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Slug Test Analysis to Evaluate Permeability of Compressible Materials
Author(s) -
Choi Hangseok,
Nguyen TheBao,
Lee Chulho
Publication year - 2008
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.2008.00453.x
Subject(s) - compressibility , curvature , geology , geotechnical engineering , permeability (electromagnetism) , slug test , hydraulic conductivity , test data , line (geometry) , petroleum engineering , soil science , mathematics , mechanics , geometry , engineering , soil water , chemistry , physics , software engineering , membrane , biochemistry
The line‐fitting methods such as the Hvorslev method and the Bouwer and Rice method provide a rapid and simple means to analyze slug test data for estimating in situ hydraulic conductivity ( k ) of geologic materials. However, when analyzing a slug test in a relatively compressible geologic formation, these conventional methods may have difficulties fitting a straight line to the semilogarithmic plot of the test data. Data from relatively compressible geologic formations frequently show a concave‐upward curvature because of the effect of the compressibility or specific storage ( S s ). To take into account the compressibility of geologic formations, a modified line‐fitting method is introduced, which expands on Chirlin’s (1989) approach to the case of a partially penetrating well with the basic‐time‐lag fitting method. A case study for a compressible till is made to verify the proposed method by comparing the results from the proposed methods with those obtained using a type‐curve method (Kansas Geological Survey method [Hyder et al. 1994]).