HR: 0800h
AN: U41C-0629    [Abstracts]
TI: Modeling Runoff on the North Slope of Alaska Using the HBV Model
AU: * Youcha, E K
EM: fneky@uaf.edu
AF: University of Alaska Fairbanks Water and Environmental Research Center, PO Box 755860, Fairbanks, AK 99775, United States
AU: Trochim, E
EM: erin.trochim@gmail.com
AF: University of Alaska Fairbanks Water and Environmental Research Center, PO Box 755860, Fairbanks, AK 99775, United States
AU: Kane, D L
EM: ffdlk@uaf.edu
AF: University of Alaska Fairbanks Water and Environmental Research Center, PO Box 755860, Fairbanks, AK 99775, United States
AB: The Arctic fresh water hydrologic cycle is dominated by the melting of the seasonal snow cover and scattered precipitation events during the summer months. The HBV model has been applied in the Imnavait and Upper Kuparuk basins, located in the headwaters of the Kuparuk River on the North Slope, to examine runoff during spring and summer months. HBV is a semi-distributed conceptual model and was developed in 1975 by the Swedish Meteorological and Hydrological Institute. Simple data inputs and robust predictive capacity make HBV an attractive method for modeling discharge, particularly in basins with limited data. Current work has focused on calibrating the Imnaviat model with greater precision using historical meteorological and discharge data from 1988 to present. We are now developing new models for the larger Upper Kuparuk and Putuligayuk watersheds on the North Slope. Additional uses for the model include predicting discharge for ungaged North Slope basins east of the Kuparuk such as the Kadleroshilik and the Kavik. Parameter calibration initially begins with HBV-light, a scaled-down version of the model which is used to examine parameter sensitivity using a Monte Carlo procedure. Principle component analysis is then used to examine the interaction between the parameters and each year of the model run. An optimized set of parameters common to all calibrating years is developed and tested on additional data from gaged and ungaged basins. Existing research on ablation characteristics and precipitation correction is used to modify the associated parameters in HBV. Permafrost affects, such as the timing of active layer development, are integrated into the runoff response routine to produce a more accurate physical representation. Challenges associated with modeling larger watersheds include more spatially distributed processes and limited available data for model calibration.
DE: 0702 Permafrost (0475)
DE: 0740 Snowmelt
DE: 1847 Modeling
DE: 1860 Streamflow
SC: Union [U]
MN: 2007 Fall Meeting