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[1]Huang Jun,Jin Pingwei,Jiang Xuebing.Study on the Relationship Between Runoff Depth, Erosion Yield and Catchment Area, Slope and Rainfall[J].Research of Soil and Water Conservation,2024,31(03):135-142.[doi:10.13869/j.cnki.rswc.2024.03.033]

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Study on the Relationship Between Runoff Depth, Erosion Yield and Catchment Area, Slope and Rainfall

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 135-142 Column: Public date: 2024-04-30

Title:: Study on the Relationship Between Runoff Depth, Erosion Yield and Catchment Area, Slope and Rainfall

Author(s):: Huang Jun^1,2, Jin Pingwei^1,2, Jiang Xuebing^1,2; (1.Pearl River Water Resources Research Institute, Guangzhou 510611, China; 2.Soil and Water Conservation Monitoring Center of Pearl River Basin, Guangzhou 510611, China)

Keywords:: catchment area; slope; runoff depth; soil loss

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2024.03.033

Abstract:: [Objective] The aims of this study are to analyze the quantitative relationship between runoff depth, soil erosion, and factors such as catchment area and slope, to provide a scientific basis for the construction of physical models of soil erosion and the calibration of their parameters. [Methods] Based on measured field data of natural rainfall on runoff plots under different surface conditions, a multiple parameters nonlinear estimation model for annual rainfall runoff depth and soil erosion was established. [Results] The threshold of rainfall generating runoff initially decreased and then increased with the catchment area and slope before showing a trend of increasing followed by decreasing. The annual runoff depth(Y₁)and annual soil loss(Y₂)showed a pattern of first increase and then decrease with the increase in area. Y₁ initially decreased and then rapidly increased with the slope while Y₂ continuously increased with the slope. Both Y₁ and Y₂ increased with the increase in annual rainfall. When the slope area increased to 130 square meters, both Y₁ and Y₂ reached to their maximum values. When the slope was 13.5 degrees, Y₁ reached to its minimum value. The multi-parameter nonlinear regression estimation model for Y₁ was highly accurate, with 70% of the data points having a relative error within±30%. [Conclusion] The interaction between catchment area, slope, and annual rainfall is the most significant in affecting annual rainfall runoff depth and erosion amounts. There exists a critical catchment area and a critical slope value for annual runoff depth and erosion amounts.

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Last Update: 2024-04-30