Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title QTRACER: Tracer-Breakthrough Curve Analysis for Karst and Fractured-Rock Acquifer (on CD-ROM).
CORP Author Environmental Protection Agency, Washington, DC. Office of Solid Waste.
Publisher Feb 1999
Year Published 1999
Stock Number PB99-501660
Additional Subjects Models-simulation ; Software ; Aquifer systems ; Karst hydrology ; Tracer techniques ; Subsurface flow ; Groundwater movement ; Hydraulics ; Fracture permeability ; Geologic fractures ; Tracer studies ; Discharge(Water) ; Concentration(Composition) ; CD-ROM ; QTRACER computer model
Library Call Number Additional Info Location Last
NTIS  PB99-501660 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 05/04/2000
Collation 1 CD-ROM
Tracer tests are generally regarded as being the most reliable and efficient means of gathering subsurface hydraulic information. This is true for all typed of aguifers, but especially so for karst and fractured-rock aquifers. Qualitative tracing tests have been conventionally employed in most karst sites in the United States. Quantitative tracing tests are employed sparingly at karst sites in the Unites States, although it is widely recognized that they provide a wealth of hydraulic and geometric data on subsurface conditions. Quantitative tracer tests are regarded as more difficult and time-consuming than qualitative tracing tests, which is a fallacy to be overcome. The benefits of quantitative tracing far outweigh any additional expenses that are incurred. An efficient, reliable and easy-to-use computer program, QTRACER, designed to run on PCs running any version MS-DOS or Windows, has been developed to facilitate tracer-breakthrough curve analysis. It solves the necessary equations from user-generated data input files using robust integration routines and by relying on established hydraulic models. Additional features include dynamical memory allocation, ability to extrapolate late-time data using any one of three difficult methods, two separate methods for handling oversized time-concentration data files, and a powerful interactive graphics routine. Two other programs are included to facilitate the use of QTRACER. The first, NDATA, allows the user to interpolate either their time-concentration or time-discharge data files to fill in data gaps. The second programs, AUTOTIME, allows the user to convert time-concentration data files recorded using military time into sequential decimal time as required by QTRACER. Files created by these two programs may be appended to the bottom of a sampling station data file that can be read by QTRACER.