Mobile Sources in PUFF

The Gaussian PUFF Model can also represent one or more mobile emission sources in the model domain.

Single mobile point source

This simples case is linked to the Mobile Source emission object; a Mobile Source OBJECT is simlar to a point source (smalol stack), but has three additional button links in the header:

MultiPUFF, the basic scenario interface and results display;
Trajectory, that describes the movement of the object in the domain together with the hips "activity level" (a multiplier for the average substance-specific emissions) at each location and time step;
Run the model scenarios interface and dialog.

Object properties

The Mobile Source is a standard OBJECT with header, META data, and a set of attributes the user can edit. This includes hypertext and imagery, a contact button for the administrative data (owner/oprtator address and contact information), basic description and properties including source categotry, type, model, size, engine type, rating/horespower, fuel (the list of attributed is open and controlled by the corresponding Object TEMPLATE), and the substance specific emission rates for "normal operation".

MultiPUFF the model scenario is defined by:
- a model domain, that also defines the meteorological data source, and spatial resolution;
- A START TIME (YYYYMMDDHH[mm])
- the duration of the model scenario and run (default: 24 hours; this value is read only, defined with the source trajectory and the model scenario interface)
- The substance that will be displayed;
- The model results display options, including the basic map overaly, tape deck, color coding editor diaslog, details page, animation, and scenario comparison..
Trajectory leads to an editor page that supports:
- zooming the domain background map;
- editing the mobile source trajectory and associated activity levels:
  selecting aposition on the map (left mouse button) will copy its coordinated into the list of coordinates left of the map; the user then defines the TIME STAMP (in minutes of elapsed time after the STARTTIME, and the associated activity level, synmbolic, or as a numerical multiplier for the average emission rates. To change emission while the source is at a fixed location, the coordinates for this locationm need to be repeated with a different TIMESTAMP and emission factor.
Model Dialog offers several model specific parameters (including output time step) and starts the model run; depending on the expected duration of the run (for a single source the model takes approximately 30 seconds per hour simulated) the model offer notification of the completion of the run by eMail or optional SMS.