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    Modeling Top Soil Erosion and Mass Failures in Steep Agricultural Slopes: Integrating WEPP and a Landslide Model

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    12623517_WCCANR - Reno Cochrane-Acharya.pdf (201.2Kb)
    Author
    Cochrane, T.A.
    Acharya, G.
    Date
    2009
    Permanent Link
    http://hdl.handle.net/10092/3803

    Steep agricultural hillslopes are not only subjected to soil erosion, but also have a probability of failure. In hilly country were both soil erosion and landslide processes are active, the interaction between these processes is critical. A model called WEPP-SLIP was developed that integrates erosion modeling and landslide prediction to determine sediment delivery pre and post landslide failures. Initially, WEPP is used to estimate pre-failure erosion. The landslide model then predicts where a mass failure may occur along the slope. Changes in topography and soil structure are estimated from the predicted magnitude of the landslide. The WEPP model is then used again with the new topography to predict postfailure erosion. A flume based experiment was used to validate the modeling with loess and sandy type soil representative of hilly sheep pasture land in New Zealand. Results showed a good correlation between predicted and measured erosion and runoff. In fallow conditions, post-failure erosion was shown to be smaller than pre-failure erosion due to changes in slope and soil properties resulting from the failure. The opposite is true for hillslopes covered with grass, as slope failures disturb the cover resulting in greater erosion. Flume based results indicate that sediment yields during failures were high. WEPP-SLIP can be applied for individual hillslope profiles; however, efforts are on the way to create a spatially distributed model. The model will be used to improve management practices and calculate the long term implications of mass movements in hilly slopes.

    Subjects
    landslides
     
    erosion
     
    WEPP
     
    steep slopes
     
    modeling
     
    Fields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300100 Soil and Water Sciences
     
    Fields of Research::260000 Earth Sciences::260100 Geology::260107 Structural geology
     
    Fields of Research::300000 Agricultural, Veterinary and Environmental Sciences::300100 Soil and Water Sciences::300105 Applied hydrology (drainage, flooding, irrigation, quality etc)
    Collections
    • Engineering: Conference Contributions [2012]
    Rights
    https://hdl.handle.net/10092/17651

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