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[1]Zou Hao,Li Yiyang,Wei Xiying,et al.Effects of PAM molecular weight on sediment production in soil embankment under different rainfall intensities[J].Research of Soil and Water Conservation,2025,32(01):131-140.[doi:10.13869/j.cnki.rswc.2025.01.020]

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Effects of PAM molecular weight on sediment production in soil embankment under different rainfall intensities

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 01 Page number: 131-140 Column: Public date: 2025-01-10

Title:: Effects of PAM molecular weight on sediment production in soil embankment under different rainfall intensities

Author(s):: Zou Hao¹, Li Yiyang^2,3, Wei Xiying⁴, Zheng Qiyan⁵, Liu Hongtao²; (1.China Water Northeast Survey,Design and Research Co.,Ltd.,Changchun 130012,China; 2.Faculty of Hydraulic and Environmental Engineering,Changchun Institute of Technology,Changchun,Jilin 130012,China; 3.Changchun Hongrun Irrigation Technology Co.,Ltd.,Changchun,Jilin 130012,China; 4.Yongji County Xingxing Whistle Reservoir Irrigation District Management Center,Jilin,Jilin 132214,China; 5.Jilin Provincial Institute of Water Resources,Changchun,Jilin 130012,China)

Keywords:: rainfall intensity; PAM(polyacrylamide)molecular weight; flow reduction and sediment reduction; earthen embankments

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2025.01.020

Abstract:: [Objective]The objectives of this study are to explore the effect of different molecular weights of PAM on the erosion prevention of the protective slope of an embankment in Northeast China, and to explore the effect of PAM solution on the slope surface of the embankment under spraying mode, so as to provide a theoretical basis for the treatment of soil embankment in northeast China. [Methods]An indoor artificial simulated rainfall experiment was designed to study the backwater slope of the embankment in the upper reaches of a black soil area in northeast China, and three different rainfall intensities(180, 200, 220 mm/h), bare ground(molecular weight 0)and four different PAM molecular weights(1 200, 1 400, 1 600, 1 800)were set up, and the PAM concentration was 4 g/m², and the PAM solution was sprayed on the experimental slope with 4 g/m²PAM ratio of 3.5 L water. The characteristics of runoff and sediment generation on the slopes with different molecular weights of PAM under three rainfall intensities were studied, and their hydraulic parameters were analyzed. [Results](1)Under the same rainfall intensity, the amount of runoff and sediment yield on the slope with PAM is smaller than that on the bare slope.(2)Under the same molecular weight of PAM, runoff and sediment generation on the slope increases with increasing of rainfall intensity. Under the three types of rainfall intensities, the sediment reduction effect of 18 million molecular weight was the best, and the maximum sediment reduction was 57.74%.(3)By calculating the Frode number(Fr)and Reynolds number(Re)of slope flow, it is found that Re<500 shows that the flow form is laminar flow, and when the rainfall intensity is 220 mm/h, the flow pattern of bare slope is rapid, and the rest are slow flow. Rainfall intensity, PAM molecular weight to water flow power, and unit water flow power can be described by power functions. [Conclusion]It can be seen that the application of PAM solutions with different molecular weights on the slope of an embankment in northeast China can effectively reduce the amount of sediment produced by runoff, and the effect of sediment reduction is particularly obvious, and in the molecular weight interval of PAM selected in the experiment, the application of PAM with a molecular weight of 18 million has the most significant effect on the sediment reduction of the experimental slope, and the PAM can improve the infiltration capacity of soil water and provide a reference for the control of soil erosion in soil embankments.

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Last Update: 2025-01-10