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Evaluating Increased Erosion Potential due to Wildfires. Brian Drake CE394K – Fall 2005 Term Project Presentation. Study Area. Cedar Wildfire. Duration: 10/25/03 – 11/3/03 Size = 280,000 acres 2,232 homes destroyed 15 human deaths Suppression Cost: >$31 Mil.

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evaluating increased erosion potential due to wildfires

Evaluating Increased Erosion Potential due to Wildfires

Brian Drake

CE394K – Fall 2005

Term Project Presentation

cedar wildfire
Cedar Wildfire
  • Duration: 10/25/03 – 11/3/03
  • Size = 280,000 acres
  • 2,232 homes destroyed
  • 15 human deaths
  • Suppression Cost: >$31 Mil
major factors affecting soil losses
Major Factors Affecting Soil Losses
  • Vegetative Cover
  • Soil Characteristics
  • Topography
  • Intensity of Storms
modeling erosion
Modeling Erosion
  • USDA Universal Soil Loss Equation (USLE)
  • A = R∙K∙LS∙C∙P
    • A = Soil loss per unit area
    • R = Rainfall-Runoff Erosivity
    • K = Soil Erodibility
    • LS = Slope Length/Steepness Factor
    • C = Land Cover Factor
    • P = Conservation Practice Factor
rainfall runoff erosivity r
Rainfall-Runoff Erosivity (R)
  • Reflects rainfall intensity and storm energy
soil erodibility k
Soil Erodibility (K)
  • Represents susceptibility

of soil to erosion

slope length steepness ls
Slope Length/Steepness (LS)

LS = (a/22.13)0.4 (s/0.0896)1.3

DEM

land cover factor c
Land Cover Factor (C)
  • Ratio of soil loss based on vegetative cover
conservation practice factor p
Conservation Practice Factor (P)
  • Reflects impact of erosion-reduction practices
total sediment potential a
Total Sediment Potential (A)

Aave = 30.7 ton/acre/yr

Aave = 1,295 ton/acre/yr

remaining tasks
Remaining Tasks
  • Adjustments to current pre-fire calculation
    • Check for unit consistency
    • Search for more representative R-Factor
    • Ensure that LS value is accurate
  • Modify factors to model post-fire conditions
    • Increase C-Factor
resources
Resources
  • DEM:http://seamless.usgs.gov/
  • NHD:http://nhd.usgs.gov/data.html
  • USDA Soils:

http://www.ncgc.nrcs.usda.gov/products/datasets/statsgo/

  • Fire Info:http://map.sdsu.edu/fireweb/