Model:MODFLOW 6

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MODFLOW 6

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as MODFLOW Model type Modular Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 3D Spatial extent Global, Continental, Regional-Scale, Landscape-Scale, Watershed-Scale, Reach-Scale, Patch-Scale Model domain Terrestrial, Hydrology, Coastal One-line model description MODFLOW 6 is an object-oriented program and framework developed to provide a platform for supporting multiple models and multiple types of models within the same simulation Extended model description MODFLOW 6 is an object-oriented program and framework developed to provide a platform for supporting multiple models and multiple types of models within the same simulation. This version of MODFLOW is labeled with a "6" because it is the sixth core version of MODFLOW to be released by the USGS (previous core versions were released in 1984, 1988, 1996, 2000, and 2005). In the new design, any number of models can be included in a simulation. These models can be independent of one another with no interaction, they can exchange information with one another, or they can be tightly coupled at the matrix level by adding them to the same numerical solution. Transfer of information between models is isolated to exchange objects, which allow models to be developed and used independently of one another. Within this new framework, a regional-scale groundwater model may be coupled with multiple local-scale groundwater models. Or, a surface-water flow model could be coupled to multiple groundwater flow models. The framework naturally allows for future extensions to include the simulation of solute transport. Keywords: groundwater, transport, Water quantity, water quality, lakes, Shallow-water model, soil moisture, compaction, , Name Joseph Hughes Type of contact Model developer Institute / Organization U.S. Geological Survey Postal address 1 12201 Sunrise Valley Drive Postal address 2 Town / City Reston Postal code 20192 State Virginia Country United States Email address modflow@usgs.gov Phone Fax Name Christian Langevin Type of contact Model developer Institute / Organization U.S. Geological Survey Postal address 1 2280 Woodale Drive Postal address 2 Town / City Mounds View Postal code 55112 State Minnesota Country United States Email address modflow@usgs.gov Phone Fax Supported platforms Unix, Linux, Mac OS, Windows Other platform Programming language Fortran90 Other program language Code optimized Single Processor, Multiple Processors Multiple processors implemented Distributed memory Nr of distributed processors Nr of shared processors Start year development 1979 Does model development still take place? No If above answer is no, provide end year model development Code development status Active When did you indicate the 'code development status'? 2023 Model availability As code, As teaching tool Source code availability (Or provide future intension) Through web repository Source web address https://www.usgs.gov/software/modflow-6-usgs-modular-hydrologic-model Source csdms web address Program license type Other Program license type other CC0 1.0 Memory requirements Typical run time Describe input parameters see MODFLOW 6 Description of Input/Output at https://water.usgs.gov/water-resources/software/MODFLOW-6 Input format ASCII, Binary Other input format Describe output parameters see MODFLOW 6 Description of Input/Output at https://water.usgs.gov/water-resources/software/MODFLOW-6 Output format ASCII, Binary Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model MODFLOW 6 presently contains two types of hydrologic models, the Groundwater Flow (GWF) Model and the Groundwater Transport (GWT) Model. The GWF Model for MODFLOW 6 is based on a generalized control-volume finite-difference (CVFD) approach in which a cell can be hydraulically connected to any number of surrounding cells. Users can define the model grid using 1. a regular MODFLOW grid consisting of layers, rows, and columns, 2. a layered grid defined by (x, y) vertex pairs, or 3. a general unstructured grid based on concepts developed for MODFLOW-USG. For complex problems involving water-table conditions, an optional Newton-Raphson formulation, based on the formulations in MODFLOW-NWT and MODFLOW-USG, can be activated. The GWF Model is divided into "packages," as was done in previous MODFLOW versions. A package is the part of the model that deals with a single aspect of simulation. Packages included with the GWF Model include - those related to internal calculations of groundwater flow (discretization, initial conditions, hydraulic conductance, and storage), - stress packages (constant heads, wells, recharge, rivers, general head boundaries, drains, and evapotranspiration), and - advanced stress packages (streamflow routing, lakes, multi-aquifer wells, and unsaturated zone flow). An additional package is also available for moving water available in one package into the individual features of the advanced stress packages. The GWF Model also has packages for obtaining and controlling output from the model. The GWT model for MODFLOW 6 simulates three-dimensional transport of a single solute species in flowing groundwater. The GWT Model solves the solute transport equation using numerical methods and a generalized CVFD approach, which can be used with regular MODFLOW grids or with unstructured grids. The GWT Model is designed to work with most of the new capabilities released with the GWF Model, including the Newton flow formulation, unstructured grids, advanced packages, and the movement of water between packages. The GWF and GWT Models operate simultaneously during a MODFLOW 6 simulation to represent coupled groundwater flow and solute transport. The GWT Model can also run separately from a GWF Model by reading the heads and flows saved by a previously run GWF Model. The GWT model is also capable of working with the flows from another groundwater flow model, as long as the flows from that model can be written in the correct form to flow and head files. Describe key physical parameters and equations Describe length scale and resolution constraints Describe time scale and resolution constraints Describe any numerical limitations and issues Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets Test data sets are provided as part of releases available at https://www.usgs.gov/software/modflow-6-usgs-modular-hydrologic-model to verify that MODFLOW 6 is correctly installed and running on the system. Test data sets are also available from https://github.com/MODFLOW-USGS/modflow6-examples (and viewable online at https://modflow6.readthedocs.io/), https://github.com/MODFLOW-USGS/modflow6-testmodels, and https://github.com/MODFLOW-USGS/modflow6-largetestmodels The tests may also be looked at as examples of how to use the program. Upload test data sets if available: Describe ideal data for testing Do you have current or future plans for collaborating with other researchers? Is there a manual available? Yes Upload manual if available: Media:Tm6a57.pdf, Media:Tm6a55.pdf, Media:Tm6a56.pdf, Media:Tm6a61.pdf, Media:Tm6a62.pdf Model website if any https://www.usgs.gov/software/modflow-6-usgs-modular-hydrologic-model Model forum / discussion board https://github.com/MODFLOW-USGS/modflow6/discussions and https://groups.google.com/g/modflow Comments This part will be filled out by CSDMS staff OpenMI compliant Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "Code openmi compliant or not" property. BMI compliant Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "BMICompliant" property. WMT component Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code CMT compliant or not" property. PyMT component Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code PyMT compliant or not" property. Is this a data component No DOI model For model version Year version submitted Link to file Can be coupled with: CanCoupleWith,

Model info Authors Joseph Hughes Langevin Source code Go to external source code site Model citations Nr. of publications: -- Total citations: 0 h-index: --"--" is not a number. m-quotient: 0 QR-code Link to this page Other models by author MODFLOW 6

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