24 resultados para Lake Shore

em University of Michigan


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The Chicago River/Lake Shore area assessment, part of a series of statewide regional assessments, examines approximately 348 square miles in northeastern Illinois that falls within portions of two counties-- Cook and Lake. The area is defined by the watershed of the Chicago River and the areas of Cook and Lake counties that drain to Lake Michigan, excluding the area in southern Cook County that drains to the Calumet River. The report provides information on the natural and human resources of the area as a basis for managing and improving its ecosystems. The development of ecosystem-based information and management programs in Illinois are the result of three processes-- the Critical Trends Assessment Program, Conservation Congress, and Water Resources and Land Use Priorities Task Force.

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Red, blue, black in on linen; plan, cross-section; signed; 53 x 47 cm; Scale: 1" = 1' [from photographic copy by Lance Burgharrdt]

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Mode of access: Internet.

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At head of title: Dept. of the interior.

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Shorelines tend to retreat landward as water levels rise. Less than 20 percent of the shore, lost as Lake Michigan rose between 1967 and 1976, was due to direct inundation; the remaining 80 percent was due to increased erosion in response to the higher lake levels. A simple correlation of lake level change and simultaneous shore retreat ignores the inevitable lag between process and response, but still accounts for 50 percent of the variance in shore retreat. A graphic summary of field data is presented to estimate effects of future lake level changes in similar coastal environments. Qualitative guidance is provided on how and when these estimates should be adjusted to reflect differences in environmental settings. Complete adjustment of the shore will be underestimated by the empirical relationship; but where lake levels change constantly, there will be many such instances of incomplete shore response. (Author).

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Description based on: 1971.