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《Transactions of the Chinese Society of Agricultural Engineering》 2017-02
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Characteristics of particle separation of erosion sediment in slop surface covered with sand

Tang Shanshan;Gao Haidong;Li Zhanbin;Ren Zongping;Zhang Hui;Su Yuanyi;Zhi Zaixing;Key Laboratory of Northwest Water Resources and Environment Ecology of MOE, Xi'an University of Technology;State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources;  
Sediment size distribution greatly affects sediment transport and deposition. A better understanding of sediment sorting will improve the understanding of erosion and sedimentation processes, which in turn will improve erosion modeling. In this paper, using artificially simulated rainfall experiment, the sieved sand slope erosion and sediment grain size distribution and the change process were analyzed under the condition of 1.5 mm/min rainfall intensity, and the sieved sand slope erosion and sediment particle characteristics were explored, which aimed to further clarify the sieved sand slope erosion and sediment yield process. This paper studied the characteristics of sediment particles under different sand thickness, and there were 3 treatments, i.e. ST1(sand thickness of 0.5 cm), ST2(sand thickness of 1.0 cm), and ST3(sand thickness of 1.5 cm). Malvern 2 000 laser particle size analyzer was used to measure the sediment particle composition, which was expressed by the mean weighted diameter(MWD). The results showed that most of coarse particulate matter was washed away within 0-10 min after the runoff production began; the sediment particle content of less than 0.054 mm was ST2ST3ST1 in 0-5 min after runoff, and that of greater than 0.054 mm was ST3ST1ST2; however, the sediment content less than 0.054 mm decreased with the increase of the thickness of sand-covered, the content of sediment particles larger than 0.054 mm increased with the increase of the thickness of sand-covered after the 6th min of runoff; the erosion and sediment particles were mainly composed of silt; compared with bare slope, the E/U(effective particles/ultimate particles) value of clay in the erosion and sediment particles in 0-5 min was reduced by 36%, 64% and 58% respectively, and that of silt was reduced by 48%, 69%, 63% respectively when the thickness of sand was 0.5, 1.0, 1.5 cm respectively. For the sand covered slope, in the inter-rill erosion stage, runoff gave priority to transport the particles more than 0.054 mm, and sediment particles transported by runoff were mainly less than 0.054 mm in the rill erosion and combination of rill and interrill erosion stage; meanwhile, sand covering on slope affected the erosion sediment particle size and its existing form. The sediment particles that were eroded were mainly more than 0.054 mm at the early stage(0-10 min), and were mainly composed of the particles less than 0.054 mm after 10 min since the runoff began. The slope surface material was washed away mainly after 0-10 min since the runoff production started. Above all, after the slope was covered with sand, the clay existed in the form of aggregate, the silt existed in the form of single grain and the sand existed in the form of fine aggregate. This paper provides data support for further studying the effect of wind erosion on water erosion after sediment deposition.
【Fund】: 国家自然科学基金青年项目(41401305);国家自然科学基金重点项目(41330858);; 西安理工大学博士创新基金(310-252071505)
【CateGory Index】: S157.1
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