Pilot Study Program, Great Lakes Shoreland Damage Study. Appendix VII. Measurement of Coastal Bluff Erosion from Aerial Photographs, Muskegon, County, Michigan.

摘要

This appendix evaluates the usefulness of aerial photographs in the determination of coastal erosion rates. The effectiveness of aerial photographs was examined in terms of availability, type of coverage, and the reliability of the measurements obtained form the photographs. This report clearly indicates that recession rates cannot be quantified to the desired degree. Only ball park values of rates can be obtained under two possible situations using the methods out-lined in this paper: (1) When a great deal of erosion occurs over a short period of time; or (2) When measurements are made over a long time interval. Indication of rapid recession over a short time interval can usually be detected by simple observation of the aerial photographs.