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Measuring flow velocity on frozen and non-frozen slopes of black soil through leading edge method

International Soil and Water Conservation Research 2017年第3期5卷 180-189页

作者： Chao Chen Yunyun Ban Xuefeng Wang Tingwu Lei College of Water Resources and Civil Engineering China Agricultural UniversityQinghua DongluBeijing100083PR China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Science and Ministry of Water ResourcesYanglingShaanxi Province 712100PR China

Flow velocity is a major parameter related to hillslope hydrodynamics *** study aims to measure flow velocity over frozen and non-frozen slopes through leading edge method before being calibrated with accurate flow velocity to determine the correct coefficient for convenience of flow velocity *** experiments were conducted on frozen and non-frozen soil slopes with flumes involving four slope gradients of 5°,10°,15°,and 20°and three flow rates of 1,2,and 4 L/min with a flume of 6 m long and 0.1 m *** measurements were made with a stopwatch to record the time duration that the water flow ran over the rill segments of 2,4 and 6 m *** flow velocity was measured with electrolyte trace method,under pulse boundary *** leading edge and accurate flow velocities were used to determine the correction coefficient to convert the former to the *** showed that the correction coefficient on frozen soil slope was 0.81 with a coefficient of determination(R2)of *** correction coefficient on non-frozen soil slope was 0.79 with R2 of 0.98.A coefficient of 0.8 was applicable to both soil surface *** accurate velocities on the four frozen black soil slopes were approximately 30%,54%,71%,and 91%higher than those on non-frozen soil *** contrast,the leading edge flow velocities on the frozen soil slopes were 23%,54%,67%,and 84%higher than those on non-frozen soil *** flow velocities on frozen soil slopes increased with flow rate at all four slopes,but they increased from 5 to 15°before getting ***,rill flow velocity can be effectively measured with leading edge method by multiplying the leading edge velocity with a correction coefficient of *** study provides a strategy to measure rill flow velocity for studies on soil erosion mechanisms.

关键词： Flow velocity leading edge method Frozen/non-frozen soil

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