How is the "lowest grid" defined in case of uneven ground?

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Pantamonium
Posts: 4
Joined: Thu Mar 19, 2020 8:59 am

How is the "lowest grid" defined in case of uneven ground?

Postby Pantamonium » Thu Mar 19, 2020 9:13 am

I'm sorry if this has been asked before, I haven't been able to find an answer using the search function.

So, ENVI-met has the option to sub-divide the lowest simulated grid into five sub-boxes to provide greater resolution for the height most relevant to humans. However, it is not clear to me what happens in case the ground level is not flat. In my case, the ground is sloping and the simulated area (about 200x200m) occupies the entire slope, which from lowest to highest point has a difference of about 20m. Does the "lowest grid" follow the ground? Will I be able to have the five box subdivision above ground in any location, or will the subdivision occur only at the lowest level of the slope?

Tim
Posts: 1219
Joined: Mon May 15, 2017 3:46 pm

Re: How is the "lowest grid" defined in case of uneven ground?

Postby Tim » Thu Mar 19, 2020 9:18 am

Hi,

It does not follow the terrain. That is why we recommend to not use splitting when DEM is used. Most parts of the model area would have the 5 high-resolution subcells within the terrain. You would not get more information from them and additional have more computational time than without splitting.

Best regards,
Tim

Pantamonium
Posts: 4
Joined: Thu Mar 19, 2020 8:59 am

Re: How is the "lowest grid" defined in case of uneven ground?

Postby Pantamonium » Thu Mar 19, 2020 9:22 am

Ok, thank you Tim! Do you know if there is a plan to implement something like this in the future? Or would it be too much of a strain in calculation time?

Tim
Posts: 1219
Joined: Mon May 15, 2017 3:46 pm

Re: How is the "lowest grid" defined in case of uneven ground?

Postby Tim » Thu Mar 19, 2020 9:47 am

Hi,

No, that is not planned, yet.

Best regards,
Tim


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