摘要:
为研究褐土坡面径流流速受坡面黑麦草覆盖度的影响,在2 个雨强(0.5、1.0 mm/ min)和2 个坡度(10?、20?)
条件下人工模拟降雨,分析研究了5 个不同黑麦草覆盖度(0、20%、40%、60%、80%)对坡面径流流速的影响。结
果表明:坡面径流流速随降雨历时延长而增加,最后达到稳定流速。坡面流的稳定流速与雨强和坡度呈正相关,与
黑麦草覆盖度呈负相关。60%的坡面草覆盖度是一个拐点,高于此拐点时,坡面径流的流速差异较小,且坡度对流
速的影响不十分显著。以黑麦草覆盖度拐点为界,分2 段拟合了坡面流的稳定流速(V)与草覆盖度(C)、雨强(R)、
坡度()的方程:在草覆盖度臆60% 时,V = 47.75(1 - C)0.27 (sin)0.13 R0.56 (R2 = 0.97);在草覆盖度 60% 时,V =
24.15(1 - C)0.13 (sin) -0.01 R0.49 (R2 =0.98),2 段统计关系相关性十分显著。
关键词:
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模拟降雨
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流速
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草覆盖度
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拟合方程
Abstract:
To understand the effects of ryegrass coverage on flow velocity at cinnamon soil slope, we analyzed
the effects of five different ryegrass coverage (0,20%,40%,60%,80%,respectively) on flow velocity
under the condition of artificial rainfall, conducted by two rainfall intensities(0.5,1 mm/ min) and two
slopes(10?, 20?) respectively. The results showed that flow velocity had positive correlation with rainfall
duration until reach the stable. Meanwhile, there were positive correlations between stable flow velocity
and rainfall intensity as well as slope, while negative correlation between stable flow velocity and coverage
of ryegrass grass. When the coverage of ryegrass exceeded 60%, the differences in flow velocity at
different conditions declined and the influence of slope on flow velocity was insignificant. Hence, based
on the threshold, we simulated the equation into two parts, given by flow velocity (V), coverage of
sloping grass(C), slope () and rainfall intensity(R),when the coverage is 60%, V = 47.75(1 -
C)0.27(sin)0.13 R 0.56(R2 =0.97); when the coverage is 60%, V =24.15(1 - C)0.13 (sin) -0.01 R0.49
(R2 =0.98). The correlation of the equations is significant respectively.
百度学术
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