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

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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?


Flow chart

Flow Chart


Soils

Soils


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


Mapped gully soil types

Mapped Gully Soil Types


K value as an indicator

K Value as an indicator


T factor as an indicator

T Factor as an Indicator


Outlets that fall in high k values and high t factors

Outlets that fall in high K values and high T factors


Considering other factors

Considering other factors

  • Slope >10

  • Loamy soils

  • High Runoff

  • Poor Drainage Class


Outlet wastersheds

Outlet Wastersheds


Digitizing outlets and calculating watersheds

Digitizing Outlets and Calculating Watersheds


Outlet watersheds

Outlet Watersheds


Outlet watersheds1

Outlet Watersheds


Outlet watersheds2

Outlet Watersheds


Outlet watersheds3

Outlet Watersheds


Outlet watersheds near gullies

Outlet Watersheds Near Gullies


Stream power

Stream Power


Stream power and outlets

Stream Power and Outlets


Impervious cover has larger influence than slope

Impervious Cover has Larger Influence than Slope

Flow accumulation weighted by impervious cover

Slope


Stream powers at outlets and existing gullies

Stream powers at outlets and existing gullies

416

1406


Stream powers at outlets

Stream powers at outlets

1393


Stream powers and outlets

Stream Powers and Outlets

307


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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