Kinematic wave (sub timestep) - Running the kinematic wave (overland flow and river flow) at sub-timestep (iterations) resulted in a too smoothed/delayed discharge pattern. - Now states at sub-timestep are used for wflow_hbv and wflow_sbm. This improves the discharge pattern. - Note 1: this change affects the simulated discharge (timing and peaks) quite a bit (compared to previous code versions). - Note 2: state files have also changed, recommmend to start with cold state start (reinit=1)
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