a. Before test.
b. After test.
Figure 25. Model riprap before and after test 4. The difference between these photographs
indicates the extent of rock movement.
a. Before.
b. After.
Figure 26. Model riprap before and after test 5. The difference between these photographs
indicates the extent of rock movement.
shown in Figure 27 show a typical pattern of ice
that some of the rock material was removed from
action on riprap, in that the rock was gouged out
the bed and deposited on top of the ice pile. In some
just below or at the waterline and was deposited
tests, the rocks were tossed from the bed and over
in a hump above the waterline.
the top edge of the bank. Figure 19 shows the rocks
During a test in which ice piled up, we observed
in the ice pile towards the end of the test 20. After
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