Erosion by Water: Erosivity and Erodibility

Peter Kinnell

    Research output: A Conference proceeding or a Chapter in BookChapter

    Abstract

    Conceptually, rainfall erosivity is the capacity of rain to produce erosion, whereas soil erodibility is the susceptibility of the soil to be eroded. However, no absolute numerical values can be determined for them because rainfall erosion results from various forms of erosion (splash erosion, sheet erosion, rill erosion, interrill erosion) that are driven by different forces. Originally, the terms erosivity and erodibility were associated with the rainfall factor (R) and the soil factor (K) in the Universal Soil Loss Equation where the event erosivity factor was given by the product of the kinetic energy of the storm (E) and the maximum 30 min rainfall intensity (I30). Soil loss at the scale at which the USLE applies results from the discharge of sediment with runoff, but because the USLE does not include any direct consideration of runoff in the event erosivity factor, it is not good at accounting for event soil loss at some geographic locations. Erodibility values have units of soil loss per unit of the erosivity index and cannot be used with erosivity indices other than the one that was associated in their determination. Some models ignore this fact and so ignore certain fundamental rules that should apply to the modelling of water erosion. So-called process-based models attempt to account for the effects of the various forms of erosion and do consider the effect of runoff on erosivity associated with each form. Particles travel across the soil surface at virtual velocities that vary from the velocity of the flow to near zero. Little regard is given to this fact in the determination of soil erodibility values.
    Original languageEnglish
    Title of host publicationEncyclopedia of Environmental Management
    EditorsSven Erik Jorgensen
    Place of PublicationUSA
    PublisherTaylor & Francis
    Pages980-990
    Number of pages11
    ISBN (Print)9781439829271
    Publication statusPublished - 2012

    Fingerprint

    erosivity
    erodibility
    erosion
    Universal Soil Loss Equation
    soil
    water
    runoff
    rainfall
    interrill erosion
    sheet erosion
    rill
    water erosion
    precipitation intensity
    kinetic energy
    soil erosion
    soil surface
    sediment
    modeling

    Cite this

    Kinnell, P. (2012). Erosion by Water: Erosivity and Erodibility. In S. E. Jorgensen (Ed.), Encyclopedia of Environmental Management (pp. 980-990). USA: Taylor & Francis.
    Kinnell, Peter. / Erosion by Water: Erosivity and Erodibility. Encyclopedia of Environmental Management. editor / Sven Erik Jorgensen. USA : Taylor & Francis, 2012. pp. 980-990
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    abstract = "Conceptually, rainfall erosivity is the capacity of rain to produce erosion, whereas soil erodibility is the susceptibility of the soil to be eroded. However, no absolute numerical values can be determined for them because rainfall erosion results from various forms of erosion (splash erosion, sheet erosion, rill erosion, interrill erosion) that are driven by different forces. Originally, the terms erosivity and erodibility were associated with the rainfall factor (R) and the soil factor (K) in the Universal Soil Loss Equation where the event erosivity factor was given by the product of the kinetic energy of the storm (E) and the maximum 30 min rainfall intensity (I30). Soil loss at the scale at which the USLE applies results from the discharge of sediment with runoff, but because the USLE does not include any direct consideration of runoff in the event erosivity factor, it is not good at accounting for event soil loss at some geographic locations. Erodibility values have units of soil loss per unit of the erosivity index and cannot be used with erosivity indices other than the one that was associated in their determination. Some models ignore this fact and so ignore certain fundamental rules that should apply to the modelling of water erosion. So-called process-based models attempt to account for the effects of the various forms of erosion and do consider the effect of runoff on erosivity associated with each form. Particles travel across the soil surface at virtual velocities that vary from the velocity of the flow to near zero. Little regard is given to this fact in the determination of soil erodibility values.",
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    Kinnell, P 2012, Erosion by Water: Erosivity and Erodibility. in SE Jorgensen (ed.), Encyclopedia of Environmental Management. Taylor & Francis, USA, pp. 980-990.

    Erosion by Water: Erosivity and Erodibility. / Kinnell, Peter.

    Encyclopedia of Environmental Management. ed. / Sven Erik Jorgensen. USA : Taylor & Francis, 2012. p. 980-990.

    Research output: A Conference proceeding or a Chapter in BookChapter

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    AB - Conceptually, rainfall erosivity is the capacity of rain to produce erosion, whereas soil erodibility is the susceptibility of the soil to be eroded. However, no absolute numerical values can be determined for them because rainfall erosion results from various forms of erosion (splash erosion, sheet erosion, rill erosion, interrill erosion) that are driven by different forces. Originally, the terms erosivity and erodibility were associated with the rainfall factor (R) and the soil factor (K) in the Universal Soil Loss Equation where the event erosivity factor was given by the product of the kinetic energy of the storm (E) and the maximum 30 min rainfall intensity (I30). Soil loss at the scale at which the USLE applies results from the discharge of sediment with runoff, but because the USLE does not include any direct consideration of runoff in the event erosivity factor, it is not good at accounting for event soil loss at some geographic locations. Erodibility values have units of soil loss per unit of the erosivity index and cannot be used with erosivity indices other than the one that was associated in their determination. Some models ignore this fact and so ignore certain fundamental rules that should apply to the modelling of water erosion. So-called process-based models attempt to account for the effects of the various forms of erosion and do consider the effect of runoff on erosivity associated with each form. Particles travel across the soil surface at virtual velocities that vary from the velocity of the flow to near zero. Little regard is given to this fact in the determination of soil erodibility values.

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    Kinnell P. Erosion by Water: Erosivity and Erodibility. In Jorgensen SE, editor, Encyclopedia of Environmental Management. USA: Taylor & Francis. 2012. p. 980-990