Seeking Help with Nudging Experiment Issue

[zed li]

Hello everyone,

I am encountering an issue with my nudging experiment in my study area and would appreciate your insights. I have observation data from three stations for assimilation. When I use all three stations for nudging, the results are excellent—the simulated discharge closely matches the observed discharge at all three stations.

However, when I exclude one upstream station (by adding an "X" before its station ID in the nudgingTimeSliceObs file), the simulated discharge at that station drops to less than 10 m³/s. Similarly, when I exclude all three stations, the simulated discharge at all three stations falls below 10 m³/s. This is abnormal because, when I run the simulation with the executable configured as WRF_HYDRO_NUDGING=0 and UDMP=0, the peak discharge at all three stations exceeds 3000 m³/s.

I have carefully checked the polyid variable in the spatialweights.nc file and confirmed that it corresponds to the ComID variable in GWBUCKPARM.nc and the link variable in Route_Link.nc. Despite this, I am unable to identify the source of the problem.

I have packaged all the relevant files and would be grateful if you could try running the experiment to help pinpoint the issue. Please let me know if you need any additional information or details.

https://drive.google.com/file/d/16qHgsIMX35TlqEE8zRGL7yirYMsavCto/view?usp=drive_link

Thank you in advance for your time and assistance!

Best regards,

Zed Li