TY  - JOUR
A1  - He, Zhihua
A1  - Vorogushyn, Sergiy
A1  - Unger-Shayesteh, Katy
A1  - Gafurov, Abror
A1  - Kalashnikova, Olga
A1  - Omorova, Elvira
A1  - Merz, Bruno
T1  - The Value of Hydrograph Partitioning Curves for Calibrating Hydrological Models in Glacierized Basins
JF  - Water resources research
N2  - This study refines the method for calibrating a glacio-hydrological model based on Hydrograph Partitioning Curves (HPCs), and evaluates its value in comparison to multidata set optimization approaches which use glacier mass balance, satellite snow cover images, and discharge. The HPCs are extracted from the observed flow hydrograph using catchment precipitation and temperature gradients. They indicate the periods when the various runoff processes, such as glacier melt or snow melt, dominate the basin hydrograph. The annual cumulative curve of the difference between average daily temperature and melt threshold temperature over the basin, as well as the annual cumulative curve of average daily snowfall on the glacierized areas are used to identify the starting and end dates of snow and glacier ablation periods. Model parameters characterizing different runoff processes are calibrated on different HPCs in a stepwise and iterative way. Results show that the HPC-based method (1) delivers model-internal consistency comparably to the tri-data set calibration method; (2) improves the stability of calibrated parameter values across various calibration periods; and (3) estimates the contributions of runoff components similarly to the tri-data set calibration method. Our findings indicate the potential of the HPC-based approach as an alternative for hydrological model calibration in glacierized basins where other calibration data sets than discharge are often not available or very costly to obtain.
KW  - hydrograph partitioning curves
KW  - model calibration
KW  - glacierized basins
Y1  - 2018
U6  - https://doi.org/10.1002/2017WR021966
SN  - 0043-1397
SN  - 1944-7973
VL  - 54
IS  - 3
SP  - 2336
EP  - 2361
PB  - American Geophysical Union
CY  - Washington
ER  -