A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Richards Flow
The upper parts of the ground usually belong to the vadose zone, i.e. the zone between land surface and the top of the upper aquifer. This zone is a transition section between the atmosphere, biosphere, lithosphere and hydrosphere and connects the neighboring compartments via air, water and solids including biomass and organic matter. The vadose zone can be roughly subdivided from top to bottom into a soil water zone, intermediate zone, and the capillary fringe. Only 0.0012% of the global water reservoir or 0.05% of the fresh water budget remains in soil. Compared with groundwater reservoirs, which store over 30% of the global fresh water, the mass fraction of soil water within the hydraulic circle seems to be small, but is actually more dynamic. Water only resides in soil systems a few weeks on average, while groundwater systems can have residence times of several millenniums. Generally, the flow processes in soil take place under unsaturated conditions, i.e. the pore spaces are only partly filled with air and water. Moreover, such unsaturated conditions can occur in any multiphase regime where the water that partly fills the pore system is under suction and the pressure head is negative.
Richards Flow
The upper parts of the ground usually belong to the vadose zone, i.e. the zone between land surface and the top of the upper aquifer. This zone is a transition section between the atmosphere, biosphere, lithosphere and hydrosphere and connects the neighboring compartments via air, water and solids including biomass and organic matter. The vadose zone can be roughly subdivided from top to bottom into a soil water zone, intermediate zone, and the capillary fringe. Only 0.0012% of the global water reservoir or 0.05% of the fresh water budget remains in soil. Compared with groundwater reservoirs, which store over 30% of the global fresh water, the mass fraction of soil water within the hydraulic circle seems to be small, but is actually more dynamic. Water only resides in soil systems a few weeks on average, while groundwater systems can have residence times of several millenniums. Generally, the flow processes in soil take place under unsaturated conditions, i.e. the pore spaces are only partly filled with air and water. Moreover, such unsaturated conditions can occur in any multiphase regime where the water that partly fills the pore system is under suction and the pressure head is negative.
Richards Flow
Kalbacher, Thomas (author) / Du, Yanliang (author)
2012
18 Seiten
Article/Chapter (Book)
English
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Ann Richards Middle School, Texas
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