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First Author:Evan Lewis, Franklin and Marshall College, Lancaster,PA United States
Presenter:
Evan Lewis, Franklin and Marshall College, Lancaster,PA United States
Abstract ID:
466110
Abstract Body:
Rapid advances with airborne lidar and drone technology, including Structure from Motion, make it possible to identify the best sites for restoration and to quantify the potential load reductions more accurately. In south-central PA, we use lidar dem differencing from 2006 to 2014 to calculate erosion rates along all streams and identify reaches with the highest rates of erosion. These streams are heavily impacted by historic mill damming and store an abundance of legacy sediment. Along one of these streams, Indian Run, we calculate 0.2-0.3 m^3 of erosion per m of stream length per year, a relatively high rate for this region. We are refining this estimate with analysis of volumetric change between 2018 (drone photogrammetry) and 2014 (airborne lidar) with the goal of increasing the resolution of our results, reducing volumetric error, and understanding the abilities and limitations of photogrammetry. Supplementing traditional methods with higher fidelity datasets is crucial to how we quantify erosion of legacy sediment. Our preliminary results suggest that using drone based photogrammetry could reduce the uncertainty of our results by an order of magnitude.
Proposed Session:
H081
Proposed Session Title:
Legacy Effects of Land Use on Water Quality, Watershed Processes, and Ecosystem Function: Implications for Science and Policy
Proposed Section/Focus Group:
Hydrology