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Comparing grain size distribution of sediment and original soil under raindrop detachment and raindrop-induced and flow transport mechanism

Author:
Kiani-Harchegani, Mahboobeh, Sadeghi, Seyed Hamidreza, Asadi, Hossein
Source:
Hydrological sciences journal 2018 v.63 no.2 pp. 312-323
ISSN:
2150-3435
Subject:
particle size, particle size distribution, rain intensity, runoff, sediments, silt loam soils
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.
Agid:
5956258