WRF crashes unexpectedly when conducting urban meteorological simulations using LCZ.

[nanyin]

Hello, I encountered this message while using W2W. When I was conducting urban meteorological simulations, WRF exited after only running for a few minutes. I wonder if this is related to the setting of my num_urban_nbui value. I found the Registry.EM_COMMON file and came across this information: rconfig integer num_urban_nbui derived 1 1 irh.

I modified it to: rconfig integer num_urban_nbui derived 1 10 irh, and then recompiled WRF. Unfortunately, W2W still prompts "Set nbui_max to 10 during compilation, in order to optimize memory storage" and WRF still exits after running for a few minutes just like before.

I've tried using WRF versions 4.5.2 and 4.3.1, but the issue persists. Are there any other solutions? Thank you!

 

[Ming Chen]

Can you clarify what is W2W?

Please send me your namelist.wps and namelist.input to take a look. Thanks.

 

[nanyin]

Thank you for your reply. W2W is a tool that combines LCZ maps with WPS processing. Detailed information about W2W is available on this website: Client Challenge.

 

[Ming Chen]

num_urban_nbui is a derived variable and you don't need to explicitly specify it.

Your case failed possibly due to other reasons. In your namelist.input. some options are not set cirrectly. Please change as follows:

cu_physics = 3, 0 , 0,

sf_urban_physics = 3, 3, 3,

Let me know whether you can run successfully. if not, please send me the error messages shown in your rsl files.

By the way, WPS provides LCZ data. I wonder why you created it using W2W, ---- this could be a potential issue, too.

 

[nanyin]

Thank you so much for your reply—your help means a lot to me! I tried your suggestions and successfully generated the output. However, there are a large number of "USING DEFAULT URBAN MORPHOLOGY" messages in the rsl.error file. At the end of the file, it shows "wrf: SUCCESS COMPLETE WRF", which seems to indicate that the urban module has not been loaded correctly.

I suspect the issue might be with the W2W tool I used. The reason I turned to W2W is that I don’t know how to load LCZ maps into WRF, and I haven’t been able to find a complete workflow for using LCZ maps. Currently, I’m using WPS 4.5 and WRF 4.5.2. I’ve seen some websites mention that operations like linking files and modifying configuration files are required, but I’m not sure where to start with these steps.

Could you please share a detailed, step-by-step workflow for loading LCZ maps into WRF? I would be extremely grateful for your guidance!