Question about function of URBPARAM.TBL, URBPARAM_LCZ.TBL, and URBPARAM_UZE.TBL

[a8626086s]

I’m simulating the urban heat island with WRF 4.4.1 and have encountered problems about different URBPARAM*.TBL files used in UCM. I’d appreciate any clarification on in what cases will each of these files takes effect.
I understand that the sf_urban_physics in namelist.input controls whether UCM is activated, and the URBPARAM*.TBL files provide necessary parameter for UCM. Based on my current understanding, I believe the usage is as follows, but I’m not completely sure:

1. When use_wudapt_lcz = 0, the model uses URBPARAM.TBL for UCM parameters.
2. When use_wudapt_lcz = 1, the model instead uses URBPARAM_LCZ.TBL, and URBPARAM.TBL is ignored.

Is this understanding correct? I’m also unsure about the role of URBPARAM_UZE.TBL. Under what conditions does this file take effect? Moreover, is there any cases in which more than one URBPARAM*TBL files take effects?
Thanks you!

 

[a8626086s]

One more question about setting land use class.
According to post-31751(How to modify URBPARAM.TBL parameters for 1 urban class), I can run WRF-UCM with only one urban class and can modify parameters for this class. Does this mean that if I want to run UCM, I should reclassify the original single urban class as 31 (or 32, 33), set isurban as 31 (or 32 33) GEOG INDEX file and change num_class in namelist.input as 41, rather than remaining the urban class as the original one (such as 13 in MODIS LUCC) and keep INDEX file and num_class unchanged?

 

[Ming Chen]

Please see my answers below:

I’m simulating the urban heat island with WRF 4.4.1 and have encountered problems about different URBPARAM*.TBL files used in UCM. I’d appreciate any clarification on in what cases will each of these files takes effect.
I understand that the sf_urban_physics in namelist.input controls whether UCM is activated, and the URBPARAM*.TBL files provide necessary parameter for UCM. Based on my current understanding, I believe the usage is as follows, but I’m not completely sure:

1. When use_wudapt_lcz = 0, the model uses URBPARAM.TBL for UCM parameters.
2. When use_wudapt_lcz = 1, the model instead uses URBPARAM_LCZ.TBL, and URBPARAM.TBL is ignored.

This is correct.

Is this understanding correct? I’m also unsure about the role of URBPARAM_UZE.TBL. Under what conditions does this file take effect? Moreover, is there any cases in which more than one URBPARAM*TBL files take effects?

Thanks you!

URBPARAM_UZE.TBL is not used in WRF.

 

[Ming Chen]

If I understand your question correctly, you don't need to reclassify urban types to 31, 32, 33. The original urban land use type (i.e., 13 in Modis) should work.

One more question about setting land use class.
According to post-31751(How to modify URBPARAM.TBL parameters for 1 urban class), I can run WRF-UCM with only one urban class and can modify parameters for this class. Does this mean that if I want to run UCM, I should reclassify the original single urban class as 31 (or 32, 33), set isurban as 31 (or 32 33) GEOG INDEX file and change num_class in namelist.input as 41, rather than remaining the urban class as the original one (such as 13 in MODIS LUCC) and keep INDEX file and num_class unchanged?

 

[a8626086s]

If I understand your question correctly, you don't need to reclassify urban types to 31, 32, 33. The original urban land use type (i.e., 13 in Modis) should work.

Thank you very much, all my questions have been answered