the rainsplash effect on varying slopes ashley desmond dave brennan december 5, 2001
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The Rainsplash Effect on Varying Slopes
Ashley Desmond
Dave Brennan
December 5, 2001
Centennial WoodsBurlington, VT
Goals:
The purpose of our project was to determine the extent which these factors control erosion:
- Vegetation- Slope Angle- Precipitation
TRENCH SETUP AND SITES
METHODS OF SEDIMENT EXTRACTION
Site Descriptions
Site 1 and site 2 had similar slope angles
Site 3 had a dramatically steeper slope than did sites 1 and 2
Site 2 was densely vegetated, sites 1 and 3 were not
Sediment Totals and Ratios
Site 1: 1.05 .42 .33 3.76% 8.73%
Site 2 : 1.98 1.27 .60 8.05% 12.80%
Site 3 : 18.62 16.14 7.43 88.19% 4.45%
Trial 1 Trial2 Trial3% of total sediment L.O.I.
In (g)
s e d im e n t c o l le c t e d v s . s lo p e a n g le
0
5
1 0
1 5
2 0
2 0 2 5 3 0 3 5 4 0 4 5
s lo p e a n g l e ( d e g r e e s)
Figure 6
Figure 6: The graph shows how slope angle affects the amount of sediment collected. The greater the slope angle, the more sediment that is propelled downslope by raindrops.
Site 3
Site 2 Site 1
sediment collected (g)
SEDIMENT VS. SLOPE ANGLESEDIMENT vs. SLOPE ANGLE
CONCLUSIONS
- Rainsplash is the main erosion mechanism
- Slope angle is the dominant characteristic effecting quantities of eroded sediment
- Vegetation appears to play a minimal role in controlling sediment collection
- Precipitation relates to rainsplash, therefore more precipitation leads to more sediment collected