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<br />PSOO-6 <br /> <br />Donald E. Guy, Ir <br />Ohio Geological Survey e <br />Lake Erie Geology Group <br />1634 Sycamore Line <br />Sandusky, Ohio 44870-4132 <br />419-626-4296 <br />don,guy@dnr.state.oh.us <br /> <br />TEMPORAL AND SPATIAL VARIATIONS IN EROSION <br />ALONG THE OHIO SHORE OF LAKE ERIE <br /> <br />As part of a FEMA-funded study of erosion in Lake County, bluff recession between 1938 <br />and 1996 was mapped from aerial photography along 49.4 km oflakeshore. Recession was measured <br />at 30-m intervals, These data, combined with data for five other periods, show temporal and spatial <br />variations in erosion in Lake County spanning time intervals of 17 to 114 years in length. Mean rates <br />range from 0.46 to 0.50 rnIyr, maximum rates range from 1,68 to 3.73 rnIyr, and standard deviation <br />in rates ranges from 0.37 to 0,73 rnIyr. Maximum rates and highest standard deviation in rates occur <br />in the 1937-1973 and 1973-1990 periods. The ratio of maximum rate to minimum rate ranges from <br />1.68 to 3.72 in the 1876-1937 and 1973-1990 periods, respectively. Alongshore maxima in recession <br />occur at 1,61- to :3 .22-km intervals. <br /> <br />e <br /> <br />Data from this study are compared to data from a 1,3-km reach at Painesville on-the-Lake, <br />Lake County, At Painesville on-the-Lake, data were collected for six sequential periods, 3 to 61 <br />years in length, using aerial photography, and for 4 sequential periods, 1 to 3 years in length, using <br />topographic surveys of the bluff line and bluff toe. These data illustrate short term temporal and <br />spatial variations in recession that are masked by rates determined over longer time intervals, <br /> <br />e <br /> <br />,...-, <br />