Identifying gullies in bolin creek watershed
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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


Outlet wastersheds
Outlet Wastersheds










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


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