Question about 'Number of particle and puff'

Topics about the HYSPLIT dispersion model.
Post Reply
sol
Posts: 6
Joined: February 5th, 2020, 9:24 pm
Registered HYSPLIT User: No

Question about 'Number of particle and puff'

Post by sol » February 7th, 2020, 10:31 am

Dear all

I have simple questions about number of particle and puff.
I am running hysplit dispersion model with the default_conc condition as below.

Code: Select all

17 06 19 03
1
35.41 126.42 50.0
165
0
10000.0
1
D:/과제/01_방사능/04.소프트웨어/방사능과제_건기원/api2arl_window/api2arl_Win_OS_051719/api2arl_Win_OS_051719/
170619_7days_incl_rain
1
C137
1.05E+15
165
17 06 19 03 00
1
35.55 127.08
0.03 0.03
3.3 3.04
./
Hanbit170619
1
0
17 06 19 03 00
17 06 25 00 00
00 03 00
1
0.4 1.9 1.0
0.002 136.96 0.0 0.0 0.0
0.0 3.2E-05 5.0E+05
10960.0
1.0E-06
As you can see, the emission rate is '1.05E+15'. and when i ran a dispersion model with this emission rate, i got ' WARNING emspnt: exceeding puff limit' message like i attached message file.

here are questions.
1. Do i get a same conclusion through reduce emission rate and increase concentration number of conversion options? for example, if i reduce emission rate as '1.05E+4' and increase concentration number of conversion options as 10E+11, then do i got same result with emission rate,1.05E+15, and concentration number 1?
2. I set 'particle/puff release number limits' options like below

Code: Select all

Particles released per cycle : -100
Maximum number of particles : 500000
Maximum particle duration(hrs) :9999
Does these number related with emission rate? if so, what numbers are proper to fix 'exceeding puff limit' warning?
I want to set 168 hours of simulation time and i want continuous emission of pollutant condition.

Thank you advanced.
Attachments
SETUP.txt
(561 Bytes) Downloaded 33 times
CONTROL.txt
(415 Bytes) Downloaded 33 times
MESSAGE.txt
(269.53 KiB) Downloaded 32 times

barbara.stunder
Posts: 365
Joined: November 9th, 2012, 4:23 pm
Registered HYSPLIT User: Yes

Re: Question about 'Number of particle and puff'

Post by barbara.stunder » February 10th, 2020, 9:43 am

You are getting the "... exceeding..." message because the number of particles in the run reaches the maximum you specified (MAXPAR).
For a description of what is in the MESSAGE file, see https://ready.arl.noaa.gov/hysplitusersguide/S443.htm

You can increase the MAXPAR so you won't get the "exceeding" warning. For this long of a continuous release you may want to force a longer time step to 12 minutes or more. You can set this in the SETUP file using DELT=
See https://ready.arl.noaa.gov/hysplitusersguide/S610.htm

The mass in the emission rate is distributed among all the particles. The total mass on the particles during the run is shown in the right-hand column of the "NOTICE main" rows in the MESSAGE file. These seem to agree with what is in the CONTROL file.

sol
Posts: 6
Joined: February 5th, 2020, 9:24 pm
Registered HYSPLIT User: No

Re: Question about 'Number of particle and puff'

Post by sol » February 11th, 2020, 1:33 am

I really appreciate for your reply.
I had one more question.
If i set the NUMPAR as negative value, Is it okay to ignore 'exceeding puff limit' warning?
Does it represent dispersion of pollutant well? :?:

sol
Posts: 6
Joined: February 5th, 2020, 9:24 pm
Registered HYSPLIT User: No

Re: Question about 'Number of particle and puff'

Post by sol » February 11th, 2020, 2:51 am

I am very appreciate for your reply.
As your reply, I am planning to increase MAXPAR.
I got a few more question about number of particle and puff.

Q1. If i set NUMPAR as negative value, Then Does absolute value of NUMPAR continuously emitted even if NUMPAR exceeding number of MAXPAR situation?

Q2. What is relation with NUMPAR and MAXPAR? I could not understand explan of those values on the manual. Do they have any mathmatical relation? If there is, what is it?

Q3. If i set NUMPAR as negative value, Is it okay to ignore 'exceeding puff limit' warning? and Are those results proper results?

Q4. What is the biggest values of NUMPAR and MAXPAR which can be set?

Thank you in advanced.

sol
Posts: 6
Joined: February 5th, 2020, 9:24 pm
Registered HYSPLIT User: No

Re: Question about 'Number of particle and puff'

Post by sol » February 11th, 2020, 4:43 am

I have one more question.

Like your reply, I set increased MAXPAR value. but 'exceeding puff limit' warning keep appear.
I set MAXPAR as 3000000 and NUMPAR as -50.
And it spends too much time to run a dispersion model.
What should i do to get a results quickly with no 'exceeding puff limit' warning.
Actually I want this work,running dispersion model, spends less than 5 hours.

Please help! This problem get me a terrible headache.

alicec
Posts: 175
Joined: February 8th, 2016, 12:56 pm
Registered HYSPLIT User: Yes

Re: Question about 'Number of particle and puff'

Post by alicec » February 14th, 2020, 3:43 pm

Could you try the following and then send your MESSAGE file.

run with only the the following in your SETUP.CFG

&SETUP
NUMPAR = -100,
MAXPAR = 500000,
INITD = 0,
/

Also try just running for 24 hours at first. (change the 165 to 24 in line 4 of your CONTROL file)

17 06 19 03
1
35.41 126.42 50.0
24
0
10000.0
1


Thanks,
Alice

alicec
Posts: 175
Joined: February 8th, 2016, 12:56 pm
Registered HYSPLIT User: Yes

Re: Question about 'Number of particle and puff'

Post by alicec » February 14th, 2020, 4:37 pm

Please set the last value in your CONTROL file to 0.
You are using a pollutant resuspension factor which is causing new particles to be
emitted from the places that you have deposition.

If you do not use this then you will be able to emit 100 particles per hour using
numpar = -100
and you will not exceed your particle limit.

Alice

Post Reply