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langevin-usgs edited this page May 14, 2024 · 4 revisions

2019 MODFLOW and More MODFLOW 6 Short Course

This course introduces participants to the next generation of MODFLOW, called MODFLOW 6. MODFLOW 6 is the sixth core version of MODFLOW released by the U.S. Geological Survey (previous core versions were released in 1984, 1988, 1996, 2000, and 2005). The program was rewritten using an object-oriented approach and offers new flexibility for simulating complex hydrologic problems. MODFLOW 6 combines many of the capabilities found in MODFLOW-2005, MODFLOW-NWT, MODFLOW-USG, and MODFLOW-LGR, and provides a platform for adding new packages and models. MODFLOW 6 was released by the USGS in 2017 and can be downloaded from the USGS website.

The purpose of this course is to present the new capabilities of MODFLOW 6. The course consists of lectures, discussions, example problems and hands-on exercises designed to demonstrate MODFLOW 6 and its new capabilities. Course participants will develop an understanding and working knowledge of:

  • The MODFLOW 6 concept, what’s new, and what’s no longer supported
  • New time series and observation capabilities
  • Advanced package capabilities (Multi-Aquifer Well, Streamflow Routing, Lake, and Unsaturated Zone Flow)
  • Newton-Raphson formulation for water-table aquifers
  • Local grid refinement, tight coupling of multiple groundwater models, and approaches for improving the flow solution
  • Advanced discretization approaches and packages, including a new discretization by vertices package
  • Full three-dimensional anisotropy capability using XT3D (and other XT3D functionality for flow correction on unstructured grids as an alternative to the GNC approach)
  • Utilities for converting previous models into the MODFLOW 6 format
  • MODFLOW 6 interface (input and output) structure and formats
  • Using MODFLOW 6 for complex hydrogeologic situations
  • Ongoing MODFLOW 6 development efforts
    • Comprehensive new skeletal storage, Compaction and SUBsidence (CSUB) Package
    • Groundwater Transport (GWT)
    • Multi-Porosity Transport
    • Variable-Density Groundwater Flow
    • Linear Network Flow (LNF) Model

Instructors

  • Langevin
  • Hughes
  • Provost
  • Panday

Topics

  • MODFLOW 6 overview
  • Input and output
  • Converter
  • Observations
  • Time series
  • Advanced packages
  • Newton
  • LGR
  • Advanced discretization
  • XT3D
  • What's in development
    • Subsidence
    • Transport
    • Variable-density flow and transport
    • Particle tracking

Exercises

Exercise 1. UzfLakSfrTest

  • Convert mf2005 to mf6
  • Split well package into multiple packages

Exercise 2. Observations and Time Series

  • Add observations to model
  • Add time series to model

Exercise 3. Advanced Packages (uzfp3_lakmvr_v2)

  • UZF recharge analysis
  • Effect of pumpage
  • Increased pumpage
  • ZONEBUDGET

Exercise 4. Newton Raphson (nwtp3 and keating)

  • Traditional formulation, high recharge
  • Newton formulation, high recharge
  • Newton formulation, low recharge
  • Recharge through dry layers (keating)

Exercise 5. LGR model

  • Simple LGR model
  • LGR with SFR

Exercise 6. Advanced discretization

  • DISV simple LGR
  • DISV with nested triangular grid
  • Biscayne aquifer (DISV quadtree grid)

Exercise 7. XT3D

  • DISV nested triangular mesh with XT3D
  • Anistropy
  • Groundwater whirls

Audience

This course is suited for existing MODFLOW users interested in learning about this new version of MODFLOW and how to use it for complex hydrogeologic conditions. Attendees will be required to bring a laptop computer (both Windows and Mac operating systems will be supported). There will be an optional MODFLOW developer discussion at the end of the class if requested by attendees.

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