sediment yield sensitivity analysis

[Vouchlay Theng]

Hello,

After calibrating hydrology parameters, I start doing sensitivity analysis of sediment yield. I don't know I should keep calibrated parameters of hydrology or I should delete it from the Parameters of the model. When I deleted hydrological parameters and I re-ran the flow, I noticed model performance of hydrology was not the same as what I have calibrated. However, when I kept calibrated parameters of hydrology and ran sensitivity analysis of sediment yield, I noticed all parameter values (hydrology+sediment parameters) were changed. May you guide me please? 

Many thanks