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  • Variability of particle size distributions of upward/downward splashed materials in different rainfall intensities and slopes

    Author(s)
    Sadeghi, Seyed Hamidreza
    Harchegani, Mahboobeh Kiani
    Asadi, Hossein
    Griffith University Author(s)
    Asadi, Hossein
    Year published
    2017
    Metadata
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    Abstract
    The particle size distribution (PSD) of the splashed sediment is expected to vary depending on rainfall intensity, slope steepness and slope position. This study therefore discusses the results of analysis of laboratorial experiments to compare PSDs of splashed materials in upward and downward directions of splash cup with original soil PSDs before runoff initiation from different parts of an erosion plot under different rainfall intensities at various slope gradients. To achieve the objectives, a set of laboratorial experiments were conducted using rainfall simulator at erosion plots scale. The rainfall intensities of 30, ...
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    The particle size distribution (PSD) of the splashed sediment is expected to vary depending on rainfall intensity, slope steepness and slope position. This study therefore discusses the results of analysis of laboratorial experiments to compare PSDs of splashed materials in upward and downward directions of splash cup with original soil PSDs before runoff initiation from different parts of an erosion plot under different rainfall intensities at various slope gradients. To achieve the objectives, a set of laboratorial experiments were conducted using rainfall simulator at erosion plots scale. The rainfall intensities of 30, 60, and 90 mm h− 1 were applied at 5, 15 and 25% plot slopes for a soil collected from Kojour rangeland watershed in the Alborz Mountains, northern Iran. Besides very oft-reported results of more splashed material in downward direction and positive effects of rainfall intensities (P > 0.05) on rate of splashed materials, it was found that there were significant differences between clay, silt and sand contents of original soil and upward and downward splashed materials on slopes of 5 and 15% in all study rainfall intensities. In general, comparison of D10, D50 and D90 of splashed materials in upward and downward splash cups were larger than those of original soil. Furthermore, the sorting of splashed materials in upward and downward of splash cups with respective amounts of 4.84–6.62 μm and 5.13–6.54 μm under different rainfall intensities and slopes were less than that of the original soil (8.12 μm).
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    Journal Title
    Geoderma
    Volume
    290
    DOI
    https://doi.org/10.1016/j.geoderma.2016.12.007
    Subject
    Environmental sciences
    Biological sciences
    Agricultural, veterinary and food sciences
    Science & Technology
    Life Sciences & Biomedicine
    Soil Science
    Agriculture
    Erosion evolution
    Publication URI
    http://hdl.handle.net/10072/409551
    Collection
    • Journal articles

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