Overland erosion due to freezethaw cycling
9
Sediment transport and erosion in both the FT and C bins of the intermediate
moisture series were consistently greater than corresponding tests of the high
moisture series. The high moisture series had saturated soil conditions, and
measurable settlement of the soil surface occurred between pre-test and post-test.
Our initial hypothesis is that the decrease in erodibility with increased moisture
resulted from soil consolidation. The pattern displayed by the median sediment
concentration in Figure 7 is substantially the same as those of the mean and time-
weighted concentrations in Figure 6.
80
FT
70
60
50
40
30
20
10
C
0
0
2
4
6
8
10
12
14
16
18
20
120
100
FT
80
60
40
20
C
0
0
2
4
6
8
10 12 14 16 18 20
Test #
Figure 7. Median and maximum sediment concentrations.
However, the maximum concentrations given in Figure 7 are not completely
consistent with the other measures, but are clearly affected by slope at intermedi-
ate and high soil moisture. Again, test 15 concentrations are anomalously low.
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