. Beach profile changes - east coast of Lake Michigan, 1970-72. Beach erosion; Coast changes. 5. Longshore Bars. The significant variables may be the number, position, and geometry of longshore sandbars. These sandbars may be important in limiting the amount of wave energy reaching the beach by causing waves to break farther offshore, or by affecting the refracted direction of the waves near shore. However, longshore sandbars may explain some of the apparent randomness in time and location of bluff recession. Vlll. VOLUME, WIDTH, AND SLOPE DATA 1. Estimated Volumes of Erosion. The volume of ma
. Beach profile changes - east coast of Lake Michigan, 1970-72. Beach erosion; Coast changes. 5. Longshore Bars. The significant variables may be the number, position, and geometry of longshore sandbars. These sandbars may be important in limiting the amount of wave energy reaching the beach by causing waves to break farther offshore, or by affecting the refracted direction of the waves near shore. However, longshore sandbars may explain some of the apparent randomness in time and location of bluff recession. Vlll. VOLUME, WIDTH, AND SLOPE DATA 1. Estimated Volumes of Erosion. The volume of material removed from the dunes or bluffs was estimated during each year of the 2-year study. These values were computed by over- laying the first and last surveys for a study year, locating the inter- section of the beach with the bluff on the first survey, dropping a vertical line from that intersection to the profile of the last survey, and then calculating the volume eroded landward of that vertical line. The resulting volume is shown two-dimensionally in Figure 25. The composition of the bluff (sand or till) and the volume eroded for each year are shown in Table 6. The pattern of erosion is presented in Section V, Profile Descriptions; volumes calculated range from 0 to cubic yards per foot of beach front per year. Data on the size distribution of eroded material were not collected. Volume Calculated. Profile site 3 First Survey Last Survey Figure 25. Example of eroded volume computation. 52. 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 Davis, Richard A. (Richard Albert), 1937-; Fingleton, W. G; Pritchett, P. C; Coastal Engineering Research Center (U. S. ); Western Michigan University. Ft. Belvoir, Va. : U. S. Dept. of Defense, Dept. of the Army, Corps of Engineers, Coastal Engineering Research Ce
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