干旱区生态环境知识资源中心(Arid): Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow

Arid

DOI	10.1002/hyp.14705
	Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow
	Cen, Youdong; Zhang, Kuandi; Peng, Yong; Rubinato, Matteo; Liu, Juanjuan; Ling, Peng
通讯作者	Peng, Y
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2022
卷号	36 期号:10
英文摘要	Vegetation plays a significant role in preventing desertification, conservation of soil and water. However, nowadays, there is still uncertainty regarding the mechanisms of flow resistance caused by dissimilar vegetation covers. To address this gap, a series of these was conducted in this study to investigate the influence of synthetic grass and stems on the variation of resistance on overland flows. Thirty vegetation configurations were selected (combining five synthetic grass coverage options and six synthetic stem coverage ones), and tested against five unit discharges (flow range = 0.28-2.22 L m(-1) s(-1)) and four slope gradients (3.49%-20.78%). The results obtained showed that the unit discharge is the key driving factor for the transition from laminar to transitional flow. Furthermore, the relationship between the resistance coefficient (f) and the Reynolds number (Re) was not monotonically increasing or decreasing, but behaviours observed were specifically linked to each vegetation coverage. However, a critical coverage threshold was identified, and it corresponded to 2.72% when the slope gradient tested was 3.49%. This threshold decreased with the increase of the slope gradient. In addition, when the vegetation coverage was less than the critical threshold, the f was negatively correlated with Re, otherwise if the vegetation coverage was higher than the critical threshold identified the f-Re relation was positively correlated. The total flow resistance under synthetic grass and stem cover was unequal to the linear superposition of grain resistance and form resistance caused by synthetic stem and grass, which meant that the linear superposition approach is not applicable to overland flows. Finally, a model was developed to predict the flow resistance by applying the pi-theorem and the multiple nonlinear regression analysis and it has been validated against the experimental results confirming its accuracy and high performance (adj.R-2 = 0.99, NSE = 0.94).
英文关键词	flow regime grass and stem cover overland flow resistance coefficient Pi-theorem
类型	Article
语种	英语
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000865304200001
WOS关键词	VARYING SLOPE GRADIENTS ; RIGID VEGETATION ; HYDRAULIC CHARACTERISTICS ; EROSION ; SEDIMENT ; EQUATIONS ; RUNOFF
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393056
推荐引用方式 GB/T 7714	Cen, Youdong,Zhang, Kuandi,Peng, Yong,et al. Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow[J],2022,36(10).
APA	Cen, Youdong,Zhang, Kuandi,Peng, Yong,Rubinato, Matteo,Liu, Juanjuan,&Ling, Peng.(2022).Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow.HYDROLOGICAL PROCESSES,36(10).
MLA	Cen, Youdong,et al."Experimental study on the effect of simulated grass and stem coverage on resistance coefficient of overland flow".HYDROLOGICAL PROCESSES 36.10(2022).