Abstract
The coupled saturated‐unsaturated flow that results from a horizontal pressurized water‐filled cylindrical cavity is studied, under the assumption of quasilinearization for the unsaturated flow, using a combined boundary element—finite element method. Earlier work on this problem considered infiltration under hydrostatic pressure alone. That work is extended here by the inclusion of an additional pressure head in the cavity. Detailed results are calculated for a range of pressure heads and dimensionless cavity radii, and the size of the saturated region as a function of these two parameters is illustrated. These show that even for small cavities and comparatively high pressure heads, gravity effects cannot be ignored. The calculations also reveal a linear relationship between the flux from the cavity and the applied pressure head, with the slope of this line varying approximately as the two‐thirds power of the dimensionless cavity radius.
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