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[1]HUO Yunpei,ZHU Bingbing.Experimental Study on Impacts of Vegetation Patterns on Sediment Yield of Slope[J].Research of Soil and Water Conservation,2022,29(05):14-20.

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Experimental Study on Impacts of Vegetation Patterns on Sediment Yield of Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 05 Page number: 14-20 Column: Public date: 2022-08-20

Title:: Experimental Study on Impacts of Vegetation Patterns on Sediment Yield of Slope

Author(s):: HUO Yunpei¹, ZHU Bingbing²; (1.School of Ecnomics and Management, Shaanxi Xueqian Normal University, Xi'an 710100, China; 2 School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China)

Keywords:: slope; vegetation pattern; sediment yield; hydrodynamic parameters; unit stream power

CLC:: S157.1

DOI:: -

Abstract:: Understanding the changes of sediment yield and hydrodynamic parameters of slopes under different vegetation patterns is of great significance for revealing the hydrodynamic mechanism and establishing suitable vegetation parameters for indicating sediment processes. In this study, the variations of sediment yield and hydrodynamic parameters of slopes with different vegetation coverage(0,30%,50%,70%,90%)and positions(upslope, middle slope and downslope)of grasslands were analyzed by scouring test. The results show that, grass coverage, runoff kinetic energy, runoff velocity, Fr number, Darcy-Weisbach resistence coefficient, Manning's roughness coefficient and shear stress were closely related with sediment yield. With the increase of grass coverage, runoff velocity, shear stress, sediment yield, unit stream power and runoff kinetic energy decreased linearly, while Manning's roughness coefficient and Darcy-Weisbach consistence coefficient increased significantly. When the coverage reached to the range of 50%～70%, the increase of grass coverage couldn't stimulate high sediment yield reduction which meant the valid coverage was 50% and the threshold coverage was 70% in this study. With the increase of coverage, the impacts of grass position on the sediment yield show a general rule that the sediment yield on the slope with grass cover in middle and downslope is smaller than that in upslope. A simulation forum including coverage, unit stream power and runoff kinetic energy was established to predict sediment yield. The results can provide important theoretical basis for clarifying the threshold of grass coverage on sediment reduction and suitable position and implementing soil erosion countermeasures on the Loess Plateau, and for prompting high quality development of the Yellow River Basin.

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Last Update: 2022-08-20