REGIONALIZATION OF UNIT-HYDROGRAPH PARAMETERS .2. UNCERTAINTY ANALYSIS

Hydrologic model parameters obtained from regional regression equation s are subject to uncertainty. Consequently, hydrologic model outputs b ased on the stochastic parameters are random. This paper presents a sy stematic analysis of uncertainty associated with the two parameters, N and K, in Nash's IUH model from different regional regression equatio ns. The uncertainty features associated with N and K are further incor porated to assess the uncertainty of the resulting IUH. Numerical resu lts indicate that uncertainty of N and K from the regional regression equations are too significant to be ignored.