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[1]Zhang Baoqi,Wang Bing,Xu Huanhuan,et al.Effects of Biological Soil Crust on Dynamic Parameters of Slope Flow Under Different Rainfall Intensities in the Loess Plateau[J].Research of Soil and Water Conservation,2024,31(03):128-134.[doi:10.13869/j.cnki.rswc.2024.03.040]

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Effects of Biological Soil Crust on Dynamic Parameters of Slope Flow Under Different Rainfall Intensities in the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 128-134 Column: Public date: 2024-04-30

Title:: Effects of Biological Soil Crust on Dynamic Parameters of Slope Flow Under Different Rainfall Intensities in the Loess Plateau

Author(s):: Zhang Baoqi¹, Wang Bing^2,3, Xu Huanhuan², Zhang Huini², Ma Jinlong²; (1.Xifeng Soil and Water Conservation Scientific Experimental Station, Yellow River Water Conservancy Commission, Qingyang, Gansu 745000, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 3.Institute Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China)

Keywords:: Cyanobacteria; mossy crust; rainfall intensity; hydrodynamics; Loess Plateau

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.03.040

Abstract:: [Objective] The aims of this study are to elucidate the vital role of biological soil crust in slope flow dynamic parameters under different rainfall intensities, and evaluate the soil and water conservation function of biological soil crust. [Methods] Cyanobacteria and moss crusts were chosen as the typical model crusts to assess the effects of biological soil crusts on slope flow dynamic parameters under rainfall intensities of 60 mm/h, 90 mm/h, 120 mm/h, 150 mm/h, and 200 mm/h, respectively. [Results](1)Under all the tested rain intensifications, both flow patterns on the slopes with the Cyanobacteria and the moss crust present a laminar type. In addition, the flow patterns on the slopes with Cyanobacteria and moss crust show a rapid type under all tested rain intensities except for rapid flow type on the slope with the bryophyte crust flow under 200 mm/h rain intensification.(2)At 90, 120, 150 and 200 mm/h rainfall intensity, the velocity, runoff, and runoff coefficient on the slope with the Cyanobacteria under other rain intensities are 1.76～3.9, 4.89～9.26, and 3.91～4.13 times of those under the rainfall intensity of 60 mm/h, respectively, while the same evaluation is applied to the moss crust, the parameters are 1.34～2.56, 5.86～13.81, and 2.46～4.26, respectively. Additionally, the flow velocity and runoff increase linearly with the rainfall intensity(R²≥0.85, p<0.01), and the runoff coefficient increases linearly with the power function(R²≥0.49, p<0.05)。(3)Under the rainfall intensities of 60, 90, 120, 150 and 200 mm/h, the drag coefficient and Manning roughness coefficient on the slope with Cyanobacteria vary in the range of 0.15 to 0.74 and 0.01 to 0.03, respectively, while the drag coefficient and manning roughness coefficient the slope with moss vary from 0.82 to 3.02 and 0.03 to 0.06, respectively. With increase of rainfall intensity, the drag coefficient and Manning coefficient decrease exponentially(R²≥0.47, p<0.05).(4)Rainfall intensity and biological crusts are strongly correlated with slope hydrodynamic parameters. Under all the tested rainfall intensities, the velocity of Cyanobacteria is much higher than that of moss crust(11.77%～118.31%), while the runoff, drag coefficient, and Manning coefficient of algal crust are significantly lower than those of moss crust(1.41%～37.55%, 53.32%～90.42%, and 38.08%～73.00%). [Conclusion] The results of this study are of great significance to the characteristics of flow dynamic parameters on the slope with biological soil crust on the Loess Plateau, and provide the theoretical support for the accurate erosion prediction model.

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Last Update: 2024-04-30