IMMISmt - Modules
IMMISmt can be composed individually according to specific requirements.
The modular architecture ensures flexible solutions for the customer which can be extended any time.
Below, the different components are described:
- mt-Scheduler (base system)
The mt-Scheduler controls single processes within the scope of the IMMISmt model system in a time- and state-dependent manner. It controls data supply, modelling chain and data publication. Additionally, the scheduler controls the data pre-processing of various interfaces.
mt-Core (base system)
mt-Core represents the core functionality of IMMISmt and is triggered by the mt-Scheduler to carry out the calculations for a single time step. Within a time step, mt-Core controls all necessary model runs (traffic emissions, background concentrations, additional and total concentrations as well as NO2-calculations). For a successful model run, current data on traffic, meteorology and pollutant concentrations need to be provided.
In operational mode, mt-Core can be run without a user interface reporting in log files. For manual calculations or in simulation mode (recalculating from archive) mt-Core offers a Windows-based user interface to control single processes.
The mt-Archive stores all data of model runs. The database stores input data (traffic, meteorological and measurement data), intermediate results (emissions) and results for each model run. Data from the archive is available for the mt-Simulator to be used as input data for scenarios. The archive also provides modelled data for statistical analyses with mt-Analyser.
- mt-Simulator (optional, only with mt-Archiv)
The mt-Simulator offers the possibility to re-calculate single or several consecutive time steps. Data stored in the mt-Archive database can be used to simulate different scenarios in order to assess the impact of traffic control measures. Results will also be saved in the archive and tagged with a unique run_ID, distinguishing operational data from simulation data. Results of the simulations can be visualised with the mt-Viewer.
mt-Viewer (optional, only with mt-Archiv)
The mt-Viewer is a tool to visualise IMMISmt data, showing times series, charts and spatial distributions of concentration on the entire network for a selected point in time.
mt-Analyser (optional, only with mt-Archiv)
The mt-Analyser is a workbench to analyse the archived data statistically. The methods cover all main statistical parameters and can be applied to user defined time spans and selected road sections.
The mt-Alerter warns in case a pollutant exceeds a threshold value. Hence it can be used to initiate traffic related measures to prevent violations of limit values. Threshold values can be defined for individual receptors, sections, streets, or for the entire road network. Exceedances will be displayed on screen and/or can be transmitted by e-mail or SMS to relevant personnel.
The module mt-Noise calculates noise levels in the streets based on RLS90 and Schall03.
For calculating noise emissions, additional data is needed:
For the calculation of noise levels, the method "long straight line" is applied needing the following parameters:
- average frequencies of trains (streetcars or subway),
- corrections for maximum speeds,
- corrections for pavement type, conditions of roads and tracks,
- additions for slopes and
- corrections for the influence of single reflection.
- supplements for traffic signal controlled crossings and junctions,
- distances and air absorption,
- ground and meteorological absorbability and
- multiple reflections of street canyons.