不同宽度冲刷槽对崩岗崩积体产流产沙的影响

发布时间：2018-04-20 21:30

本文选题：冲刷 + 沙　；参考：《农业工程学报》2016年09期

【摘要】：为了解不同宽度冲刷槽对坡面冲刷侵蚀过程中产流产沙的影响,该研究以崩岗崩积体为对象,通过不同冲刷槽宽度(10、20、30、40、50 cm)和不同单宽流量(1.2×10-2、2.4×10-2、3.6×10-2、4.8×10-2 m2/min)相结合的室内模拟冲刷试验,研究不同宽度冲刷槽对崩积体产流产沙的影响。结果表明:1)单宽流量为1.2×10-2,2.4×10-2,3.6×10-2 m2/min时,不同冲刷槽宽度之间径流率、产沙率存在显著差异(P0.05);单宽流量为4.8×10-2 m2/min时,不同冲刷槽宽度之间径流率、产沙率差异不显著。2)单宽流量一定,不同冲刷槽宽度下径流率随时间变化趋势相同;单宽流量为1.2×10-2 m2/min时,不同冲刷槽宽度条件下产沙率和含沙量随时间变化趋势不同,其他单宽流量下产沙率和含沙量随时间变化趋势相同。3)单宽流量相同,不同冲刷槽宽度下累积径流量差异不显著;单宽流量为1.2×10-2,2.4×10-2,3.6×10-2 m2/min条件下,不同冲刷槽宽度下累积产沙量和平均含沙量差异显著(P0.05)。该研究揭示了冲刷槽宽度对崩积体产流产沙的影响,为今后试验冲刷槽宽度的选择提供参考。
[Abstract]:In order to understand the effect of different width scour grooves on runoff and sediment yield during erosion erosion on slope surface, an indoor simulated scour experiment was carried out with the combination of different erosion channel widths (1020 / 30 ~ 4050 cm) and a single wide flow rate (1.2 脳 10 ~ (-2) (2.4 脳 10 ~ (-2)) 脳 10 ~ (-2) 路m ~ (-2) 路m ~ (-2) 路m ~ (2 / min). The effect of different width scour grooves on sediment yield of avalanche was studied. The results show that there are significant differences in runoff rate and sediment yield rate between different flushing channel widths when the single width discharge is 1.2 脳 10 ~ (-2) ~ (-2) and 2.4 脳 10 ~ (-2) ~ (-2) 脳 10 ~ (-2) m2/min, while there is no significant difference in runoff rate and sediment yield rate between different scour channel widths at a single wide flow rate of 4.8 脳 10 ~ (-2) m2/min, and there is no significant difference in sediment yield rate between different flushing channel widths at a single wide flow rate of 4.8 脳 10 ~ (-2) m2/min. The variation trend of runoff rate with time is the same under different scour channel width, and the variation trend of sediment yield and sediment content with time is different when the single width discharge is 1.2 脳 10 ~ (-2) m2/min. The variation trend of sediment yield and sediment content with time is the same. 3) single width discharge is the same, but there is no significant difference in cumulative runoff under different scour channel width, and under the condition of 1.2 脳 10 ~ (-2) C ~ (-2) ~ (-2) 脳 10 ~ (-2) ~ (-2) 脳 10 ~ (-2) ~ (-2) 脳 10 ~ (-2) m2/min. The difference of accumulative sediment yield and average sediment content under different scour channel width is significant (P 0.05). This study reveals the influence of the width of the scour trough on the sediment yield of the caving body and provides a reference for the selection of the width of the scour trough in the future test.
【作者单位】：福建农林大学资源与环境学院;
【基金】：国家自然科学基金项目(41001169,41571272) 国家科技支撑计划项目(2014BAD15B0303)
【分类号】：S157.1

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