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Moving source of emission

Posted: August 18th, 2020, 7:56 am
by musaidpp
Helo ,
I would like to know is there any provision to represent the source of emission as a moving point source in Hysplit in order to get the concentration dispersion over a period?
I have made a simulation for 6hrs for an emission at 4km above ground at 0900 UTC. and the particle cross section can be seen in the pdf. This is a single emission, but what if i want to multiple emissions from the same source, but falling down under gravity.?

Thank you.

Re: Moving source of emission

Posted: August 20th, 2020, 1:44 pm
by musaidpp
Here is my set up file as well.

Re: Moving source of emission

Posted: August 31st, 2020, 9:46 am
by ariel.stein
You are on to the correct approach to define a moving source by using the EMITIMES file. Although the help file S417.htm mentions that the file can be used to define a moving source, no specific instructions are provided. As an example, the EMITIMES file you provided has been modified to redefine the source at 10 minute intervals, with each new emission period dropping in height by 200 m. In this case each emission is at the same lat-lon location, but those values can be changed as well if desired. The most important thing to remember is that since you now have six data records in the EMITIMES file instead of one, you now need to define six starting locations in the CONTROL file to properly initialize the emission variables at model startup. The exact locations in the CONTROL file are not important as those values will be replaced by the ones in the EMITIMES file.