北京林业大学学报Issue(5)：94-98,5.DOI:10.13332/j.cnki.jbfu.2014.05.014
模拟降雨条件下黑麦草覆盖度对褐土坡面径流流速的影响
Effects of ryegrass coverage on runoff velocity of cinnamon soil slope under simulated rainfall
摘要
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 (θ) and rainfall intensity(R),when the coverage is ≤60%, V=47. 75(1 -C)0.27(sinθ)0.13R0.56(R2 =0. 97);when the coverage is >60%, V=24. 15(1-C)0.13(sinθ) -0.01R0.49 (R2 =0. 98). The correlation of the equations is significant respectively.关键词
模拟降雨/流速/草覆盖度/拟合方程Key words
simulated rainfall/flow velocity/grass coverage/fitting equation分类
农业科技引用本文复制引用
李瀚之,余新晓,樊登星,孙佳美,常玉,梁洪儒..模拟降雨条件下黑麦草覆盖度对褐土坡面径流流速的影响[J].北京林业大学学报,2014,(5):94-98,5.基金项目
国家自然科学基金项目(41171028)。 （41171028）
