GEOLOGIC AND GEOMORPHIC CHARACTERIZATION OF FROZEN DEBRIS LOBE CATCHMENTS ALONG THE DALTON HIGHWAY, SOUTHERN BROOKS RANGE, ALASKA
Preliminary results indicate that frozen debris lobes form in gullies, cored by less-competent material such as phyllite, slate, and chloritic schist and flanked by ridges of competent bedrock such as limestone, marble, metasandstone, and gneiss. Catchment areas are characterized by solifluction lobes, fractures, slumps, channels, standing water, permafrost, and minimal vegetative cover. Debris is contributed to the frozen debris lobes by a variety of slope processes, including solifluction, rockfall, slope failure, and runoff. Characterizing the geologic attributes of the overall catchment area is an important component to understanding the hazard potential of the frozen debris lobes. Our observations and results will provide new information useful for maintenance of current infrastructure and planning for future development in the corridor.