Streamflow Underestimation in Coupled WRF-Hydro Simulation

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PREETI JAKHWAL

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6:53 AM (7 hours ago) 6:53 AM

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Dear WRF-Hydro Users Group,

I am running a coupled simulation using WRF-Hydro with WRF in online mode and observing significantly low streamflow values in the output. The model executes successfully, but the simulated discharge is on the order of 1–2 m³/s, whereas expected values for the basin are approximately 100–200 m³/s.

The current setup includes: Simulation period: August 6 to August 27, Domain: d03, 1 km land surface resolution (WRF),100 m routing resolution (DXRT = 100 m, AGGFACTRT = 10),Forcing from NCEP FNL (0.25°), Channel routing using diffusive wave option (channel_option = 3), A drainage network consisting of ~1000 channel cells, Standard Noah-MP land surface configuration, Streamflow is extracted from CHRTOUT outputs (gridded channel flow).

I would appreciate any insights into potential causes of such low streamflow estimates, particularly with respect to routing configuration, scale mismatch between atmospheric forcing and hydrological resolution, or channel network representation.

Thank you for your time and support.

Best regards,
Preeti Jakhwal

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