Lohmeyer GmbH & Co. KG

Version SAM-S - System for the Calculation of Air Pollutant Concentrations



SAM-S is a PC based on-line system for the simulation of the dispersion of air pollutants during and after an accidental release at stationary (fixed installations) or mobile (for example transportation) sources. SAM-S calculates the airborne pollutant concentration in a area up to approx. 30 km x 30 km and shows as result isolines of the concentration on maps.

During a run SAM-S calculates at a time the

  • Concentration distribution at the actual time (= diagnosis) and the
  • Expected concentration distribution in the future (= prognosis), max. 2 hours in advance.

The diagnosis is updated every 3 minutes.

The basic version of SAM-S contains the following modules:

  • Gaussian cloud modell based on guideline VDI 3945 sheet 1
  • Mesoscale diagnostic complex terrain wind field model. Used for the extrapolation of measured meteorological data (10 minutes average of wind speed, wind velocity, turbulence and atmosperic stability) at one or several meteorological stations.
  • Release rate model for gases, liquids and liquid gases with pool evaporation.
  • Substance and scenario database

At the moment the following extention modules are available:

  • Dispersion calculation in build-up areas on basis of precalculated MISKAM wind fields.
  • Integration of nocturnal drainage flow fields
  • Database for measured concentrations
  • Source term calculation module including measuring location proposal
  • Facility database
  •  Warning at predefined locations

System requirements

SAM-S runs on PC's with at least 2 GHz and 512 MB RAM. WINDOWS 2000 or XP is recommend as operating system. If necessary a modem card or a RS422 interface card for the transfer of meteorological data must be added to the PC.


USA-1 Meteorological data (10 minutes average of wind speed, wind velocity, turbulence and atmosperic stability) of one or serveral meteorological stations is needed by SAM-S.

Customer reviews

  1. By Ravindra Kode on

    It's very useful software for new township projects In India ----where population is dense .Dr.Ravindra Kode , Functional Area Expert/ Quality council of India.Environment Impact Assessment e-mail ravindrakode@hotmail.com