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| General Listing |
Title of Listing: | | MODFLOW-96 |
Category: | | Software/Models |
Subcategory: | | Government, All Listings |
Date: | | |
Document #: | | |
Web Site: | | http://water.usgs.gov/software/modflow96.html |
Email: | | h2osoft@usgs.gov |
Abstract: | |
MODFLOW is a three-dimensional finite-difference ground-water flow model. It has a modular structure that allows it to be easily modified to adapt the code for a particular application. Many new capabilities have been added to the original model. OFR 96-485 (complete reference below) documents a general update to MODFLOW, which is called MODFLOW-96 in order to distinguish it from earlier versions
MODFLOW simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined. Flow from external stresses, such as flow to wells, areal recharge, evapotranspiration, flow to drains, and flow through river beds, can be simulated. Hydraulic conductivities or transmissivities for any layer may differ spatially and be anisotropic (restricted to having the principal direction aligned with the grid axes and the anisotropy ratio between horizontal coordinate directions is fixed in any one layer), and the storage coefficient may be heterogeneous. The model requires input of the ratio of vertical hydraulic conductivity to distance between vertically adjacent block centers. Specified head and specified flux boundaries can be simulated as can a head dependent flux across the model's outer boundary that allows water to be supplied to a boundary block in the modeled area at a rate proportional to the current head difference between a "source" of water outside the modeled area and the boundary block. MODFLOW is currently the most used numerical model in the U.S. Geological Survey for ground-water flow problems. An efficient contouring program is available (Harbaugh, 1990) to visualize heads and drawdowns output by the model.
Available for download on the WWW.
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Topics
Groundwater Characterization
Additional Topics/Tags/Keywords
Free Download, Groundwater Flow, Finite Difference Model
Organization: | | US Geological Survey (USGS), Hydrologic Analysis Software Support Team |
Address: | | 437 National Center
| Phone: | Description | Number |
City: | | Reston | | | |
State/Province/Territory: | | VA | 2. | | |
Zip/Postal Code: | | 20192 | 3. | | |
Country: | | United States | 4. | Fax: | |
Branch Locations: | |
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