Search found 24 matches

by Tianfeng.Chai
June 16th, 2022, 3:27 pm
Forum: 13. Source attribution methods
Topic: Solutions for Section 13.5
Replies: 1
Views: 16117

Re: Solutions for Section 13.5

The "results" folder is used to store HYSPLIT simulation results. This section actually uses the source-receptor file srm.bin created in section 13.4. There are no new HYSPLIT runs. The statistical results and figures are included in the tutorial html pages.
by Tianfeng.Chai
June 15th, 2022, 4:51 pm
Forum: Dispersion Model
Topic: Does a dispersion model that goes backward provide useful informaiton?
Replies: 1
Views: 1059

Re: Does a dispersion model that goes backward provide useful informaiton?

Yes, the backward dispersion run by setting the integration time to a negative value gives useful information. The results provide the source-receptor sensitivities (which are sometimes called the footprint of the receptors/measurement). The forward model runs can provide such information as well. I...
by Tianfeng.Chai
April 27th, 2022, 2:18 pm
Forum: Dispersion Model
Topic: Deposition
Replies: 1
Views: 1423

Re: Deposition

Yes, your approach is correct in general. (26) 1 (Number of pollutants: I have one pollutant, pm2.5) (27) 0.8. 2, 1 (Diameter, density and shape: I used Rolph et al. 2009 as reference.) They are fine. 28(2)- Deposition velocity (m/s), Pollutant molecular weight (Gram/Mole), Surface Reactivity Ratio,...
by Tianfeng.Chai
June 18th, 2021, 4:14 pm
Forum: 14. Wildfire smoke and dust storms
Topic: Multiple fires at the same time?
Replies: 4
Views: 26089

Re: Multiple fires at the same time?

Heat will be important to calculate releae height for smoke emission (see section 14.1).
The example in 16.5 is for volcanic ash applications where the emission heights are explicitly provided in the EMITIMES file. In this case, HEAT is not used.
by Tianfeng.Chai
June 18th, 2021, 3:30 pm
Forum: 11. Pollutant transformations and deposition
Topic: vehicular emissions
Replies: 1
Views: 18494

Re: vehicular emissions

Although this thread is titled as "vehicular emissions", the content seems to indicate you are interested in straw stubble burning. It is possible to only issue burning permits when smoke generated from stubble burning has less effect to human health (e.g. smoke will not transport to populated area)...
by Tianfeng.Chai
June 17th, 2021, 12:07 pm
Forum: 6. Trajectory statistics
Topic: Interpreting Ensemble Results
Replies: 5
Views: 18419

Re: Interpreting Ensemble Results

Yes, I agree. Because of the stochastic feature of atmospheric flow, it is always better to have multiple trajectory runs instead of only relying on a single trajectory.
by Tianfeng.Chai
June 16th, 2021, 4:32 pm
Forum: 8. Configuring the CAPTEX simulation
Topic: #8.1 - check for release of 201kg
Replies: 4
Views: 24651

Re: #8.1 - check for release of 201kg

It is normal to have the max/min values differ from the results shown in the tutorial. However, if the differences are too much it may indicate something wrong.
by Tianfeng.Chai
June 16th, 2021, 4:24 pm
Forum: 8. Configuring the CAPTEX simulation
Topic: #8.1 - check for release of 201kg
Replies: 4
Views: 24651

Re: #8.1 - check for release of 201kg

'KG' at the very top shows the grid number. After a long list of "Namelist configuration", you will see the following ------------- Start computation messages ------------------- NOTICE advrng: (kg ,xyr,xy1) - 1 10 10 19 19 NOTICE metpos: (mtime,ftime) - 44039100 0 NOTICE metpos: (mtime,ftime) - 440...
by Tianfeng.Chai
July 6th, 2020, 7:08 pm
Forum: Radiological
Topic: Long-term dose estimation with con2rem
Replies: 2
Views: 16618

Re: Long-term dose estimation with con2rem

The explanation can be found in the user guide. Additional decay time can be added using this field to estimate long-term doses. This calculation applies to either -t option but only for deposition doses. This option permits longer-term doses to be computed by adding additional decay to the existing...
by Tianfeng.Chai
June 26th, 2020, 6:45 pm
Forum: 15. Radioactive pollutants and dose
Topic: Obtaining the concentration multiplier
Replies: 3
Views: 24061

Re: Obtaining the concentration multiplier

I believe the inhalation pathway that affects lungs is more important for radionuclide in the air. Inhalation conversion factor for Cs-137 used at NOAA is 4.60E-09 Sv/Bq. As 1 rem = 0.01 sievert (Sv), this Cs137 factor is 4.60E-11Rem/Bq The dose to human lungs due to breathing in Cs-137 in the air w...

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