Peak flow rate response to vegetation and terraces under extreme rainstorms

doi:10.1016/j.agee.2019.106714

	Peak flow rate response to vegetation and terraces under extreme rainstorms
	Fu, Suhua 2,3; Yang, Yanfen 1; Liu, Baoyuan 2,3; Liu, Hanqi 1; Liu, Jiaxin 1; Liu, Liang 1; Li, Panpan 1
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2020-02-01
卷号	288 页码:7
关键词	Peak flow rate Soil and water conservation Extreme rainstorm Soil loess Loess Plateau
ISSN号	0167-8809
DOI	10.1016/j.agee.2019.106714
通讯作者	Yang, Yanfen(yfyang@ms.iswc.ac.cn)
英文摘要	Soil and water conservation measures such as vegetation cover and terraces effectively reduce runoff and sediment yield. However, there is little information available on how vegetation cover and terraces affect peak flow under extreme rainstorm conditions. The purpose of this study was to investigate the effect of vegetation cover and terraces on peak flow rate in small catchments under "7.26" extreme rainstorm conditions on the Chinese Loess Plateau. Thirty-two small watersheds located in Chabagou Watershed, Zizhou County, Shaanxi Province, were selected. The watershed areas ranged from 0.03 to 1.55 km(2). An aerial image with a resolution of 0.2 m was used to determine the land use and engineering practice by means of visual interpretation. The cross-section at the watershed outlets were investigated. At each cross-section, the flow depth, cross-sectional area of flow, wetted perimeter, and slope gradient of the channel were measured. Then, flow velocity was calculated using Manning's equation. Peak flow rate was calculated based on flow velocity and cross-sectional area of flow. The results showed that peak flow rates varied from 0.35 to 79.89 m(3)/s. Unit flood peak ranged from 4.3 to 153.0 m(3)/(km(2)center dot s). Peak flow rate was significantly correlated with watershed area, main channel length of the watershed, mean slope gradient of the watershed, and area percentage of the grassland at p < 0.01. The unit flood peak in the grassland and woodland decreased by 36% and 64%, respectively, compared with that in the watershed with the largest cropland component. Terraces reduced the unit flood peaks in the farmland and grassland by 48% and 39%, respectively. Thus, vegetation cover and terraces effectively reduced peak flow rate, and the susceptibility of the sampled watersheds to flood generation was evaluated as "average'' under extreme storm conditions. Our findings indicate that vegetation cover and terraces play an important role in soil conservation onsite and flood safety offsite under extreme rainstorm conditions.
资助项目	National Key Research and Development Program of China[2017YFD0800502] ; National Natural Science Foundation of China[41571259] ; CAS Light of West China Program
WOS关键词	SOIL PHYSICAL QUALITY ; WESTERN CASCADES ; FLASH FLOODS ; EROSION ; RUNOFF ; IMPACT ; CATCHMENT ; SEDIMENT ; RAINFALL ; WATER
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000500217500006
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; CAS Light of West China Program
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130539]
专题	中国科学院地理科学与资源研究所
通讯作者	Yang, Yanfen
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Fu, Suhua,Yang, Yanfen,Liu, Baoyuan,et al. Peak flow rate response to vegetation and terraces under extreme rainstorms[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2020,288:7.
APA	Fu, Suhua.,Yang, Yanfen.,Liu, Baoyuan.,Liu, Hanqi.,Liu, Jiaxin.,...&Li, Panpan.(2020).Peak flow rate response to vegetation and terraces under extreme rainstorms.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,288,7.
MLA	Fu, Suhua,et al."Peak flow rate response to vegetation and terraces under extreme rainstorms".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 288(2020):7.