Which parameter should be adjusted when the simulated baseflow is much smaller than observations?

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Sep 29, 2025, 3:59:01 AM (9 days ago) Sep 29

to wrf-hydro_users

Hi all,

I am now using the pywrfhydrocalib package to calibrate the WRF-hydro model to improve its performance.

The BEXP, SMCMAX, DKSAT, REFKDT, MAnnN, and ovroughrtfac are listed in the calib_params.tbl.

The above parameters have an impact on peak flow. However, the simulated baseflow is always much smaller than the observations.

Is there anyone who can provide some suggestions on the parameters?

0001_calib_run_obj.png

0001_metric_calib_run.png

0001_hydrogr_log.png

0001_obj_vs_parameters_calib_run.png

0001_metric_calib_run_outlier.png

0001_obj_vs_parameters_calib_run_outlier.png

0001_parameters_calib_run_outlier.png

calib_parms.tbl

0001_calib_run_obj_outlier.png

0001_scatter.png

0001_parameters_calib_run.png

0001_hydrograph.png

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Sep 29, 2025, 10:10:05 AM (8 days ago) Sep 29

to wrf-hydro_users, li yuan

The problem has been solved by calibrating groundwater parameters, including zmax, expon, and Coeff.

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