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RTDM: Rough Terrain Diffusion Model

The Rough Terrain Diffusion Model (RTDM) is an air quality model best suited for rural environments and multiple point sources. It accounts for terrain roughness and is prepared to compute a sequence of hourly intervals, by applying for each of them, a classical gaussian plume model. It daoe not consider deposition or chemical reactions.


area: air quality
objectives: simulation, forecasting
description: gaussian plume, microscale, hourly evaluations, multiple point sources, rural environment, short term, short range, inactive pollutant


You can download the software from
EPA - SCRAM Models

or directly: http://www.epa.gov/scram001/models/screen/rtdm32.zip(RTDM32 Model, PC Version, Executable - 160KB,ZIP)

The model is part of UNAMAP and is available on diskette from:
Computer Products
National Technical Information Service
U. S. Department of Commerce
Springfield, Virginia 22161
Phone (703) 487-4650


Robert J. Paine and Bruce A. Egan
Environmental Research and Technology, Inc.
Concord, MA


  • Environmental Research and Technology, 1987. USER'S GUIDE TO THE ROUGH TERRAIN DIFFUSION MODEL (RTDM), Rev. 3.20. ERT document NO. P-D535-585. Environmental Research and Technology, Inc., CONCORD, MA. (TO BE AVAILABLE FROM NTIS.)



Estratto dalla banca modelli del progetto CEE GAIA INCO - www.ess.co.at/GAIA