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[1]TIAN Naling,WANG Zhanli,ZHANG Qingwei,et al.Effects of Nature Polymer Derivatives on the Flow Velocity and Sediment Yield of Loess Hillslope[J].Research of Soil and Water Conservation,2019,26(01):22-28.

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Effects of Nature Polymer Derivatives on the Flow Velocity and Sediment Yield of Loess Hillslope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 22-28 Column: Public date: 2019-02-28

Title:: Effects of Nature Polymer Derivatives on the Flow Velocity and Sediment Yield of Loess Hillslope

Author(s):: TIAN Naling¹, WANG Zhanli^1,2, ZHANG Qingwei¹, WANG Dongdong¹, LIU June³, JIAO Nian⁴; 1. 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;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: natural polymer derivative; flow velocity; dry spreading; spraying; sediment reduction

CLC:: S157.1

DOI:: -

Abstract:: The natural polymer derivative (NPD) is a novel type of macromolecular polymer which is also a new material for the prevention of water and soil loss. This study adopted chemical regulation technique, which was a non-traditional method, to conserve water and soil. In order to explore the effects of NPD on the flow velocity and sediment yield in the soil erosion process on loess hillslopes, two applicable methods (dry spreading and spraying) and three applicable dosages (1, 3 and 5 g/m²) of NPD were conducted at the rainfall intensities of 1.0 mm/min, 1.5 mm/min, and 2.0 mm/min on the slopes with gradient of 15°, bare slope was set as control. The results showed that:(1) when NPD was applied in the soil surface, the flow velocity increased moderately in the first few minutes, and then gradually approached a steady state in the late stage of the rainfall events, of which trend was somewhat similar to that in the bare slope surface; the relationship between instantaneous flow velocities and time during a rainfall event could be described by logarithmic equation; compared with the bare slope, dry spreading and spraying significantly reduced the flow velocity; under small rainfall intensity, dry spreading delayed initial runoff time from 8 to 19 min, but initial runoff times of spraying were 1~2 min earlier than that on bare slope under three rainfall intensities; (2) compared with the bare slope, the application of NPD had the significant effect of reducing the flow velocity, and the greater the rainfall intensity was, the poorer the effect of reduction was; application different doses of NPD to reduce flow velocity ranged from 13.2% to 54.3% compared with the bare slope; among them, dry spreading dose of 3 g/m² and spraying dose of 5 g/m² were relatively good for reduction of the flow velocity; (3) the application of NPD had significant effect on sediment reduction, and the ranges of sediment reduction rates varied from 30.6% to 71.2% compared with the bare slope; Application of dose of 5 g/m² had best effect on sediment reduction under dry spraying or spraying; (4) the response relationship of erosion modulus of bare slope to average flow velocity or the response relationship of erosion modulus of dry spreading and spraying NPD to average flow velocity all can be expressed by logarithmic equations; the effect of spreading and spraying on reducing the velocity of flow was more significant than that of sediment reduction.

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