A NEW METHOD FOR EXTRACTING RIVER PROFILES AND NORMALIZED STEEPNESS VALUES WITH OPEN SOURCE R SCRIPT
With high-resolution LIDAR data (horizontal resolution of ~6 m and a vertical resolution of ~1/3 m) obtained from the NC Floodmaps program (http://www.ncfloodmaps.com/) a discretized slope map was produced using three topographic parameters. The first parameter was defined as areas with both elevations less than 1000 m and slopes less than 3 degrees. These areas correspond to possible lineaments. The second topographic style was defined as areas with elevations greater than 1000 m and slopes less than 10 degrees, and was used to find possible relict landscapes in the upper reaches of drainage basins. The third topographic style was defined as areas higher than 1000 m with slopes greater than 10 degrees. These areas correspond to high topography that is steep.
To establish a relative sequence of local uplift, a geomorphological study of knickpoint migration may be utilized (Gallen et al., 2011, Gallen et al., 2013, Miller et al, 2013). The addition of the discretized slope maps offers a new way to find relict landscapes and compare these with knickpoint locations.