The Rainsplash Effect on Varying Slopes Ashley Desmond Dave Brennan December 5, 2001.
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Transcript of The Rainsplash Effect on Varying Slopes Ashley Desmond Dave Brennan December 5, 2001.
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