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Lecture 6: Soil and the Hydrologic Cycle
Terms in this set (20)
Area of land drained by a single system of streams and bounded by ridges that separate it from adjacent watersheds
Upper surface of saturation
Water with saturated zone
zone in soil above the water table that remains saturated or almost saturated with water
Aerated region of soil above the permanent watertable
What is the Global hydrologic cycle?
The cycle of how water goes from the earths surface to the atmosphere to back the earths surface
What drives the Global Hydrologic cycle?
How is the global stocks of water divided?
Ocean = 97.25%
Ice = 2%
Ground water = 0.7%
All other water = <0.05%
How much of the other water percent, is made up of soil moisture?
What is the SPAC
Soil Plant Atmosphere Continuum
What is the soil-plant-atmosphere continuum?
The pathway for water moving from soil through plants to the atmosphere
How does the moisture flow work in SPAC?
Moisture will travel from areas of higher potential to areas of lower potential
What is the water balance equation?
What do the variables mean in the water balance equation?
P = precipitation
ET = Evapotranspiration
SS = Soil Storage
D = Discharge
How is the disposition of a watershed expressed as a water balance equation?
The water balance equation includes all the inputs and outputs of a watershed
What does the deposition of water in a watershed depend on?
Timing of precipitation
Type of vegetation
and Soil Properties
What is the idea of evapotranspiration?
the sum of water evaporation and transpiration from a surface area to the atmosphere
In a humid region, how much water is loss in Sandy Loam and Silt loam
Sandy loam is roughly 55% and Silt loam is 50% (Values based on water loss from percolation)
In Sub humid to arid regions, what are the water loss values for the silt loam soil textures?
Silt loam is 33% in a sub humid zone, but is less than 10% in an arid region. But is a little less than 40% in an arid region that is irrigated. (Values based on water loss from percolation)
What is capillary fringe?
the subsurface layer in which groundwater seeps up from a water table by capillary action to fill pores
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