Difference between revisions of "Vertical MWT"
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{| |- | : | width=650 | {| |- | : | width=650 | ||
|''K<sub>w</sub> = hydraulic conductivity of snow at saturation, S | |''K<sub>w</sub> = hydraulic conductivity of snow at saturation, S | ||
| + | |''K = unsaturated hydraulic conductivity of snow | ||
| + | |} | ||
| + | {| |- | : | width=650 | ||
| + | |''S = snow saturation (0-1) | ||
| + | |''n = constant, typically 3 (Colbeck 1973) | ||
|} | |} | ||
Revision as of 21:04, 27 November 2012
As explained in Colbeck (1979) and Gray & Male (1981), the vertical flow of water through a snow pack is dominated by gravitational forces. Since capillary forces are typically ignored in vertical flow through a snow pack (Colbeck 1979; Gray and Male 1981; Colbeck and Anderson 1982), a gravity flow theory, such as used in the SNAP model (Albert & Krajeski, 1998) can be utilized. The hydraulic conductivity used within the SNAP model changes with saturation as seen in Equation 1. Vertical flow velocities ranging from 2 – 60 cm/min have been observed through a snow pack (Gray and Male 1981). For more information on the vertical flow equations used within the SNAP model the interested reader is encouraged to review Albert & Krajeski (1998).
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Kw = K * Sn | (1) |
| Kw = hydraulic conductivity of snow at saturation, S | K = unsaturated hydraulic conductivity of snow |
| S = snow saturation (0-1) | n = constant, typically 3 (Colbeck 1973) |
