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[1]LIN Junqiu,YANG Daming,FANG Nufang,et al.Variation of Hydrodynamic Characteristics in the Process of Rill Erosion on the Slope[J].Research of Soil and Water Conservation,2022,29(01):1-7.

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Variation of Hydrodynamic Characteristics in the Process of Rill Erosion on the Slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 1-7 Column: Public date: 2022-02-20

Title:: Variation of Hydrodynamic Characteristics in the Process of Rill Erosion on the Slope

Author(s):: LIN Junqiu¹, YANG Daming², FANG Nufang^1,2, SHI Zhihua^2,3; (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; 3.College of Resources & Environment, Huazhong Agricultural University, Wuhan 430070, China)

Keywords:: Lou soil; rill; scour; soil erosion; hydrodynamic characteristics

CLC:: S157.1

DOI:: -

Abstract:: This study aims to quantitatively study the hydrodynamic characteristics of rill flow. Three different flow discharges(2 L/min, 4 L/min, 8 L/min)and five slope gradients(5°, 10°, 15°, 20°, 25°)of controlled slope experiments were conducted. The results show that the average velocity decreases with the increase of scoring duration and the development of rill morphology; the runoff depth increases with the increase of scouring duration. The Reynolds number varies from 237 to 1 090. At the large flow discharge, the Reynolds number decreases with the increase of scouring duration; by contrast, the small flow capacity increases. During the whole scouring process, the Froude number keeps greater than 1, indicating that the overland flow belongs to the category of jet stream. Darcy resistance coefficient of the slope rill flow increases with the continuously scouring, while the Froude number decreases with the increase of the Darcy-Weisbach resistance coefficient. A negative power function relationship is found between the resistance coefficient and the Froude number.

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Last Update: 2022-02-20