Ascertaining evapotranspiration series by the optimized rainfall-runoff model

Considerable long-term time series of precipitations and air temperature changes were used for modelling the rainfall-runoff process. The time series were also used for the accurate assessment of the evapotranspiration demand of the Czech Elbe River. Random fluctuations of vegetation cover are taken as an indication of deviations in the evapotranspiration. The intention is to appraise such complicated time series as a long-term process. The recently modified software of the conceptual SAC-SMA model firstly enables a prompt simulation and secondly creates the conditions for automatic calibration of this model. This tool provides a separate simulation for each partial time interval with diverse expected values of evapotranspiration. This may be ascertained during the consecutive identification of optimal model parameters. The resulting evapotranspiration values are represented as outputs of modelling; these output values would be difficult to obtain from meteo-observations, e.g. measured data or computed values.