ModIME

ModIME DESCRIPTION

Introduction to ModIME
ModIME Key Features
ModIME Zoom Capability
Steps in the ModIME Modeling Process
ModIME Requirements
 

INTRODUCTION TO ModIME

ModIME is a Modular Integrated Modeling Environment for three widely-used ground-water flow, particle tracking, and solute transport models: MODFLOW, PATH3D, and MT3D. ModIME allows the user to prepare input data, run the model code, and postprocess the results of simulations interactively in an intuitive graphical environment. The most obvious advantage of ModIME is that the user no longer has to assemble the formatted input files for the simulation codes. More important, the integrated modeling environment provides a framework for organizing and checking the large volumes of data typically required for a field-scale model. The tasks of model construction and calibration are streamlined, and the efficiency of the modeler is increased dramatically. ModIME also features an innovative "zoom" capability enabling the user to construct independent local-size models with a regional model.

ModIME KEY FEATURES

• Fully-graphical environment. A graphical preprocessing environment for specifying the model parameters and assembling the model database files. The full-screen graphical editor can be used to import files and to enter and modify input data directly on a display of the model grid and base map.
• Automatic file generation. Algorithms for automatically generating MODFLOW, PATH3D and MT3D input files from basic data such as aquifer hydraulic properties and river geometry and stages.
• Zoom capability. A zoom capability for designing and executing higher resolution calculations in subregions of the model.
• Full postprocessing capabilities. A graphical postprocessing environment for displaying and analyzing the MODFLOW, PATH3D and MT3D simulation results. Postprocessing capabilities include displaying areal and cross-sectional water level and concentration contour maps, pathlines, hydrographs, drawdown, drawdown-time curves, and concentration breakthrough curves at selected monitoring locations. ModIME can be used to compare observed and simulated water levels and concentrations and produce detailed flow budgets.
• Comprehensive on-line help.

ModIME ZOOM CAPABILITY

Have you ever developed a ground-water model that was regional in scale and then tried to use that model to answer local-scale questions? Do you remember how painful it was to go back and refine your regional model or to develop a finer-resolution submodel?

STEPS IN THE ModIME MODEL DEVELOPMENT AND APPLICATION PROCESS

• Design the spatial and temporal discretization. The model grid can be designed and modified directly over a base map, using the graphical grid generator. Time is discretized into stress periods, time steps for the flow simulation and transport steps for the solute transport simulation.
• Set the simulation options. The next step is to set the global options for the simulation. After setting the global options, the user defines the options and solution-control parameters specific to the analysis; for example, which packages are to be used in the MODFLOW flow simulation. Simulation options and data are defined on a layer-by-layer basis and are specified from the keyboard or mouse.
• Build the model databases. Two- and three-dimensional arrays are assembled in databases with simple formats. Array values may be assigned graphically or by pointing and clicking with the mouse. They may also be imported from previously gridded files or interpolated from a set of point values. The ease and speed with which the data files can be checked and revised is one of the most useful features of ModIME. The array values are re-gridded automatically if the model grid is modified.
• Generate the model input files and execute the simulation codes. A unique file-generator program in ModIME automatically creates the model input files based on the specified options and the contents of the database files. The simulation codes are executed from within ModIME after the input files have been generated.
• Postprocess the simulation results. ModIME displays areal and cross-sectional distributions of hydraulic heads, drawdown, and concentrations. Pathlines from particle tracking analyses can be superimposed on the displayed heads. Hydrographs for transient flow simulations and breakthrough curves for solute transport analyses can be displayed. ModIME also includes utilities that assist in the calibration of flow models including the evaluation and display of residuals between observed and computed heads, calibration statistics, and detailed flow-budget calculations.
• Perform local-scale simulations. The zoom-capability feature makes it possible to perform higher resolution simulations over a limited portion of a regional model making it possible to construct refined local-scale models within a regional model. Data for material properties and stresses are transferred automatically to the local model, and the boundary conditions are determined automatically from the results of the regional-scale simulation. ModIME also allows users to treat local-scale models as stand-alone models.

ModIME Requirements: PC 486/Pentium with 4 MB RAM, and 10 MB free memory. ModIME is compatible with all versions of MODFLOW, PATH3D and MT3D.

Τελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27th 2004
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