Kecheng Zhao
New member
Hello,
I encountered the following issues while using WRF-UCM:
I am using MODIS 21-class land use data. After running geogrid, I used my own Python code to replace urban category 13 with 31 (low-density residential), 32 (high-density residential), and 33 (commercial) based on population density. The met_em files generated after running metgrid also show LU_INDEX as 31, 32, and 33.
However, after running real, I found that the LU_INDEX in the wrfinput files reverted to 13. In my namelist settings, I set num_land_cat = 21, and during the WRF run, I noticed the message "USING DEFAULT URBAN MORPHOLOGY" in the logs, so I’m unsure if it used my URBAPARM.TBL settings.
Therefore, I have a few questions and would appreciate your help:
# The default values are probably not appropriate for any given city.
# Users should adapt these values based on the city they are working
# with.
# Urban Parameters depending on Urban type
# USGS
Number of urban categories: 3
#
# Where there are multiple columns of values, the values refer, in
# order, to: 1) Low density residential, 2) High density residential,
# and 3) Commercial: I.e.:
#
# Index: 1 2 3
# Type: Low-dens Res, Hi-dens Res, Commercial
#
How can I ensure that the low-density residential, high-density residential, and commercial areas use the corresponding settings in URBAPARM.TBL? Or does WRF automatically recognize 31, 32, and 33?
Thank you for your help!
I encountered the following issues while using WRF-UCM:
I am using MODIS 21-class land use data. After running geogrid, I used my own Python code to replace urban category 13 with 31 (low-density residential), 32 (high-density residential), and 33 (commercial) based on population density. The met_em files generated after running metgrid also show LU_INDEX as 31, 32, and 33.
However, after running real, I found that the LU_INDEX in the wrfinput files reverted to 13. In my namelist settings, I set num_land_cat = 21, and during the WRF run, I noticed the message "USING DEFAULT URBAN MORPHOLOGY" in the logs, so I’m unsure if it used my URBAPARM.TBL settings.
Therefore, I have a few questions and would appreciate your help:
- Is my approach to modifying land use categories incorrect? How should I properly replace urban categories with 31, 32, and 33? Do I need to modify files like LANDUSE.TBL?
- The beginning of URBAPARM.TBL is as follows:
# The default values are probably not appropriate for any given city.
# Users should adapt these values based on the city they are working
# with.
# Urban Parameters depending on Urban type
# USGS
Number of urban categories: 3
#
# Where there are multiple columns of values, the values refer, in
# order, to: 1) Low density residential, 2) High density residential,
# and 3) Commercial: I.e.:
#
# Index: 1 2 3
# Type: Low-dens Res, Hi-dens Res, Commercial
#
How can I ensure that the low-density residential, high-density residential, and commercial areas use the corresponding settings in URBAPARM.TBL? Or does WRF automatically recognize 31, 32, and 33?
Thank you for your help!