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Stack #189251
Hydrology - intro hydrology 2nd yr university
| Question | Answer |
|---|---|
| Air Entry Tension | varies with soil type and water content of the soil -the greater the water content the greater the air entry tension -when all of the pores are filled with water the matric potential = 0 |
| Capillarity | determines the amount of soil tension (negative pressure) -the matric suction or matric potential |
| What are the 2 forces that act on water in unsaturated soil? | Gravity and capillary forces |
| Dielectric Constant | the ratio of capacitance of dielectric to the capacitance of air |
| Time Domain Reflectometry | an electromagnetic wave passes through the soil from one metal rod to another. The amount of time that it takes the wave to reach the second rod depends on the soil moisture content. -based on the dielectric constants of materials |
| Field capacity | the volumetric water content value when the drainage of gravitation water becomes negligible |
| Saturation | the volumetric water content value when all of the soil pores are filled |
| Root zone | the area of the soil profile where the roots are present -typically unsaturated -gauge pressure is negative (<0) -extends from the surface of the soil to the depth of the deepest roots |
| Plant available Water | The water in the soil that is available for plant use |
| Water Table | Boundary between the Tension Saturated Zone and the groundwater zone. -gauge pressure is equal to 0 |
| Phreatic Zone | aka groundwater zone -the saturated portion of the soil -where gauge pressure is positive (>0) |
Created by:
bionic79
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