坡面流,地表坡面水流汇集运动的过程。是径流形成的一个阶段。降雨落到地面时须经植物截留、下渗、填洼和蒸发过程。当包气带土壤含水量达到饱和时或降雨强度超过土壤表面的下渗能力时,剩余的水分就形成地面漫流。坡面漫流由许多时合时分的细小、分散水流组成,平整坡面或大暴雨时可绵延成片状流或沟状流。
...毕业设计_毕业设计论文网 关键词:坡面流; 地表糙度; 水力特性; 阻力系数; 流速 [gap=735]Key words: the ascent surface flows; earth's surface roughness; hydraulic power characteristics; resistance coeffic..
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The model (hf)/L=f((a(1-ε))/(ε3))u2 coulddepict the overland flow in the litters, there f’ was a undetermined coefficient, when the flowvelocity was very low, the Ergun equation f’=(4.17)/(Re’)+0.29 could depict the overland flow.
坡面流在枯落物中流动的数学模型,可用下述模型描述hf/L=f’(a(1-ε)_ε3)u2,其中包括一个未知的待定系数f’,在流速较低时,可用欧根(Ergun)方程描述:f’=4.17/Re+0.29。
参考来源 - 黄土地区森林植被对坡面土壤侵蚀过程影响机理研究On the base of overland flow theory, by one-dimension kinetic wave model, the formula for overland flow is deduced, which includes configuration and land feature in loess donga.4.
根据坡面流理论,运用一维运动波模型,推导出了考虑黄土沟壑区地形地貌条件的坡面产流公式。 4.根据地下水动力学原理,对现有渗沟埋置深度的确定公式进行了分析评价,从路基正常工作状态出发,提出了考虑荷载作用深度及超高影响的单渗沟、双渗沟埋置深度计算公式。
参考来源 - 黄土沟壑区路基防排水技术研究·2,447,543篇论文数据,部分数据来源于NoteExpress
本文主要研究了基于FPGA的坡面流流速仪。
This paper mainly discussed the design of overland flow velocity detecting instrument based on FPGA.
草被覆盖是影响坡面流流速变化过程及特征的重要因素之一。
Grass coverage has great influence on the change of overland flow velocity.
而坡面流弗劳德数在整个试验过程中均大于1,属于急流范围。
The Froude number of runoff flow larger than 1 under the all experiments and it is belongs to the turbulent condition.
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