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Soil Erosion on the American River. Brittany Tucker. American River. http://www.frankbobbio.com/photogallery/Aerial/Folsom%20Lake%20&%20Lake%20Natoma/folsom_lake__lake_natoma_aerial.htm. Purpose. Erosion studies provide scour depths

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american river
American River

http://www.frankbobbio.com/photogallery/Aerial/Folsom%20Lake%20&%20Lake%20Natoma/folsom_lake__lake_natoma_aerial.htm

purpose
Purpose
  • Erosion studies
  • provide scour depths
  • Scour depths determine the level a foundation must be dug to
  • Strong foundation is required to prevent major structural issues
    • Cracks
    • Breaks
    • Collapses
slide4
Data
  • Testing is performed at Texas A&M University
  • Erosion Function Apparatus (EFA) is used to determine erodibility level
    • Soil sample is placed in viewing window of water tunnel
    • Water is run over sample at set velocity
    • Amount of erosion is measured after pre-determined interval
erodibility
Erodibility
  • Five levels of erosion
    • Level I: Very High Erodibility
    • Level II: High Erodibility
    • Level III: Medium Erodibility
    • Level IV: Low Erodibility
    • Level V: Very Low Erodibility
    • Level VI: Non-Erosive
analysis method
Analysis Method
  • 11 American River Samples Analyzed
  • Statistical data generated for 2 samples
    • Used all data as sample of American River Soil
    • Used data from each sample at 1 m/s flow rate
total sample
Total Sample

The data generated in the table and the graph do not show any particular pattern.

total sample1
Total Sample

From the histogram it is difficult to determine whether the data is skewed or not because it is concentrated to the same area.

fixed flow sample
Fixed Flow Sample
  • Overall data was not statistically helpful
  • the data for a 1 m/s flow rate was analyzed
  • One data point was taken from each report
    • The point closest to 1 m/s flow rate
fixed flow sample1
Fixed Flow Sample

This data provides better grouping for such a broad analysis spectrum.

fixed flow sample2
Fixed Flow Sample

The fixed velocity case shows a normal distribution with the bulk of the samples being classified as medium erodibility.

fixed flow sample3
Fixed Flow Sample

To determine what the population mean erosion rate and standard deviation would be for a given flow velocity (1 m/s) would be, the equations below were used. With a confidence interval of 90% (α = .05), sample standard deviation (s) equal to 371.42 and sample size of 11. Assuming a normal distribution and using the t-distribution table the value of is equal to 1.812

The fact that Δμ is so close to μ is further proof that there needs to be further testing increase the number of data points for each test and that the data needs to be broken down in to more precise categories than the current erodibility levels

conclusion
Conclusion
  • Majority of samples were of high or medium erodibility
    • Any structure built will require a deep scour level
  • Sample wills require additional points on a more precise scale
  • Fixed flow is a better sample for statistical analysis with a much lower variance
    • maintaining a similar conclusion to the large sample data
2f 11 142u

Very High

Erodibility

I

High

Erodibility

II

Medium

Erodibility

III

Low

Erodibility

IV

Very Low

Erodibility

V

Non-Erosive

VI

2F-11-142U
2f 11 175u

High

Erodibility

II

Medium

Erodibility

III

Low

Erodibility

IV

Very Low

Erodibility

V

Non-Erosive

VI

2F-11-175U

Very High

Erodibility

I

2f 11 177u t4

Very High

Erodibility

I

High

Erodibility

II

 Medium Erodibility III

Low Erodibility IV

2F-11-177U T4
2f 11 179u t2
2F-11-179U T2

Medium

Erodibility

III

Low

Erodibility

IV

 Very Low Erodibility IV

Non_Erosive VI

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