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U.S. Geological Survey Open-File Report 2009-1042

National Assessment of Historical Shoreline Change: A Pilot Study of Historical Coastal Bluff Retreat in the Great Lakes, Erie, Pennsylvania

Return to: Abstract » Introduction » Prior Assessments » Geology, Physiography, and Recession » Methodology » Bluff-Retreat Rates » Conclusion » Acknowledgments » References Cited
Figure 1. (A) This low-angle oblique aerial photograph shows an area of high recession along Lake Erie, Pennsylvania, bluffs that is not documented in a State Coastal Resources Management Program monitoring study as a result of the original location of the control point from which distance to the bluff edge is measured. (B) This low-altitude vertical aerial photograph of the same area shows the location of the control point (blue dot) and the azimuth (blue arrow) along which the transects are measured. Photographs from Pennsylvania Coastal Resource Management Program.
Figure 1. (A) This low-angle oblique aerial photograph shows an area of high recession along Lake Erie, Pennsylvania, bluffs that is not documented in a State Coastal Resources Management Program monitoring study as a result of the original location of the control point from which distance to the bluff edge is measured. (B) This low-altitude vertical aerial photograph of the same area shows the location of the control point (blue dot) and the azimuth (blue arrow) along which the transects are measured. Photographs from Pennsylvania Coastal Resource Management Program.

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