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Processing MODFLOW (PMWIN)

Detailed Description

Processing MODFLOW  (PMWIN)

Processing MODFLOW  (PMWIN)





Introduction

Processing MODFLOW for Windows (PMWIN) is the most complete simulation system in the world. It comes complete with a professional graphical preprocessor and postprocessor, the 3-D finite-difference ground-water models MODFLOW-88, MODFLOW-96, and MODFLOW 2000; the solute transport models MT3D, MT3DMS, RT3D and MOC3D; the particle tracking model PMPATH 99; and the inverse models UCODE and PEST-ASP for automatic calibration. A 3D visualization and animation package, 3D Groundwater Explorer, is also now included.

PMWIN Graphical Data Input Features

  • PMWIN is capable of using all available memory. It can handle models with up to 1,000 stress periods, 80 layers and 250,000 cells in each layer. The model grid can be shifted, rotated, and refined. Model data can be specified for each finite difference cell individually, in the form of zones, or even automatically interpolated by the built-in Digitizer and the Field Interpolator.
  • Imports geo-referenced raster graphics (bitmap) and vector graphics (DXF or Line Map) as background site maps.
  • Imports any kind of existing standard MODFLOW models.
  • Imports SURFER grid files; Exports SURFER data files.
  • The telescopic mesh refinement feature allows the user to create higher resolutionlocal-scale flow models from a steady-state or transient regional flow model. PMWIN automatically transfers the results of the regional model as the boundary condition for the local-scaled submodel.
  • Checks models for potential problems prior to running the simulation.


PMWIN's Advanced Modeling Capability with the Fully-Supported Models

  • MODFLOW - PMWIN supports the simulation of the effects of wells, rivers, reservoirs, drains, head-dependent boundaries, time-dependent fixed-head boundaries, cut-off walls, compaction and subsidence, recharge and evapotranspiration. In addition to these standard packages of MODFLOW-96, PMWIN includes the unique Density package for taking into account the density driven flow rates into flow models. The latest versions of MODFLOW-2000 and PEST are also supported and included in this module for enhanced parameter estimation capability such as estimation of heterogeneous distributed parameters using hydraulic head and flow observations. In addition, the capability of using the reactive model MT3D99 enables PMWIN to analyze natural attenuation and biodegradation (PMWIN supports MT3D99 but it is not included).
  • PMPATH 99 allows you to perform particle tracking with just a few clicks of the mouse. Both forward and backward particle tracking schemes are allowed for steady-state and transient flow fields. PMPATH calculates and animates the particle tracking processes simultaneously and provides various on-screen graphical options including head contours, drawdown contours and velocity vectors.
  • MT3D can be used to simulate changes in concentration of single species miscible contaminants in groundwater considering advection, dispersion and simple chemical reaction.
  • MT3DMS is the next generation of MT3D; MS stands for Multi-Species. PMWIN provides full support for MT3DMS and can take advantage of its capabilities by using the new solution schemes. Up to 30 different species can be simulated with PMWIN.
  • MOC3D is the latest development of the popular 2D MOC model. It features advection, dispersion and simple chemical reaction.
  • RT3D simulates three-dimensional, multispecies, reactive transport in groundwater.
  • PEST and UCODE - Simply specify the observation data and define zones of parameters with the powerful data editor of PMWIN. The following model parameters can be automatically calibrated: (1) horizontal hydraulic conductivity or transmissivity; (2) vertical leakance; (3) specific yield or confined storage coefficient; (4) pumping rate of wells; (5) conductance of drain, river, stream or head-dependent cells; (6) recharge flux; (7) maximum evapotranspiration rate; and (8) inelastic storage factor.


PMWIN's Sophisticated Modeling Tools

  • Using the Presentation Tool, you can create labeled and color-filled contour maps of any kind of data including input data and simulation results. Report-quality graphics may be printed (with preview) or saved to several file formats including SURFER, DXF, HPGL, and BMP (Windows Bitmap). The Presentation Tool can even create and display two-dimensional animation sequences using the simulation results.
  • PMWIN provides a powerful Results Extractor. This tool allows you to extract results from any stress period, time step and layer and put them into a spread sheet. You can examine the results, create contour plots with PMWIN or save them in ASCII format or SURFER-compatible files.
  • The Field Interpolator takes point-wise measurement data and interpolates the data to the model grid. The model grid can be irregularly spaced.
  • The Field Generator generates fields with heterogeneously-distributed transmissivity or hydraulic conductivity values. It allows the user to statistically simulate effects and influences of unknown small-scale heterogeneities.
  • The Water Budget Calculator not only calculates the budget of user-specified zones but also the exchange of flows between such zones. This facility is very useful in many practical cases. It allows the user to determine the flow through a particular boundary.
  • The Graph Viewer displays scatter diagrams to aid in model calibration and temporal development curves of simulation results including hydraulic heads, drawdowns, subsidence, compaction and concentrations.

PMWIN's Comprehensive On-line Documentation, Help, Tutorials and Examples

  • PMWIN features a very comprehensive On-line Help system and includes a 300-page user's guide and 3,000 pages of documentation of the supported models in the Acrobat (PDF) format. All documentation is delivered on a single CD-ROM and can be viewed or printed at any time.
  • Three step-by-step tutorials describe the basic skills of steady-state and transient flow simulation, transport simulation and automatic calibration.
  • The topics of more than 60 documented ready-to-run example models include multi-layer wells, catchment areas, automatic calibration, pumping test (Theis and Hantush solutions), cut-off wall, seepage surface, flow net, seepage rate, stochastic modeling and simulation of lakes, compaction and solute transport.

PMWIN Requirements: Pentium with Windows 95/98/2000/NT 4.0 and 16 MB RAM (32 MB or more recommended).



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