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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 1
Solid Earth, 6, 311-321, 2015
https://doi.org/10.5194/se-6-311-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 6, 311-321, 2015
https://doi.org/10.5194/se-6-311-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Mar 2015

Research article | 05 Mar 2015

Aggregate breakdown and surface seal development influenced by rain intensity, slope gradient and soil particle size

S. Arjmand Sajjadi and M. Mahmoodabadi S. Arjmand Sajjadi and M. Mahmoodabadi
  • Department of Soil Science, Agriculture Faculty, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract. Aggregate breakdown is an important process which controls infiltration rate (IR) and the availability of fine materials necessary for structural sealing under rainfall. The purpose of this study was to investigate the effects of different slope gradients, rain intensities and particle size distributions on aggregate breakdown and IR to describe the formation of surface seal. To address this issue, 60 experiments were carried out in a 35 × 30 × 10 cm detachment tray using a rainfall simulator. By sieving a sandy loam soil, two sub-samples with different maximum aggregate sizes of 2 mm (Dmax2 mm) and 4.75 mm (Dmax4.75 mm) were prepared. The soils were exposed to two different rain intensities (57 and 80 mm h−1) on several slopes (0.5, 2.5, 5, 10 and 20%) each at three replicates. The result showed that for all slope gradients and rain intensities, the most fraction percentages in soils Dmax2 and Dmax4.75 mm were in the finest size classes of 0.02 and 0.043 mm, respectively. The soil containing finer aggregates exhibited higher transportability of pre-detached material than the soil containing larger aggregates. Also, IR increased with increasing slope gradient, rain intensity and aggregate size under unsteady state conditions because of less development of surface seal. However, under steady state conditions, no significant relationship was found between slope and IR. The findings of this study revealed the importance of rain intensity, slope steepness and soil aggregate size on aggregate breakdown and seal formation, which can control infiltration rate and the consequent runoff and erosion rates.

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This paper studies the effect of slope gradient, rain intensity and soil particle size distribution on aggregate breakdown. Infiltration rate was found to increase under unsteady state conditions because of less development of surface seal. Under steady state conditions, no significant relationship was found between slope and infiltration rate.
This paper studies the effect of slope gradient, rain intensity and soil particle size...
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