[1]Liu Hongtao,Zheng Qiyan,Li Qilong,et al.Effects of PAM on Soil Erosion Under Different Rainfall Intensities in Black Soil Areas[J].Research of Soil and Water Conservation,2023,30(06):1-10.[doi:10.13869/j.cnki.rswc.2023.06.025]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
1-10
Column:
Public date:
2023-10-10
- Title:
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Effects of PAM on Soil Erosion Under Different Rainfall Intensities in Black Soil Areas
- Author(s):
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Liu Hongtao1,2, Zheng Qiyan1,2, Li Qilong3, Zhao Ruijuan4, Li Xiaojun5
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(1.School of Water Conservancy and Environmental Engineering, Changchun University of Engineering, Changchun 130012, China; 2.Jilin Provincial Water Engineering Safety and Disaster Prevention Engineering Laboratory, Changchun 130012, China; 3.Guangdong Zhurong Engineering Design Co., Ltd., Guangzhou 510000, China; 4.Songliao Water Conservancy Commission, Changchun 130012, China; 5.Zhongshui Northeast Survey, Design and Research Co., Ltd., Changchun 130000, China)
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- Keywords:
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slope erosion; rainfall intensity; PAM(polyacrylamide); production of miscarriage sand; erosion morphology
- CLC:
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S157.1
- DOI:
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10.13869/j.cnki.rswc.2023.06.025
- Abstract:
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[Objective] The aims of this study are to explore the erosion prevention effect of different concentrations of PAM, and to provide a theoretical basis for dike treatment in black soil area of northeast China. [Methods] A total of 2 rainfall intensities(60,90 mm/h)and 5 PAM concentrations(0,2,3,4,5 g/m2)were set by artificial rainfall simulation, and the effects of PAM on the erosion characteristics of runoff and sediment generation and erosion on slope under different rainfall intensities were observed, and the hydraulic parameters under each erosion pattern were analyzed. [Results](1)Under the same PAM concentration, the average runoff yield rate and average sediment yield of the slope increased with the increase of rain intensity.(2)Under the two rainfall intensities, there was an inflection point in the average runoff yield rate, and the average runoff yield rate of treatment of 3 g/m2 was the smallest. The average sediment yield decreased with the increase of PAM concentration, and the average sediment yield of treatment of 5 g/m2 was the smallest.(3)The rainfall intensity was 60 mm/h, and the erosion patterns of the slope were mainly manifested as sputtering and surface erosion. The rainfall intensity was 90 mm/h, and the slope erosion characteristics were surface erosion, some accompanied by fine trench erosion.(4)The Reynolds number(Re)was less than 500, which was laminar flow, and the Frod number(Fr)was less than 1, which belonged to slow flow. The effects of rainfall intensity on water flow shear force, water flow power and unit water flow power were greater than PAM concentration. [Conclusion] It can be seen that PAM application on the slope of the black soil area of northeast China can effectively improve the soil structure, enhance the soil water infiltration capacity, reduce the slope erosion and sediment production, and play a certain effect on the erosion prevention and control of soil embankments.