EXERCISE 19 D Section Shore Erosion and Levels of Lake Michigan 1. The recoed of

Question

EXERCISE 19 D Section Shore Erosion and Levels of Lake Michigan 1. The recoed of levels for Lake Michigan (ig. 4.60) hows highs and lows over a period of 62 years. Does this record suggest that the fluctuations of the lake levels follow a regular periodicity that would permit the forecasting of future lake levels? Explain4. The face of the bluff in figure 4.61 is littered with debeis from the abandoned house perched on top What additional signs are visible on the face of the bluff to indicate that it was undergoing severe erosion at the time the photograph was taken? your answer 2. What physical characteristics of the sediment exposed in the wave-cut clift of figure 4.61 made this cliff particularly susceptible to the wave erosion daring the high lake levels of 19877 5. Variations of the water level in Lake Superior and the other Great Lakes have considerable economic impact, Other than shoreline erosion, what are some of the effects of higher or lower levels of the lakes? 3. Figure 4.60 shows a pronounced drop in the level of Lake Michigan between 1987 and 1990. Describe the impact of this drop on the sand bluff in figure 4.61. continued) 1950 1954 1958 1902 1968 1970 1074 178 1986 1990 1994 1968 202 zm 2010 2014 Date (Year) Figure 4.60 Water levels of Lake Michigan, 1950-2012: mean water level (MWL), 1860 theough the end of 2012 186 PART IV

Explanation / Answer

U have to repost this question with Fig 4.61 which you have not posted otherwise it cannot be answered. The lake level rise and fall are attributed to transgression and regression which in turn is related to accomodation space. All such factors are controlled by geology

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