An Assessment of the Nguyen and Finder Method for Slug Test Analysis |
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| Authors: | James J Butler Jr Zafar Hyder |
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| Institution: | James J. Butler Jr.;is an associate scientist with the Geohydrology Section of the Kansas Geological Survey (1930 Constant Ave., The University of Kansas, Lawrence, KS 66047) He holds a B.S. in geology from the College of William and Mary, and an M.S. and Ph.D. in applied hydrogeology from Stanford University. His primary research interest is the development of field methodology for site characterization. Zafar Hyder;is a doctoral candidate in the Department of Civil Engineering at the University of Kansas and a research assistant at the Kansas Geological Survey. He holds master's and bachelor's degrees in civil engineering from the University of Connecticut and Bangladesh University of Engineering and Technology, respectively. His research interests include aquifer characterization and analytical and numerical modeling of subsurface flow and transport. |
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| Abstract: | The Nguyen and Pinder method is one of four techniques commonly used for analysis of response data from slug tests. Limited field research has raised questions about the reliability of the parameter estimates obtained with this method. A theoretical evaluation of this technique reveals that errors were made in the derivation of the analytical solution upon which the technique is based. Simulation and field examples show that the errors result in parameter estimates that can differ from actual values by orders of magnitude. These findings indicate that the Nguyen and Pinder method should no longer be a tool in the repertoire of the field hydrogeologist. If data from a slug test performed in a partially penetrating well in a confined aquifer need to be analyzed, recent work has shown that the Hvorslev method is the best alternative among the commonly used techniques. |
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