EVALUATION OF SURFACE CHANGE ON FROZEN DEBRIS LOBES - DALTON HIGHWAY, SOUTHERN BROOKS RANGE, ALASKA
We are currently processing and analyzing overlapping, very high resolution, near-vertical aerial photographs collected for several FDLs in June and August 2013 and 2014 in order to: 1) quantify surface change over time; 2) better understand the overall character of the flows and their source basins; and 3) develop a geohazards classification that will be useful for planners and engineers to evaluate and mitigate potential impacts of these features. We will present results from this work and discuss ongoing field investigations, including measurement of surface movement and evaluation of the geologic characteristics of the FDLs and their source basins, and highlight our study of the spatial variability of lobe surface movement. Surface morphologies and field measurements indicate variable movement rates on FDLs, which we can identify and quantify using the new high-resolution aerial photography. Based on our initial comparison of photographs taken in June and August, 2014, we are able to identify areas of significantly increased material mobilization, likely in response to the wet summer season.