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DSD-INT 2019 Ongoing MODFLOW Development by the USGS and External Collaborators - Hughes

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Presentation by Joe Hughes, USGS, at the iMOD - User Day, during Delft Software Days - Edition 2019. Tuesday, 12 November 2019, Delft.

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DSD-INT 2019 Ongoing MODFLOW Development by the USGS and External Collaborators - Hughes

  1. 1. U.S. Department of the Interior U.S. Geological Survey Ongoing MODFLOW Development by the USGS and External Collaborators Christian D. Langevin, Joseph D. Hughes, Alden M. Provost, Sorab Panday, Richard G. Niswonger, Scott Paulinski, Jarno Verkaik, Martijn Russcher, Eric Morway, Vivek Bedekar, Joshua Larsen, Alastair Black, and William Witterick iMOD - International User Day November 12, 2019
  2. 2. Core Principles Teachable Documented Reliable Robust Efficient Extensible Portable MODFLOW Philosophy
  3. 3. MODFLOW Support Environment Core Principles Teachable Documented Reliable Robust Efficient Extensible Portable
  4. 4. Reactive Transport Solute and Heat Transport Landscape Hydrology Parallel Subsidence Unstructured Grids Parameter Estimation and Uncertainty Unsaturated Zone Karst and Pipe Flow Flow Path Analysis Management Surface Water Flow Core Principles Teachable Documented Reliable Robust Efficient Extensible Portable
  5. 5. MODPATH mod-PATH3DU PATH3D FlowSource MODFLOW-USG CFP, VKD PESTPP-OPT MODSIM GWM UZF HYDRUS VSFSFR, SWR HEC-RAS BRANCH PEST PESTPP UCODE MODFLOW-USG MODFLOW 6 SUB CSUB SAMG PKS-MODFLOW PKS-SEAWAT MODFLOW 6 GSFLOW-PRMS SWB, HSPF, SWAT OWHM MT3DMS MT3D-USGS SEAWAT, SWI GWT PHREEQC-PHT3D PHWAT RT3D MODFLOW ECOSYSTEM OF CODES Reactive Transport Solute and Heat Transport Landscape Hydrology Parallel Subsidence Unstructured Grids Parameter Estimation and Uncertainty Unsaturated Zone Karst and Pipe Flow Flow Path Analysis Management Surface Water Flow Core Principles Teachable Documented Reliable Robust Efficient Extensible Portable
  6. 6. USGS MODFLOW Directions ▪ Development of large-scale, National and regional hydrologic models ▪ National Hydrologic/Groundwater Model ▪ Integrated Water Availability Assessments
  7. 7. USGS MODFLOW Directions (cont.)NumberofProjects Hydrologic Software Source: 2018 internal USGS modeling survey
  8. 8. MODFLOW 6
  9. 9. Typical MODFLOW Applications ▪ Water availability ▪ Coupled surface and groundwater systems ▪ Conjunctive Use and Management ▪ Contaminant transport ▪ Saltwater intrusion ▪ Mine and Tunnel Dewatering ▪ Land subsidence and aquifer compaction ▪ Well hydraulics ▪ Aquifer storage and recovery ▪ Deep well injection ▪ Aquifer thermal energy storage ▪ Oil reservoir simulation ▪ Electrical flow
  10. 10. Regular or Unstructured Grids ▪ Discretization Approaches ▪ Regular MODFLOW grid ▪ Unstructured grids
  11. 11. Flexible Mesh Example
  12. 12. MODFLOW 6 Multi-Model Coupling ▪ Any number of models can be included in a simulation ▪ Models coupled at matrix level ▪ Flexibility supports coupling of parent, child, grandchild models, stacked models or adjacent models
  13. 13. IDOMAIN Capability ▪Improve efficiency for models with large areas of inactive cells ▪Address MODFLOW limitations with discontinuous hydrogeologic layers
  14. 14. XT3D Approach ▪ General and robust handling of 3D anisotropy ▪ Hydraulic conductivity ellipsoid can be specified by cell ▪ Has other benefits, but can be computationally demanding
  15. 15. Water Mover ▪ Generalized package for transferring water from one MODFLOW package to another ▪ Water can be transferred from a “provider” to a “receiver” subject to simplified rules ▪ All transfers are tracked in a water budget
  16. 16. MODFLOW 6 Highlight— Newton Formulation ▪Minimizes wetting and drying complications ▪Synthesizes capabilities in MODFLOW-NWT and MODFLOW-USG
  17. 17. MODFLOW 6 Development Efforts ▪ Generalized particle tracking for MODPATH ▪ Skeletal Storage, Compaction and Subsidence (CSUB) Package ▪ MODFLOW as a callable resource with BMI Interface (USGS and Deltares) ▪ Variable K with Depth (VKD) Package (British Geological Survey) ▪ Linear Network Flow (LNF) Model (GSI Environmental) ▪ MT3D-USGS (SSPA) ▪ Landscape Hydrology Model
  18. 18. Generalized Particle Tracking ▪ Pollock’s method tracks particles on rectangular (and quad- refined) meshes ▪ Want to generalize it to work on arbitrary, unstructured MODFLOW 6 grids ▪ Define vertex velocities and use barycentric interpolation on triangles within convex polygon cells vn vn v vn vn
  19. 19. Transport Model ▪ New model type in MODFLOW 6, developed in collaboration with (GSI Environmental) ▪ Compatible with unstructured grids and the Newton flow formulation ▪ Uses packages to represent transport processes
  20. 20. Variable-Density Flow Capabilities ▪ Expanded SEAWAT capabilities for MODFLOW 6, developed in collaboration with (GSI Environmental) ▪ Unstructured grids and Newton flow formulation
  21. 21. Compaction and Subsidence Package ▪ Package simulates storage changes and compaction from coarse and fine grained (interbeds) sediments and water compressibility ▪ Package based on MODFLOW-2005 SUB and SUB-WT Packages ▪ Effective stress formulation ▪ Effective stress dependent storage properties ▪ Water table dependent compaction ▪ Elastic and inelastic compaction of fine-grained sediments ▪ Interbeds can be simulated as no-delay and delay beds
  22. 22. MODFLOW with BMI interface ▪ In cooperation with Martijn Russcher (Deltares)
  23. 23. Parallel Multi-Model Solutions ▪ In cooperation with Jarno Verkaik and Martijn Russcher (Deltares) 1.25 billion active cells, 480 submodels
  24. 24. FloPy ▪ Python package ▪ Full support for MODFLOW 6 ▪ Tools for building different types of grids ▪ Exporting ▪ Plotting ▪ Used for MODFLOW 6 development and testing
  25. 25. Continuous Integration ▪ Open development (public Github repository) ▪ Version control using Git ▪ Issue tracking ▪ Fork, branch, pull request ▪ Automatic documentation generation ▪ Automatic FloPy support ▪ Automated testing
  26. 26. Github Repository
  27. 27. Travis Testing
  28. 28. Travis Test Results
  29. 29. Online Resources ▪ MODFLOW-USGS GitHub Organization ▪ MODFLOW 6 ▪ MODFLOW 6 Examples ▪ MT3D-USGS ▪ MODFLOW-USG ▪ MODPATH 7 ▪ Executables ▪ FloPy repository
  30. 30. Summary ▪ The USGS continues to support, develop, modernize and apply MODFLOW to a wide variety of problems ▪ Development efforts are focusing on adding new capabilities to MODFLOW 6 (subsidence, transport, parallelization, etc.) ▪ Development efforts are being done in the open using version control and continuous integration practices
  31. 31. QUESTIONS?

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