Re: [wrf-hydro_users] Digest for wrf-hydro_users@ucar.edu - 2 updates in 2 topics

[Yongxin Zhang]

Hi Fructueux Ehouinsou,

     I can help you with creating the LDASIN forcing files for your domain using IMERG (as supplemental precipitation files) and ERA5-Land (as meteorological forcing files). I can download sample IMERG data and ERA5-Land data but in order to make sure that I develop the right scripts for your case I am wondering if you could send me one day or a few day's IMERG and ERA5-Land data files that you use? You will need to send me the geo_em file for your domain as well.

Thanks,

Yongxin

On Thu, Nov 20, 2025 at 4:13 AM <wrf-hyd...@ucar.edu> wrote:

wrf-hyd...@ucar.edu

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• Support Request about LDASIN & NUDGING for WRF-Hydro STANDALONE - 1 Update
• Request for Access to WRF-Hydro/Glacier Coupled Model Source Code - 1 Update

Support Request about LDASIN & NUDGING for WRF-Hydro STANDALONE

Fructueux EHOUINSOU <ehouinsou...@gmail.com>: Nov 19 06:54PM +0100 My name is *Fructueux Ehouinsou*, I am a Master’s student working on land–surface and hydrological modeling, and as part of my research work, I am implementing WRF-Hydro (standalone) over my study basin. I am reaching out for support regarding two important components of my WRF-Hydro standalone setup using the Noah LSM.   *1. Generation of LDASIN Atmospheric Forcing Files*   I am currently building LDASIN forcings from:   - *IMERG* (30-min precipitation) - *ERA5-Land* (hourly meteorological variables)   However, I am facing challenges with:   - correctly reprojecting IMERG/ERA5-Land to my model grid (projection from wrfinput_d01, Mercator) - ensuring full CF compliance (grid_mapping, scale_factor, esri_pe_string, etc.) - constructing fully valid LDASIN files (variable types/units, time & reference_time dimensions, RAINRATE generation)   I would appreciate guidance on: → recommended scripts, workflows, or examples for producing LDASIN forcings from IMERG + ERA5-Land datasets or other multiple data sources.   *2. Configuration of Hydrologic Nudging*   I also plan to activate discharge nudging for automatic calibration, but I am unsure how to:   - correctly build the *nudgingParams.nc* file for my domain - generate the required NetCDF *time-slice observation files* from *daily discharge data* - handle the temporal mismatch (daily observations → hourly model timestep) - map streamflow gauge stations to the correct *LINKID* entries in RouteLink.nc   Any working examples (nudgingParams.nc, time-slice files, recommended workflow) would be extremely helpful.   Thank you very much for your support. I can provide any required files (wrfinput, geo_em.dxx , RouteLink, generated LDASIN, etc.) if needed.   Kind regards,

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Request for Access to WRF-Hydro/Glacier Coupled Model Source Code

Sabina Twayana <sabinat...@gmail.com>: Nov 19 08:10PM +0545 Dear Arezoo,   Thank you so much for sharing link.   With regards, Sabina Twayana Master's in Environmental Science specialization in Glaciology Kathmandu University Contact No:- 9863474824 Linkedin <https://www.linkedin.com/in/sabina-twayana-623443234/>

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[Fructueux EHOUINSOU]

Hello Yongxin Zhang,

Thank you very much for your willingness to help.

As requested, I am sharing the data files upon 2 days I am currently using for my WRF-Hydro standalone setup:

• IMERG precipitation data → global coverage, downloaded at 30-min resolution.

• ERA5-Land meteorological data → downloaded monthly, with hourly temporal resolution.

• geo_em.d01.nc → the geogrid file for my domain.

• wrfinput_d01 → the initialization file used for Noah LSM.

https://drive.google.com/file/d/1NnsBDdfpNvUKsyyLE9oAKOoiFwpg6fQF/view?usp=sharing

Please let me know if you need more details about my processing workflow.

Thanks again for your support.

Best regards,

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