HR: 0800h
AN: H21A-0199    [Abstracts]
TI: Integrating Thermokarst Features in the UpperKuparuk and Imnvait Basin Using Remote Sensing and Ground-Truth Data into TOPOFLOW
AU: * Trochim, E D
EM: ftedt@uaf.edu
AF: University of Alaska Fairbanks, P.O. Box 755910, Fairbanks, AK 99775, United States
AU: Kane, D L
EM: ffdlk@uaf.edu
AF: University of Alaska Fairbanks, P.O. Box 755910, Fairbanks, AK 99775, United States
AB: Surface runoff fluxe in the Arctic fresh water hydrological cycle can be modified by the presence of thermokarst; the visible surficial manifestation of permfrost degradation including ground subsidence, thermokarst ponds, beaded streams and appearance of water tracks. Predicting and characterizing potential hydrological response is an important component for engineering infrastructure appropriate for the climatic conditions. The Upper Kuparuk and Imnavait basins north of the Brooks Range in Alaska are part of a long-term monitoring effort, and provide an opportunity to pair hydrological studies and high-resolution topography models with remotely sensed data, to create a quality spatial distributed perspective. Imagery from EO-1's Advanced Land Imager (ALI) captured in August 2004 was used to contrast techniques for identifying and quantifying thermokarst features. Principle component analysis and a MNF transformation using a combination of existing, field and lab-derived spectra of vegetation and land-cover were used to classify water tracks, and compared to ground based surveys from 2007. Thermokarst ponds and the beaded stream formation were quantified using airphotos taken in 2004 and 2007. A geospatial database was constructed to examine the relationships between the imagery, existing digital elevation model and field data collected in 2007. The spatial extent of the thermokarst features and associated characteristics will be merged into the processed-based, spatially-distributed hydrological model TopoFlow, based upon the joining of ARHYTHM (ARctic HYdrologic and THermal Model), and a D8-based rainfall- runoff model.
DE: 1819 Geographic Information Systems (GIS)
DE: 1823 Frozen ground
DE: 1847 Modeling
DE: 1855 Remote sensing (1640)
SC: Hydrology [H]
MN: 2007 Fall Meeting