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[1]GUO Xingxing,LÜ,Chunjuan,et al.Effects of Rainfall Intensity and Slope Gradient on Runoff and Sediment Production on the Slope Before and After Reclamation in Iron Tailings[J].Research of Soil and Water Conservation,2019,26(01):8-13.

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Effects of Rainfall Intensity and Slope Gradient on Runoff and Sediment Production on the Slope Before and After Reclamation in Iron Tailings

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 8-13 Column: Public date: 2019-02-28

Title:: Effects of Rainfall Intensity and Slope Gradient on Runoff and Sediment Production on the Slope Before and After Reclamation in Iron Tailings

Author(s):: GUO Xingxing, LÜ Chunjuan, CHEN Dan, GUO Yansong, WANG Yu; College of Resources and Environment, Shanxi Agricultural University, Taigu, Shanxi 030801, China

Keywords:: simulated rainfall; iron tailings; reclamation slope; runoff and sediment yield

CLC:: S157.1

DOI:: -

Abstract:: The rainfall simulation technique was applied to study the characteristics of runoff and sediment yield under the combination of rain intensity and slope on slope before and after reclamation in the iron tailings. The results showed that:(1) the influence of various factors on runoff and sediment yield on slope decreased in the order:rainfall intensity > slope gradient > substrate type; (2) in the case of bare slopes of iron tailings, rainfall intensity significantly affected runoff on the slope, and the runoff presented the increasing trend with the increase of rainfall intensity and slope gradient;as the rainfall intensity increased, its role as the dominant factor of slope runoff was prominent, and the phenomenon covering the effect of slope gradient on the runoff occurred;the sediment yield increased with the increase of rainfall intensity, the increase of sediment yield became larger when the slope gradient was greater, the influences of rainfall intensity and slope gradient on the sediment yield were significant; (3) under the condition of designed reclamation slope with 25°, in terms of the effect of runoff reduction, the patterns of runoff reduction among different substrates were similar, and the effects were little different; with the increase of rainfall intensity, the effect of runoff reduction gradually disappeared;considering the effect of sediment reduction only, the effects of sediment reduction on different reclamation slopes were different because of the different substrates; with respect to comprehensive consideration of sediment reduction effects under different rainfall intensities, it was the best choice to use the mixture of iron tailings and mushroom residues as the substrate for slope reclamation. The results can provide empirical references and reasonable suggestions for the prevention and control on erosion on bare iron tailing slope and the reclamation of iron tailing pond.

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