Difference between revisions of "Lateral MWT"
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| − | Once melt-water flows vertically through the pack ('''[[Vertical MWT]]''') it reaches the saturated area above the ground and below the snow pack. This melt-water moves laterally along the ground through a saturated Darcian flow. GSSHA currently uses methods developed by Colbeck (1974) to determine the flux volumes between each cell. The equation and figure from Colbeck (1974) | + | Once melt-water flows vertically through the pack ('''[[Vertical MWT]]''') it reaches the saturated area above the ground and below the snow pack. This melt-water moves laterally along the ground through a saturated Darcian flow. GSSHA currently uses methods developed by Colbeck (1974) to determine the flux volumes between each cell. The equation and figure - from Colbeck (1974) - show how the flux rate is calculated for lateral flow. |
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| + | {| | ||
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| + | | width=550 | ''c = θ * α * K<sub>w</sub> / Φ || (1) | ||
| + | |} | ||
| + | {| |- | : | width=550 | ||
| + | |''c = lateral flux rate (m<sup>2</sup>/hr) | ||
| + | |} | ||
| + | {| |- | : | width=550 | ||
| + | |''θ = lateral slope (deg) | ||
| + | |} | ||
| + | {| |- | : | width=550 | ||
| + | |''α = hydraulic properties of water, constant (ρ*g/μ ~54.7x10<sup>-6</sup> m<sup>-1</sup> s<sup>-1</sup>) | ||
| + | |} | ||
| + | {| |- | : | width=550 | ||
| + | |''K<sub>w</sub> = saturated hydraulic conductivity of snow (~0.00555 m s<sup>-1</sup>) | ||
| + | |} | ||
| + | {| |- | : | width=550 | ||
| + | |''Φ = effective porosity (unitless) | ||
| + | |} | ||
| + | |||
| + | [[File:Colbeck_1974_Picture.jpg]] | ||
Latest revision as of 21:50, 27 November 2012
Once melt-water flows vertically through the pack (Vertical MWT) it reaches the saturated area above the ground and below the snow pack. This melt-water moves laterally along the ground through a saturated Darcian flow. GSSHA currently uses methods developed by Colbeck (1974) to determine the flux volumes between each cell. The equation and figure - from Colbeck (1974) - show how the flux rate is calculated for lateral flow.
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c = θ * α * Kw / Φ | (1) |
| c = lateral flux rate (m2/hr) |
| θ = lateral slope (deg) |
| α = hydraulic properties of water, constant (ρ*g/μ ~54.7x10-6 m-1 s-1) |
| Kw = saturated hydraulic conductivity of snow (~0.00555 m s-1) |
| Φ = effective porosity (unitless) |
