3.1 Sensitivity analysis

With the fast development of hydrological model，the model complexityhas been increased.Compared to conceptual lumped model，distributed hydrological model requires higher computational capability.Meanwhile，over parameterization (Beven，1989)，hyper nonlinear parameter space can causeequilibrium and uncertainty (Carpenter，2001).For many distributed hydrological model，parameters may exceeded over hundreds due to large amounts ofcomputational units and state variables.Sometimes，the observation of physical based parameter is difficult.This leads to a problem of hydrological modeloptimization under hyper parameter space.Some hydrological model parametersmight not be sensitive to a certain criterion.Therefore，by carrying out sensitivity analysis，SA before optimization is feasib ......     （共3890字）    [阅读本文]>>