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Groundwater Remediation of Contaminated Sites

February 9th, 2016|Categories: Visual MODFLOW Flex|Tags: |

Using Visual MODFLOW for Groundwater Remediation of Contaminated Sites Groundwater models can be used to define the flow conditions at a contaminated site and to define the spatial and temporal distribution of the contaminant plume. Once the plume has been mapped out, groundwater models can also be used to evaluate the design of remediation scenarios, including: pump and [...]

Saltwater Intrusion in Coastal Aquifers

February 5th, 2016|Categories: Visual MODFLOW Flex|Tags: |

Using Visual MODFLOW and SEAWAT for Saltwater Intrusion Applications Saltwater intrusion is defined as the inland movement of seawater into aquifers previously occupied by freshwater. The causes include: climate change, groundwater pumping, higher evapotranspiration, lower recharge, anthropogenic causes, urban development (buildings, pavement, sewers, …), channelization of wetlands, agricultural practices, natural causes, etc. Figure 1: Saltwater intrusion in a coastal aquifer environment (Barlow, 2003) [...]

Particle tracking for MODFLOW-USG: A demonstration of mod-PATH3DU runs using Visual MODFLOW Flex

July 30th, 2014|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: , , |

The new particle tracking program mod-PATH3DU, developed by S.S. Papadopulos & Associates, provides a vital component for interpretation and analysis of MODFLOW-USG groundwater models. This program will be integrated into Visual MODFLOW Flex in a future release. The following images are some of examples of pathline analysis using mod-PATH3DU and UnStructured Grid models (Voronoi and Quad-Based [...]

A logical and flexible approach to creating Quad-Based UnStructured grids using Visual MODFLOW Flex

March 25th, 2014|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: , |

MODFLOW-USG gives you the flexibility to focus grid resolution where it counts, using a variety of grid geometries.  As mentioned in an earlier blog post, Quad-Based grids are an attractive option due to their simplicity and rectangular-shaped geometry (using shapes similar to those used in finite difference grids).  This blog article provides a preview of the  [...]

Utilizing layer-dependent discretization to accommodate a wide variety of grid-refinement needs for MODFLOW-USG

March 12th, 2014|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: , |

In 2013 Visual MODFLOW Flex demonstrated the power of MODFLOW-USG through the use of Voronoi polygon unstructured grids. By focusing the grid resolution “where it counts”, you can achieve higher accuracy and more efficient run times over structured MODFLOW grids. (See MODFLOW-USG Case Study). Building on the new capabilities of MODFLOW-USG and leveraging the flexibility that [...]

A Comparison of Groundwater Modeling Approaches: Conceptual vs Numerical

January 24th, 2014|Categories: Groundwater Modeling, Visual MODFLOW Flex|Tags: , , |

With the release of Visual MODFLOW Flex, we introduced a new streamlined approach to building groundwater models. Along with the traditional numerical modeling approach, we provided groundwater professionals with the option to develop MODFLOW groundwater models from a 3D conceptual model. By incorporating raw GIS data that is completely independent of a numerical grid, the conceptual [...]

Case Study: MODFLOW-USG Yields 90% Reduction in Run Times for Regional Groundwater Model

November 12th, 2013|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: |

One of the main benefits of MODFLOW-USG is that it is capable of achieving a high level of accuracy, with much fewer grid cells than what would be needed with MODFLOW-2005. In order to quantify the performance gains, we ran a benchmark test that compared the run time of MODFLOW-USG to the run time of MODFLOW-2005 [...]

Groundwater Modeling Numerical Methods: Which One Should You Use?

August 26th, 2013|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: , |

Those that are new to groundwater modeling are often overwhelmed with terms such as finite differences, finite elements, grid discretization and triangulation. Once you gain a basic understanding of the terms and the processes involved in groundwater modeling, you are often faced with the ultimate question "Which numerical method should I use for my project?" The [...]

Understanding MODFLOW-USG: A Comparison between Structured MODFLOW and UnStructured MODFLOW

August 22nd, 2013|Categories: Groundwater Modeling, MODFLOW-USG, Visual MODFLOW Flex|Tags: , |

The newly released MODFLOW-USG (UnStructured Grid version of MODFLOW) provides a significant advancement in groundwater modeling. Along with a new set of capabilities, there are several changes to the underlying MODFLOW concepts. Thus there is a need to better understand the differences and similarities between the UnStructured version of MODFLOW and traditional Structured versions of MODFLOW [...]