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

Question

Nome Section EXERCISE 19D 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? Explain. 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 claft of figure 4.61 made this cliff particularly susceptible to the wave erosion daring the high lake levels of 19877 the other Great Lakes have considerable economic impact. Other than shoreline crosicn, 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) 1960 1954 1958 1R2 1see 0 1074 178 1986 180 1994 1998 202 zm 2010 2014 Date (Year) Figure 4.60 Water levels of Lake Michigan, 1950-2012: mean water level (MW, 1860 theough the end of 2012 186 PART IV

Explanation / Answer

Answers for first three questions are as follows:

1. The levels of the lake Michigan can be roughly said to be rising periodically. The rough cycliclicty can be said to be somewhere between 4-6 years. The magnitute of lake level rise is not constant and it varies as per the graph provided.

2. Since the sediments deposited as exposed in the cliff cut face is made up of sand dunes which is extremely loose and friable sand. This makes it susceptible to high level of erosion.

3. Due to drop of sea level during 1987-1990, the face of sand dunes is exposed and it makes the ambient pressure on the sand face to reduce starting caving. This further casuses erosion by the wind.

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