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[1]GOU Junfei,GAN Fengling,LIU Chunhong.Variation of Rill Morphology and Its Effect on Runoff and Sediment Yield on Purple Soil Slope[J].Research of Soil and Water Conservation,2023,30(05):61-68,75.[doi:10.13869/j.cnki.rswc.2023.05.013.]

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Variation of Rill Morphology and Its Effect on Runoff and Sediment Yield on Purple Soil Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 61-68,75 Column: Public date: 2023-08-10

Title:: Variation of Rill Morphology and Its Effect on Runoff and Sediment Yield on Purple Soil Slope

Author(s):: GOU Junfei^1,2, GAN Fengling^1,2, LIU Chunhong^1,2; (1.Chongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing Normal University, Chongqing 401331, China; 2.Chongqing Field Observation and Research Station of Surface Ecological Process in the Three Gorges Reservoir Area, Chongqing 401331, China)

Keywords:: rill morphology; runoff yield rate; sediment yield rate; rill erosion rate; flow discharge; slope length; purple soil slope

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.05.013.

Abstract:: [Objective] The aim of this study is to explore the influence of rill morphology characteristics to runoff and sediment yield on purple soil slope as well as the main controlling factors affecting runoff and sediment yield in rill, and then to provide a reference for soil erosion control in purple soil area. [Methods] Purple sloping farmland was taken as the research object. A series of the scouring-erosion experiments were conducted under the different slope length(1, 2, 3, 4 and 5 m)and flow discharge(6, 8 and 10 L/min). The scouring-erosion experiments were used to quantitatively analyze the variation of rill morphology and the characteristics of runoff and sediment yield, and the influence of rill morphology variation on the characteristics of runoff and sediment yield was discussed. [Results] With the increase of flow discharge, the rill width and rill depth increased, and the width-depth ratio decreased. With the increasing of slope length, the rill width and width-depth ratio showed the decrease-increase trend, while the rill depth showed the contrary tendency, and the rill morphology had a sudden change in the slope length of 3～4 m. Flow discharge was positively correlated with runoff yield rate, sediment yield rate and rill erosion rate. Slope length was positively correlated with sediment yield rate, but negatively correlated with runoff yield rate and rill erosion rate. Runoff yield rate was mainly affected by flow discharge, sediment yield rate and rill erosion rate were mainly affected by the interaction of flow discharge and slope length. Rill morphology had a weak relationship with the runoff(r=0.54, p< 0.05), and was closely related to the sediment yield(r > 0.67, p< 0.01). Through multiple stepwise regression analysis, it was found that rill width was the key factor affecting the rill erosion rate(p< 0.05), and rill depth was the key factor affecting sediment yield rate and cumulative sediment yield(p< 0.01). [Conclusion] Rill width and rill depth could be used to predict the erosion degree of purple soil slope, and rill depth could be considered as the best indicator to characterize the sediment yield. In the future, rill erosion control measures should focus on the control of development of rill depth.

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Last Update: 2023-08-10