GMS:Conductance: Difference between revisions
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where ''Q'' is the flow rate, ''k'' is the hydraulic conductivity, i represents the hydraulic gradient, and A represents the gross cross-sectional area of flow. Darcy's law can also be expressed as: | where ''Q'' is the flow rate, ''k'' is the hydraulic conductivity, ''i'' represents the hydraulic gradient, and ''A'' represents the gross cross-sectional area of flow. Darcy's law can also be expressed as: | ||
<!--[[Image:eq_cond2.gif]]--> | <!--[[Image:eq_cond2.gif]]--> | ||
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Where t is the thickness of the material and w is the width of the material along the length of the arc. When GMS applies the boundary condition from the arc to the grid cell, it automatically multiplies the entered value of conductance by the length of the arc that intersects the cell to create an accurate conductance value for the cell. | Where ''t'' is the thickness of the material and ''w'' is the width of the material along the length of the arc. When GMS applies the boundary condition from the arc to the grid cell, it automatically multiplies the entered value of conductance by the length of the arc that intersects the cell to create an accurate conductance value for the cell. | ||
=== Polygons === | === Polygons === | ||
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Where t is the thickness of the material. When GMS converts the stress from a polygon to a grid cell, it automatically multiplies the entered value of conductance by the area of the cell that is covered by the polygon to create an appropriate conductance value for the cell. This restores the dimensional accuracy to the expression for conductance. | Where ''t'' is the thickness of the material. When GMS converts the stress from a polygon to a grid cell, it automatically multiplies the entered value of conductance by the area of the cell that is covered by the polygon to create an appropriate conductance value for the cell. This restores the dimensional accuracy to the expression for conductance. | ||
===Points=== | ===Points=== | ||
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===Parameter Factors=== | ===Parameter Factors=== | ||
Beginning with GMS version 7.0, the Well, Drain, River, General head, and Stream boundary conditions have a parameter factor field that is associated with each boundary condition. The parameter factor is used with the parameter value to compute the final value of conductance for a given boundary condition (or in the case of the well package the final Q value). The parameter factor is automatically set by GMS when doing the ''Map->MODFLOW'' command. This value will be set to the length of the arc in the cell or the area of the polygon in the cell associated with the boundary condition; for a point feature the factor is set to 1.0. | Beginning with GMS version 7.0, the Well, Drain, River, General head, and Stream boundary conditions have a parameter factor field that is associated with each boundary condition. The parameter factor is used with the parameter value to compute the final value of conductance for a given boundary condition (or in the case of the well package the final Q value). The parameter factor is automatically set by GMS when doing the '''''Map->MODFLOW''''' command. This value will be set to the length of the arc in the cell or the area of the polygon in the cell associated with the boundary condition; for a point feature the factor is set to 1.0. | ||
{{Navbox GMS}} | {{Navbox GMS}} | ||
[[Category:MODFLOW]] | [[Category:MODFLOW]] | ||
