ASSESSING THE PARAMETERS OF THE HYDROLOGICAL HBV MODEL USING FIELD OBSERVATION DATA ON EXPERIMENTAL CATCHMENTS (SOUTH OF PRIMORSKII KRAI)
S.Yu. Lupakov, A.N. Bugaets, V.V. Shamov
Pacific Geographical Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia
Keywords: HBV model, calibration, parameter robustness, experimental catchments
Abstract
An analysis of the HBV hydrological model parameters values and a comparison of the modelling efficiency have been made for small experimental mountain catchments located in the upper reaches of the Ussuri river (Primorskii krai, Russia). For each catchment the model was calibrated for individual years and, after that, for the entire observing period. The sets of parameters obtained were used in calculations based on independent data for periods not included in the interval of parameters optimization. A calibration of the model showed that an optimal set of the parameters values for one year can differ greatly from the parameters for another year within a single catchment. Appropriate values of the modeling efficiency for the entire observations period are provided with using sets of parameters calibrated for seasons with high floods caused by heavy rainfall. The periods of low and medium water flow are characterized by relatively high errors in calculating the water runoff, which decreases the overall efficiency and reliability of results in modeling the entire period of data availability. It is shown that for the simulation of a high runoff by the HBV model, it is sufficient to have two or three years of instrumental observations including measurements of one or two significant flood events. A formal transfer of model parameters from one small catchment to nearby similar objects is only possible for assessments of rainfall floods characteristics. In other cases, such an approach leads to an inappropriate structure of the model water balance components and causes errors in runoff calculations.
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