Regarding wrfinput file preparation

[Aarti Soni]

Hi,

As I am new to this wrf-hydro model, I have some queries regarding wrfinput file preparation. I am running the model with GLDAS and GFS input data sets. 

The document states that we can use real.exe or R script to create wrfinput.nc file but it requires only a geogrid domain file. For a realistic case, we need to go through ungrib, metgrid etc, right? Then how R script-generated file and real.exe generated wrfinput file can be the same?

Can anyone clarify this?

Thank you.

[aubrey]

Hi Aarti:

If you want "realistic" initial conditions, you can use the real.exe utility with reanalysis data to get starting states for the model. Most of the time for hydrologic models we run an extensive spinup before evaluating model outputs to let soil moisture, groundwater, etc. stabilize, so the initial conditions matter less. The create_wrfinput R (and now python - see https://ral.ucar.edu/projects/wrf_hydro/pre-processing-tools) scripts will take the geogrid file, copy over the needed static variables (e.g., soil type, veg type), then put in global values for the initial conditions for states like snowpack and soil moisture. This is OK if you plan to run a spinup, but if you do not plan to run an extensive spinup then you might want to go through the extra effort of running real.exe.

Hope that helps.

Aubrey

[Aarti Soni]

Thanks,  Aubrey for clarification.

I have one more query, I have prepared 3-hourly GLDAS data for 22 years at 5km. Is it ok if I run the model in one single run in HPC? 

[Jana Corominas]

Hello everyone,

I read you are using GFS as input data for WRF-Hydro simulation. Are you using GFS2WRFHydro regridding tool from NCAR to achieve this? 

GFS contains accumulated precipitation and I want to know if the regridding tool manages this properly or changes should be made. 

Also I want to run a long simulation merging 1-hourly and 3-hourly GFS, have any of you faced this issue? I want to find the easiest way to interpolate GFS data to forecast hourly streamflow.

Thanks a lot.

[aubrey]

Hi Aarti:

I'm not sure I can answer this question - this is dependent on your HPC configuration and resources.

Note that some of the output variables are accumulations, so the numbers will get quite large over a longer run without any resets.

Thanks!

Aubrey