Comparing grain size distribution of sediment and original soil under raindrop detachment and raindrop-induced and flow transport mechanism |
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| Authors: | Mahboobeh Kiani-Harchegani Hossein Asadi |
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| Institution: | 1. Department of Watershed Management Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran;2. Department of Soil Science, Faculty of Agriculture, University of Tehran, Karaj, Iran |
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| Abstract: | The grain size distribution (GSD) of sediment in comparison with the original soil GSD is discussed under different slopes (5, 15 and 25%) and rainfall intensities (30, 60 and 90 mm h–1 with respective duration of 30, 15 and 10 min) but identical runoff (15 mm). The sediment quantification was carried out by raindrop-induced flow transport (RIFT) or/and transport by flow (FT) using a rainfall simulator and a 6 × 1 m2 erosion plot and a silt loam. The results show a high degree of enrichment for size classes of 2–4 and 4–8 μm and a high degree of depletion for size classes of >63 μm under different slopes and rainfall intensities. In addition, the results show that the experimental enrichment ratio (ER) for particle size <16 μm under different slopes and rainfall intensities was greater than 1, while the ER for particle size >32 μm was less than 1. |
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| Keywords: | erosion evolution eroded sediment erosion plot grain size distribution rainfall simulation sediment transportation |
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