热门
Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges
文献类型：期刊论文
| 作者 | Chunhong Zhao1,2; Jian’en Gao1,3; Yuefei Huang2; Guangqian Wang2; Mengjie Zhang1 |
| 刊名 | Land Degradation and Development
 |
| 出版日期 | 2015 |
| 期号 | 0页码:1-10 |
| 通讯作者邮箱 | gaojianen@126.com |
| 关键词 | overland flow vegetation stem flow regime flow velocity hydraulic resistance |
| 通讯作者 | Jian’en Gao |
| 英文摘要 | Vegetation plays an important role in soil erosion control, but few studies have been performed to quantify the effects of vegetation stems on hydraulics of overland flow. Laboratory flume experiments were conducted to investigate the potential effects of vegetation stems on Reynolds number, Froude number, flow velocity and hydraulic resistance of silt-laden overland flow. Cylinders with diameter D of 2·0, 3·2 and 4·0 × 10 2 m were glued onto the flume bed to simulate the vegetation stems, and a bare slope was used as control. The flow discharge varied from 0·5 to 1·5 × 10 3 m3 s 1 and slope gradient was 9°. Results showed that Reynolds number on vegetated slope was significantly higher than that on bare slope because of the effect of vegetation stems on effective flow width. All the flows were supercritical flow, but Froude number decreased as D increased, implying a decrease in runoff ability to carry sediment. The mean flow velocity also decreased with D,while the velocity profile became steeper, and no significant differences were found in surface flow velocities among longitudinal sections on all slopes. Darcy–Weisbach friction coefficient increased with D, implying that the energy consumption of overland flow on hydraulic resistance increased. Reynolds number was not a unique predictor of hydraulic roughness on vegetated slopes. The total resistance on vegetated slopes was partitioned into grain resistance and vegetation resistance, and vegetation resistance accounted for almost 80% of the total resistance and was the dominant roughness element. Further studies are needed to extend and apply the insights obtained under controlled conditions to actual overland flow conditions. |
| 收录类别 | EI |
| 原文出处 | https://www.engineeringvillage.com/search/results/quick.url?CID=quickSearchCitationFormat&database=1&SEARCHID=d236199aM5c89M4da8M9dacMf39c84603280&intialSearch=true |
| 源URL | [http://ir.iswc.ac.cn/handle/361005/7736]  |
| 专题 | 水土保持研究所_水保所科研产出（EI）_2015年EI |
| 作者单位 | 1.Northwest A&F University, Yangling 712100, China 2.State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 3.Institute of Soil and Water Conservation, CAS&MWR, Yangling 712100, PR China |
| 推荐引用方式 GB/T 7714 | Chunhong Zhao,Jian’en Gao,Yuefei Huang,et al. Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges[J]. Land Degradation and Development,2015(0):1-10. |
| APA | Chunhong Zhao,Jian’en Gao,Yuefei Huang,Guangqian Wang,&Mengjie Zhang.(2015).Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges.Land Degradation and Development(0),1-10. |
| MLA | Chunhong Zhao,et al."Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges".Land Degradation and Development .0(2015):1-10. |
入库方式： OAI收割
来源：水土保持研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。