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[1]JIA Lianlian,FAN Bing,ZHU Bingbing.Regulation Mechanism of Different Grass Spatial Distribution on the Runoff Retardation Effect on a Slope[J].Research of Soil and Water Conservation,2021,28(03):371-376.

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Regulation Mechanism of Different Grass Spatial Distribution on the Runoff Retardation Effect on a Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 03 Page number: 371-376 Column: Public date: 2021-04-20

Title:: Regulation Mechanism of Different Grass Spatial Distribution on the Runoff Retardation Effect on a Slope

Author(s):: JIA Lianlian¹, FAN Bing¹, ZHU Bingbing²; (1.Upper and Middle Yellow River Bureau, Yellow River Conservancy Commission of the Ministry of Water Resources, Xi'an 710021, China; 2.School of Geography and Tourism, Shaanxi Normal University, Xi'an 710061, China)

Keywords:: grass spatial distribution; runoff velocity; runoff retardation effect; hydrodynamic recovery space

CLC:: S157.1

DOI:: -

Abstract:: In order to study the mechanisms of influence of vegetation on the runoff retardation effect of a slope, the regulating effect of a grass strip on runoff velocity was quantified after the characteristics of runoff and sediment yield under different spatial distribution conditions of vegetation were analyzed by means of the indoor simulated rainfall experiments on a selected slope. The results show that the grass strip planted at a place about 60% from the top of the slope can fully exert its runoff retardation effect, with runoff velocity regulating scope accounting for 70% of the whole slope, and runoff velocity decreasing by 50%; the grass strip controls the runoff velocity on the slope and effectively inhibits the recovery of runoff velocity; in addition, the grass strip can reasonably control the sediment content of runoff, further reducing the runoff erosion intensity, so the soil and water loss control effect is optimal in the experimental scope; the runoff velocity decreases to its minimum and then increases with the gradual decrease in the distance between the grass strip and the slope top. There is a critical phenomenon in the hydrodynamic recovery space of runoff. When the hydrodynamic recovery distance is more than 54% of the slope length, the increase in runoff velocity is evident, the regulating effect of grass strip on runoff velocity weakens and the grass strip even aggravates the erosion; when the hydrodynamic recovery distance was less than 54% of the slope length, the decrease in runoff velocity was significant, the regulating effect of grass strip on runoff velocity enhances and the erosion intensity weakens. These research results can reveal that vegetation regulates soil erosion and sediment transport processes by the runoff retardation effect, and can provide reference bases for planning of soil and water conservation based on the vegetation measures.

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Last Update: 2021-04-20