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# Strip aquifer

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# Strip aquifer

The dialog window "Groundwater mound: strip aquifer" calculates a steady state groundwater mounding caused by recharge, that is homogeneously distributed over the whole area of an unconfined aquifer bounded by two Constant head boundaries, two Constant Flow boundaries or one Constant head boundary and one Constant Flow boundary. Constant head boundaries act as drains (i.e. discharge boundaries) during mounding.

The tool also includes solution for local infiltration that is assigned along a strip area of specified width and infinite length and parallel to the aquifer's boundaries

The dialog window is opened by selecting "File > Hydrogeologist workbench > Groundwater mound > Strip aquifer".

Samples of "Groundwater mound: strip-aquifer" dialog box. Left boundary – Constant Head; Right boundary – 1) Constant Head, 2) Constant Flow, 3) No-Flow. Last sample  –  local infiltration in a strip aquifer with Constant head boundaries.

Explanatory table

The following analytical solutions are applied:

1. Constant Head boundary (I – I)

mounding height:

distance from the left boundary to the location with maximum mounding:

To calculate maximum hydraulic head (mounding) the calculated distance from the above formula should be entered in the formula for hydraulic head (mounding).

discharge to drain 1 (left boundary) and drain 2 (right boundary) depending on direction of initial gradient:

2. Constant Head boundary and No-Flow boundary (I – II)

mounding height:

maximum Hydraulic Head appears always at No-Flow boundary:

discharge to drain 1 (left boundary):

3. Constant Head at the left boundary and Constant Flow at the right boundary (I – Q)

mounding height:

maximum Hydraulic Head appears always at No-Flow boundary:

discharge to drain 1 (left boundary):

4. Constant Head boundaries with local infiltration:

mounding height:

distance from the left boundary to the location with maximum mounding:

the above formula is for point locations that are inside local infiltration area. Otherwise maximum Hydraulic Head and mounding height will be at the boundary with the highest value of Constant Head.

discharge to drain 1 (left boundary) and drain 2 (right boundary):

References

Основы гидрогеологических расчетов. Ф.М. Бочевер, И.В.Гармонов, А.В.Лебедев, В.М.Шестаков. М., Изд-во «Недра», 1969.

Strack O.D.L. Analytical groundwater mechanics. Cambridge University Press, 2017.