1 / 69

Erosion Control and Sediment Analysis with PSIAC Method

Learn about using PSIAC Method for sediment analysis in terrain preprocessing to address fire, snowmelt, and rainstorm issues.

wandag
Download Presentation

Erosion Control and Sediment Analysis with PSIAC Method

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OUTLINE • Introduction • Problems • PSIAC Method • MUSLE Equation • Assumptions • Conclusion

  2. http://seamless.usgs.gov/ http://nhd.usgs.gov/

  3. Terrain Preprocessing (Arc Hydro) Surface Analysis (Spatial Analyst)

  4. Terrain Analysis (TauDEM) Terrain Preprocessing (Arc Hydro)

  5. Problems • Fire • Snowmelt • Large Rainstorms

  6. http://www.utahfireinfo.gov/firephotos/index.htm

  7. Roads

  8. Roads Sediment is the number one pollutant in U.S. waterways.

  9. Roads in Farmington Canyon

  10. Past Debris Flows Sources: Http://www.geohazards.cr.usgs.gov/factsheets/html_files/debrisflow/fs176.97.html Http:/www.ugs.state.ut.us/online/pi-70/debrisflow.htm

  11. PSIAC Method Pacific Southwest Inter Agency Committee (1968) Annual Yield = .0833 e ^ (.0359 * FR) FR = Sediment Rating Factor = sum of (9) different factors.

  12. MUSLE Equation Ys=a*[Q*qp]β*K*LS*CP*S

  13. Ys – Total Tons per Event Q – Storm Runoff (acre-ft) qp – peak runoff (cfs)

  14. a,β – storm factors Typical Rain Storm a=95 β=.56 Snow Melt Flood a=120 β=.3

  15. K – Soil Erodibility Factor LS – Slope Factor (length and steepness) CP – Cover and Management Practice Factor SDR – Sediment Delivery Ratio

  16. gs=a[Q*qp]^b*K*LS*CP*SDR Q = Storm Runoff (acre-ft) qp= Peak runoff (cfs) a = 95 b= .56

  17. Q=CIA Q=Runoff C=Runoff Coefficient I=Intensity of rainfall (assume 1 in/hr) A=Area of Catchment

  18. C=.17

  19. C=.3

  20. q= Accumulation of Catchment Accumulation of Basin * Peak Flow

  21. Accumulation of Each Catchment

  22. Peak Flow For Farmington Canyon

  23. K Factor

  24. STATSGO No Data Found

  25. SSURGO No Data Found

  26. Soil Distribution

  27. Soil Distribution (cont.)

  28. Soil Distribution (cont.)

  29. Soil Distribution (cont.)

  30. Calculated K Factor

  31. K Factor K factor is soil erodibility factor which represents both susceptibility of soil to erosion and the rate of runoff, as measured under the standard unit plot condition. Soils high in clay have low K values, about 0.05 to 0.15, because they resistant to detachment. Coarse textured soils, such as sandy soils, have low K values, about 0.05 to 0.2, because of low runoff even though these soils are easily detached. Medium textured soils, such as the silt loam soils, have a moderate K values, about 0.25 to 0.4, because they are moderately susceptible to detachment and they produce moderate runoff. Soils having a high silt content are most erodible of all soils. They are easily detached; tend to crust and produce high rates of runoff. Values of K for these soils tend to be greater than 0.4. http://www.iwr.msu.edu/rusle/kfactor.htm

  32. LS Factor Accounts for length and Steepness of the Slopes

  33. Catchment GridID

  34. Cross Section Found Using 3-D Analyst

  35. Slope of Watershed

  36. Mean Slope of CatchmentsUsing zonal Statistics

  37. LS Factor • LS=(l/72.6)m((430sin2θ+30sinθ+0.43)/6.613)) • Where m =.5 Slope >5% l = slope length (ft) θ = slope Angle Degree

  38. LS Factor

  39. The Value of Cp

More Related