Sub-grid snow variability in stream flow modelling of an Alpine catchment Online publication date: Tue, 03-Oct-2017
by Shailesh Kumar Singh
International Journal of Hydrology Science and Technology (IJHST), Vol. 7, No. 3, 2017
Abstract: The spatial variability of snow within a catchment can have a great influence on hydrological response of the catchment. Accounting sub-grid variability within hydrological models will improve simulations. This paper investigates the effect of sub-grid snow variability parameterisation on stream flow modelling in an alpine catchment. The TopNet hydrological model was applied to a catchment in the Southern Alps, New Zealand. The model was calibrated for range of sub-grid snow variability parameters. The parameter value that resulted in the best calibration was compared to physically derived values. The full range of sub-grid snow variability values tested led to log-Nash Sutcliffe values ranging 0.66-0.74, indicating that the model is relatively sensitive to the sub-grid snow variability. The sub-grid snow variability parameter that led to the best calibrated model agreed well with observations. This result indicates that inclusion of the parameter improves the physical realisation of the model for steep alpine catchments.
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