Abstract

One of the main functions of a cover liner is to prevent water from infiltrating into the waste thereby preventing the occurrence of ground water pollution. In the past, numerical models have predominately dealt with vertical infiltration or infiltration into sloping hillsides of infinite extent. The model investigated in this paper has a more realistic shape which is piece-wise linear with a horizontal top, vertical bottom and sloping section in-between. At the intersection of these segments are corner points where the physics instantaneous changes from sloping flow dynamics to either vertical or horizontal flow dynamics depending on the corner point. The abrupt change in physics at the corner points, can cause numerical problems especially when dealing with the boundary condition at the interface of two soils. This paper will deal with the corner point problem at the soil layer interface and, in particular, investigate the use of a Finite Element Grid around the corner points.

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