. Coastal changes, eastern Lake Michigan, 1970-1974. Coast changes. 8 May 1973 - View to north; note lack of beach, steep 17 July 1974 - View north showing seawall. Note gray clay till outcrop in center of photo. Profile Line 10. The box-type seawalls with permeable sides, located both north and south of this profile line, are evidence of a history of erosion. Severe erosion of 10 meters during the fall of 1970 and 1971 uncovered a bed of clay till below the sand bluff. This tended to stabilize the bluff through 1972 and 1973. However, the near-vertical face of the till layer began to
. Coastal changes, eastern Lake Michigan, 1970-1974. Coast changes. 8 May 1973 - View to north; note lack of beach, steep 17 July 1974 - View north showing seawall. Note gray clay till outcrop in center of photo. Profile Line 10. The box-type seawalls with permeable sides, located both north and south of this profile line, are evidence of a history of erosion. Severe erosion of 10 meters during the fall of 1970 and 1971 uncovered a bed of clay till below the sand bluff. This tended to stabilize the bluff through 1972 and 1973. However, the near-vertical face of the till layer began to erode during 1974. The absence of any significant beach undoubtedly contrib- uted to the erosion. 75. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Birkemeier, William A. (William Allen), 1951-; Coastal Engineering Research Center (U. S. ). Fort Belvoir, Va. : U. S. Army, Corps of Engineers, Coastal Engineering Research Center ; Springfield, Va. : National Technical Information Service, Operations Division [distributor]
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