophobic soil causing water to collect on the soil surface rather than infiltrate on the ground - driven by extreme dryness and/or fire
