Documentation and User's Guide: GS2 and GS3 - variably saturated flow and mass transport models. Final report (including 3 example problems)

This report presents documentation and a user's manual for programs GS2 (two-dimensional version) and GS3 (three-dimensional version). Mathematical equations and physical principles utilized to develop the code are presented in Section 2. The numerical approach used (Galerkin Finite Elements) is presented in Section 3. Section 4 presents an overview of how problems should be set up to properly use the code while detailed input instructions are presented in Section 5. Output produced by the code is discussed in Section 6. Three example problems, including sample input data sets and output data, are presented in Section 7. Program information is provided in Section 8. A listing of important program variables along with complete program listings are presented in the Appendices. This report was prepared as part of a project in which NRC staff was presented a training course on how to properly use this computer program. Programs GS2 and GS3 can be utilized to analyze flow and mass transport in unsaturated, partially saturated, or fully saturated flow regions. It is anticipated that the NRC will use the model for checking information provided by a licensee, for evaluating alternative sites and designs for waste disposal, and for comparing their results with results more » from other methods of solution. Three example problems are presented in microfiche in the back pocket. 16 refs. « less