Processing Modflow
A Simulation System for Modeling Groundwater Flow and Pollution
Wen-Hsing Chiang and Wolfgang Kinzelbach
December 1998
Preface
Welcome to Processing Modflow: A Simulation System for Modeling Groundwater Flow andPollution. Processing Modflow was originally developed for a remediation project of a disposalsite in the coastal region of Northern Germany. At the beginning of the work, the code wasdesigned as a pre- and postprocessor for the groundwater flow model MODFLOW. Several yearsago, we began to prepare a Windows-version of Processing Modflow with the goal of bringingvarious codes together in a complete simulation system. The size of the program code grew, aswe began to prepare the Windows-based advective transport model PMPATH and add optionsand features for supporting the solute transport models MT3D, MT3DMS and MOC3D and theinverse models PEST and UCODE.
As in the earlier versions of Processing Modflow, our goal is to provide an integratedgroundwater modeling system with the hope that the very user-friendly implementation will lowerthe threshold which inhibits the widespread use of computer based groundwater models. Tofacilitate the use of Processing Modflow, more than 60 documented ready-to-run models areincluded in this software. Some of these models deal with theoretical background, some of themare of practical values.
The present text can be divided into three parts. The first two chapters introduce PMWINwith an example. Chapters 3 through 5 are a detalied description of the building blocks. Chapter3 describes the use of Processing Modflow; chapter 4 describes the advection model PMPATHand chapter 5 introduces the modeling tools provided by Processing Modflow. The third part,Chapter 6, provides two tutorials and documents the examples.Beside this text, we have gathered about 3,000 pages of documents related to the supportedmodels. It is virtually not possible to provide all the documents in a printed form. So we decidedto present these documents in an electronic format. The advantage of the electronic documentsis considerable: with a single CD-ROM, you always have all necessary documents with you andwe save resources by saving valuable papers and trees.
Many many people contributed to this modeling system. The authors wish to express heartfeltthanks to researchers and scientists, who have developed and coded the simulation programsMODFLOW, MOC3D, MT3D, MT3DMS, PEST and UCODE. Without their contributions,Processing Modflow would never have its present form. Many thanks are also due to authors ofnumerous add-on packages to MODFLOW.
We wish to thank many of our friends and colleagues for their contribution in developing,checking and validating the various parts of this software. We are very grateful to Steve Bengtson, John Doherty, Maciek Lubczynski, Wolfgang Schäfer, Udo Quek, Axel Voss andJinhui Zhang who tested the software and provided many valuable comments and criticisms. Fortheir encouragement and support, we thank Ian Callow, Lothar Moosmann, Renate Taugs, Gerritvan Tonder and Ray Volker. The authors also wish to thank Alpha Robinson, a scientist at theUniversity of Paderborn, who checked Chapter 3 of this user’s guide. And thanks to our reader and software users - it is not possible for us to list by name here all the readers and users whohave made useful suggestions; we are very grateful for these.
Wen-Hsing Chiang
Wolfgang Kinzelbach
Hamburg Zürich
December 1998
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