. The effect of structures and lake level on bluff and shore erosion in Berrien County, Michigan, 1970-74. Offshore structures; Beach erosion. This study covers the final 3 years of a steady 9-year period of increas- ing lake level from an annual mean of meters. International Great Lakes Datum (IGLD), in 1964 to meters in 1973. During 1974, the final year of study, the lake stabilized at a level just slightly less than the 1973 level. The variation in lake level from 1951 to 1974 as recorded by the National Oceanic and Atmospheric Administration (NOAA) (1971; 1972; 1973; 1974; 19
. The effect of structures and lake level on bluff and shore erosion in Berrien County, Michigan, 1970-74. Offshore structures; Beach erosion. This study covers the final 3 years of a steady 9-year period of increas- ing lake level from an annual mean of meters. International Great Lakes Datum (IGLD), in 1964 to meters in 1973. During 1974, the final year of study, the lake stabilized at a level just slightly less than the 1973 level. The variation in lake level from 1951 to 1974 as recorded by the National Oceanic and Atmospheric Administration (NOAA) (1971; 1972; 1973; 1974; 1975) is shown in Figure 1950 I I t I I I I 578 r I960 1965 Yeor 1970 Figure 2. Annual average of Lake Michigan water level as recorded at Ludington, Michigan, from 1951 to 1974 (IGLD). Figure 3 shows the mean monthly lake level from 1970 to 1974 and the maxi- mum and minimum mean daily water levels for each month. The average seasonal lake level variation from lows in the beginning of the year to highs in summer is meter which equals the long-term average given by Seibel (1972). A major increase in the average lake level occurred in 1972 when there was little seasonal decrease in lake level following the summer 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. : Available from National Technical Information Service
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