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Discrete-Continuum-Modelling with MODFLOW Conduit Flow Process (CFP)

  • Speaker: Dr.-Ing. Thomas Reimann (TU Dresden) and Prof. Steffen Birk (University of Graz)
  • Location: University of Neuchâtel, Av. du Premier Mars 26, Neuchâtel. Room: D59
  • Dates: 20-22 February, 2023
  • Cost
    • WES PhD School members: free.
    • Others:
      • Academic participants: 400 CHF
      • Industry participants: 800 CHF
      • you must email the PhD School Coordinator
  • Registration: https://forms.gle/cFkNyGtQY3DegrYt7

The MODFLOW Conduit Flow Process (CFP) is a discrete-continuum numerical groundwater flow model that couples 1D flow in discrete structures like karst conduits with the 3D MODFLOW continuum. Early developments of the model at the University Tübingen (Bauer 2001, Birk 2002, Liedl et al. 2003) were taken over by the United States Geological Survey USGS to form the Conduit Flow Process (CFP) for MODFLOW. Later, CFP was further enhanced and adapted by Reimann et al. The course is provided by Thomas Reimann from TU Dresden, Steffen Birk from the University Graz, and colleagues. Thomas Reimann is a groundwater engineer and works as a senior scientist at the Institute of Groundwater Management at TU Dresden. Steffen Birk is a Professor of Hydrogeology at the Institute of Earth Sciences at the University of Graz.

The course focuses on applying CFP to simulate groundwater flow and solute transport in karst systems. Accordingly, the course discusses general concepts to simulate process-based flow and transport in karstic environments. Then, the lecture aims to provide a sufficient understanding of the hydraulics behind CFP, which allows considering laminar and turbulent flow in discrete structures. With hands-on exercises, students will learn to apply CFP for karst systems and to analyze and optimize the use of the model. Besides flow, the course also aims to provide an overview of process-based computation of heat- and solute transport in karst. Finally, lectures will introduce a Python-script-based workflow for CFP, which allows comprehensive and scalable mode application and optional coupling to further tools for pre-and postprocessing, e.g., stochastic network generators.

Target group of the course: Professionals, graduate, and post-graduate students of hydrogeology, environmental- and groundwater engineering with basic knowledge of numerical groundwater flow- and solute transport simulation.

Suggested course schedule (3 hours morning, 2+ hours afternoon)

Day 1

  • Model concepts for process-based simulation of karst systems
  • Hydraulics for discrete-continuum modeling and numerical implementation
  • Introduction to the Conduit Flow Process (CFP) for MODFLOW
  • Basic application of CFP for flow (hands-on exercise with idealized models)
  • Presentation of example applications and outlook to Day2

Day 2

  • Wrap-up of Day 1 and discussion
  • Enhancements of CFP (conduit storage, partially filled pipes, boundary conditions)
  • Advanced application of CFP (Hands-on exercise with advanced models)
  • Introduction to process-based transport computation in CFP
  • Basic application of CFP for transport (hands-on training with idealized models)

Day 3

  • Wrap-up of Day 2 and discussion
  • Applied application of CFP for transport: Setup and optimization of numerical models
  • Applied application of CFP: Inversion process
  • Introduction of Script-based Pre- and postprocessing methods for CFP and application (hands-on exercise)
  • Final discussion of the course and outlook