Author(s): Takeshi Kawatani; Masahiko Saito; Jiro Tsuchiyama
Linked Author(s):
Keywords: No Keywords
Abstract: It is important to estimate the permeability of a confining layer which could be semipervious. For example, when the confining layer is semipermeable, the deep well operation for a large-scale excavation influences the flow not only in the pumped aquifer but also in neighboring aquifers. Furthermore, the distribution of piezometric head within the excavation site differs from that expected when the confining layer is impervious. In general, the field measurement method such as a pumping test is not applicable directly to a semipervious formation. Thus, this study aims at determining the permeability of the confining layer from the depression of water table in a leaky phreatic aquifer. The inverse analysis is performed by using the finite element method and the constrained simplex method.
Year: 1997