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Identifying gullies in bolin creek watershed. Christina Hurley Alyssa James Carly Buch Nicole Meyer. Introduction to Gullies. What is a Gully? Where do Gullies occur?. Flow Chart. Soils. Factors that affect soil erodibility. Particle Size Organic Matter Content

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identifying gullies in bolin creek watershed

Identifying gullies in bolin creek watershed

Christina Hurley

Alyssa James

CarlyBuch

Nicole Meyer

introduction to gullies
Introduction to Gullies
  • What is a Gully?
  • Where do Gullies occur?
factors that affect soil erodibility
Factors that affect soil erodibility
  • Particle Size
  • Organic Matter Content
  • Plant/vegetation and animal life
  • Climate
  • Land Management
  • Slope and length of slope
  • Precipitation
considering other factors
Considering other factors
  • Slope >10
  • Loamy soils
  • High Runoff
  • Poor Drainage Class
impervious cover has larger influence than slope
Impervious Cover has Larger Influence than Slope

Flow accumulation weighted by impervious cover

Slope

conclusions
Conclusions
  • Existing gullies were not by outlets with large watersheds, or with necessarily high stream powers
    • Means that it is difficult to predict where gullies will form
    • A larger sample size of existing gullies might yield more conclusive results
  • Impervious cover had a more significant influence on stream power that slope overall
  • Outlets with a higher stream power going into the outlet were more likely to have gullies (there or below the outlet)
  • Soil T-factor has strong influence on the formation of gullies
future considerations
Future Considerations
  • In order for Orange County to prevent further gullies from forming they should continue to watch:
    • Present soil mass movement and rate
    • Parent material
    • Cemented, compacted or impermeable subsoil layers
    • Area impervious upstream
    • Size of watershed
    • Stream power
    • Root distribution
    • Vegetation type and distribution
    • Saturated hydraulic conductivity
    • Pore water pressure
    • Precipitation occurrence an distribution
    • Temperature fluctuations
    • Degree of weathering
    • Dips parallel to slopes along streams
  • Summarized from Brooks, 1997