Skip to Main Content U.S. Department of Energy
DUSTRAN/SPRAYTRAN - A GIS-based Dispersion Modeling System

DUSTRAN

DUSTRAN is a comprehensive dispersion modeling system, consisting of a dust-emissions module, a diagnostic meteorological model, and dispersion models that are integrated seamlessly into MapWindow's open-source GIS. DUSTRAN functions as a console application within MapWindow and allows the user to interactively create a release scenario and run the underlying models. Through the process of data layering, the model domain, sources, and results—including the calculated wind vector field and plume contours—can be displayed with other spatial and geophysical data sources to aid in analyzing and interpreting a scenario.

Fundamental to the DUSTRAN modeling system is a dust-emissions module that includes algorithms for calculating dust emissions from both active and natural sources. Active sources include vehicular dust generation from paved and unpaved roadway surfaces as well as emission factors for various wheeled and tracked military vehicles and the widely used AP-42 emission factors. Natural sources include wind-blown dust generation from a user-specified domain and are a function of surface wind stress, soil type, and vegetation type. In either case, dust emissions are calculated for explicit particulate matter (PM) size classes, including PM2.5, PM10, PM15, and PM30.

Example of a point and area source simulation in DUSTRAN.  The area source represents vehicular movement over a broad area (click image to enlarge).
Example of a point and area source simulation in DUSTRAN.  The area source represents vehicular movement over a broad area (click image to enlarge).

In DUSTRAN, dust transport, diffusion, and deposition are simulated using one of three dispersion models—AERMOD, CALPUFF, or CALGRID. Three dispersion models are used due to their frames-of-reference in calculating plume transport, allowing DUSTRAN users to take advantage of each model’s inherent strengths in simulating different source types and transport distances:

  • AERMOD. A steady-state plume model for near-field (<50 km) dispersion and particle deposition from active-source emissions (i.e., point, area, or line). AERMOD incorporates planetary boundary layer turbulence structure and scaling concepts, including treatment of surface and elevated sources and simple and complex terrains.
  • CALPUFF. A non-steady-state puff dispersion model for long-range (>50 km) dispersion and particle deposition from active-source emissions (i.e., point, area, or line). CALPUFF simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation, and removal in both simple and complex terrains.
  • CALGRID. An Eulerian dispersion model used for wind-blown dust emissions, where the entire model domain is a potential emission source.

In addition to the AERMOD and CALPUFF regulatory versions, modified versions of both models have been included in DUSTRAN. The modified versions implement a dry-deposition algorithm based on experimental data from the Desert Research Institute (DRI).

Each dispersion model has a suite of preprocessors included in DUSTRAN for extracting terrain and meteorological data for use in the dispersion calculations. All the model components are dynamically linked by the DUSTRAN interface. The DUSTRAN User's Manual provides a complete overview of the underlying models within DUSTRAN, including a detailed discussion of the vehicular and wind-blown dust emission modules.

A detailed description of the DUSTRAN modeling system is available in the DUSTRAN User Manual.

DUSTRAN