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

Question

Nome Section EXERCISE 19 D Shore Erosion and Levels of Lake Michigan 1. The record of levels for Lake Michigan (fig. 4.60) shows highs and lows over a period of 62 years Does this record suggest that the fleactuations of the lake levels follkow a regular periodicity that would permit the foeecasting of future lake levels? Explain . The face of the bluff in figure 4.61 is linscred wih your answer debris 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 pbotograph was taken? 2. What physical characteristics of the sediment exposed in the wave-cut cliff of figure 4.61 made this cliff particularly susceptible to the wave erosion daring the high lake levels of 19872 5. Variations of the water level in Lake Superice and the other Great Lakes have considerable economic impact. Other than shorcline erosion, what are some of the effects of higher or lower levels of the lakes? 3. Figure 4.60 shows a prosounced drop in the level of Lake Michigan between 1987 and 1990 Describe the impact of this drop on the sand bluf in figure 4.61. fcontinued) 1960 1964 198 1982 1900 1070 1974 1978 1962 190 1980 1904 190 2002 2008 2010 2014 Date(Year) Figure 4.60 Water levels of Lake Michigan, 1950-2012: mean water level (MWL) 1860 through the end of 201. 186 PART IV

Explanation / Answer

1) from the graph below it shows that the lake level shows regular periodicity and following are the factor that affect the level change

1) Climate = Precipitation + Runoff - Evaporations

2) Seasonal change in climate

3) Inflow and Outflow that include connecting channel flows between lakes and water level regulation

4)Diversion( In and Out of the basin)

5)Consumption uses

6) Wind and Storm event

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