Example of Transient Groundwater Flow Modeling with MODFLOW 6 - Tutorial

GeneralView.png

Based on the new file format and keywords from MODFLOW 6 it is more simple to understand a model while inspecting the input files. This tutorial show a example of a steady and transient flow model in MODFLOW 6 for a period of 30 days divided into 4 stress periods. The tutorial has a introduction to the model geometry, input files and boundary conditions, a model simulation in transient flow conditions and output visualization as VTU files in Paraview. The tutorial also includes a discussion on the water balance from the groundwater flow system at the end of the simulation.

The model used in this tutorial has the following characteristics:

  • 3 layers, 15 rows, and 10 cols
  • Constant grid width of 40 m, total thickness of 180 m.
  • Implementation of GHB, RIV, EVT,  WEL packages
  • RCH was implemented on 3 packages for specified cells
  • Observation package for a multilevel piezometer
  • Time series for GHB, RCH, RIV, WEL in additional files
  • 1 steady state stress period of 1 day 
  • 3 transient stress period of 10 days divided in 120 stress period

This model is a version of the "AdvGW_tidal" from the MODFLOW 6 documentation.

 

Figures

Model discretization

Isometric View of the Model Grid

Isometric View of the Model Grid

Boundary conditions

Isometric View of Boundary Conditions: RIV (green), WEL (purple), and GHB (light blue)

Isometric View of Boundary Conditions: RIV (green), WEL (purple), and GHB (light blue)

Groundwater flow regime at the end of simulation

Isometric View of Equipotential Surfaces with Boundary Conditions

Isometric View of Equipotential Surfaces with Boundary Conditions

 

Tutorial

Part 1

Part 2

 

Input files

You can download the input files from this tutorial on this link.

 

Saul Montoya

Saul Montoya es Ingeniero Civil graduado de la Pontificia Universidad Católica del Perú en Lima con estudios de postgrado en Manejo e Ingeniería de Recursos Hídricos (Programa WAREM) de la Universidad de Stuttgart con mención en Ingeniería de Aguas Subterráneas y Hidroinformática.

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