Research article |
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Sediment yield and erosion-deposition distribution characteristics in ephemeral gullies in black soil areas under geocell protection |
WANG Xinyu1, SU Yu1, SUN Yiqiu1, ZHANG Yan2, GUAN Yinghui2, WANG Zhirong1, WU Hailong1,*() |
1School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China 2School of Soil and Water Conservation, Beijing Forestry University, Beijing 100038, China |
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Abstract Investigating the effect of geocells on the erosion and deposition distribution of ephemeral gullies in the black soil area of Northeast China can provide a scientific basis for the allocation of soil and water conservation measures in ephemeral gullies. In this study, an artificial simulated confluence test and stereoscopic photogrammetry were used to analyze the distribution characteristics of erosion and deposition in ephemeral gullies protected by geocells and the effect of different confluence flows on the erosion process of ephemeral gullies. Results showed that when the confluence flow was larger, the effect of geocell was more evident, and the protection against ephemeral gully erosion was stronger. When the confluence flow rates were 0.6, 1.8, 2.4, and 3.0 m3/h, ephemeral gully erosion decreased by 37.84%, 26.09%, 21.40%, and 35.45%. When the confluence flow rates were 2.4 and 3.0 m3/h, the average sediment yield rate of the ephemeral gully was close to 2.14 kg/(m2?min), and the protective effect of ephemeral gully erosion was enhanced. When the flow rate was higher, the surface fracture of the ephemeral gully was more serious. With an increase in confluence flow rate, the ratio of erosion to deposition increased gradually, the erosion area of ephemeral gullies was expanded, and erosion depth changed minimally. In conclusion, geocell measures changed erosion patterns by altering the rill erosion/deposition ratio, converting erosion from rill erosion to sheet erosion.
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Received: 23 July 2022
Published: 28 February 2023
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Corresponding Authors:
*WU Hailong (E-mail: wuhailong@email.tjut.edu.cn)
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