Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges

doi:10.1002/ldr.2423

ISWC OpenIR > 水保所科研产出（EI） > 2015年EI

	Effects of Vegetation Stems on Hydraulics of Overland Flow Under Varying Water Discharges
	Chunhong Zhao 1,2; Jian’en Gao 1,3; Yuefei Huang 2; Guangqian Wang 2; Mengjie Zhang 1
文章类型	article
	2015
发表期刊	Land Degradation and Development
通讯作者邮箱	gaojianen@126.com
期号	0 页码:1-10
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 × 102 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 × 103 m3 s1 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.
关键词	Overland Flow Vegetation Stem Flow Regime Flow Velocity Hydraulic Resistance
DOI	10.1002/ldr.2423
URL	查看原文
收录类别	SCI ; EI
引用统计	被引频次：50[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/7736
专题	水保所科研产出（EI）_2015年EI
通讯作者	Jian’en Gao
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.