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http://dx.doi.org/10.3741/JKWRA.2013.46.5.559

Effects of Surface Compaction Treatment on Soil Loss from Disturbed Bare Slopes under Simulated Rainfalls  

Park, Sang Deog (Dept. of Civil Engineering, Gangneung-Wonju National University)
Shin, Seung Sook (Institute for Disaster Prevention, Gangneung-Wonju National University)
Kim, Seon Jeong (High Impact Weather Research Center, National Institute of Meteorological Research, KMA)
Choi, Byoungkoo (Research Center for River Flow Impingement and Debris Flow, Gangneung-Wonju National University)
Publication Information
Journal of Korea Water Resources Association / v.46, no.5, 2013 , pp. 559-568 More about this Journal
Abstract
Surface compaction significantly impacts runoff and soil erosion under rainfall since it leads to changes of soil physical characteristics such as increase of bulk density and shear stress, change of microporosity, and decrease of hydraulic conductivity. This study addressed surface compaction effects on runoff and soil loss from bare and disturbed soils that are commonly distributed on construction sites. Thirty-six rainfall simulations from three replicates of each involving rainfall intensities (68.5 mm/hr, 95.6 mm/hr) and plot gradients ($5^{\circ}$, $12.5^{\circ}$, $20^{\circ}$) were conducted to measure runoff and soil loss for two different soil surface treatments (compacted surface, non-compacted surface). Compacted surface increased significantly soil bulk density and soil strength. However, the effect of surface treatments on runoff changed with rainfall intensity and plot gradient. Rainfall intensity and plot gradient had a positive effect on mean soil loss. In addition, the effect of surface treatments on soil loss responded differently with rainfall intensity and plot gradient. Compacted surfaces increased soil loss at gentle slope ($5^{\circ}$) while they decreased soil loss at steep slope ($20^{\circ}$). These results indicate that there exists transitional slope range ($10{\sim}15^{\circ}$) between gentle and steep slope by surface compaction effects on soil loss under disturbed bare soils and simulated rainfalls.
Keywords
rainfall simulation; soil erosion; runoff; surface roughness; surface compaction;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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