干旱区生态环境知识资源中心(Arid): Rainfall intensity affects runoff responses in a semi-arid catchment

Arid

DOI	10.1002/hyp.14100
	Rainfall intensity affects runoff responses in a semi-arid catchment
	Tao, Ze; Li, Min; Si, Bingcheng; Pratt, Dyan
通讯作者	Li, M ; Si, BC (corresponding author), Northwest A&F Univ, Minist Educ, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Yangling 712100, Shaanxi, Peoples R China.
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2021
卷号	35 期号:4
英文摘要	The source and hydrochemical makeup of a stream reflects the connectivity between rainfall, groundwater, the stream, and is reflected to water quantity and quality of the catchment. However, in a semi-arid, thick, loess covered catchment, temporal variation of stream source and event associated behaviours are lesser known. Thus, the isotopic and chemical hydrographs in a widely distributed, deep loess, semi-arid catchment of the northern Chinese Loess Plateau were characterized to determine the source and hydrochemical behaviours of the stream during intra-rainfall events. Rainfall and streamflow were sampled during six hydrologic events coupled with measurements of stream baseflow and groundwater. The deuterium isotope (H-2), major ions (Cl-, SO42-, NO3-, Ca2+, K+, Mg2+, and Na+) were evaluated in water samples obtained during rainfall events. Temporal variation of H-2 and Cl- measured in the groundwater and stream baseflow prior to rainfall was similar; however, the isotope compositions of the streamflow fluctuated significantly and responded quickly to rainfall events, likely due to an infiltration excess, overland dominated surface runoff during torrential rainfall events. Time source separation using H-2 demonstrated greater than 72% on average, the stream composition was event water during torrential rainfall events, with the proportion increasing with rainfall intensity. Solutes concentrations in the stream had loglinear relationships with stream discharge, with an outling anomaly with an example of an intra-rainfall event on Oct. 24, 2015. Stream Cl- behaved nonconservative during rainfall events, temporal variation of Cl- indicated a flush and washout at the onset of small rainfall events, a dilution but still high concentration pattern in high discharge and old water dominated in regression flow period. This study indicates rainfall intensity affects runoff responses in a semi-arid catchment, and the stored water in the thick, loess covered areas was less connected with stream runoff. Solute transport may threaten water quality in the area, requiring further analysis of the performance of the eco-restoration project.
英文关键词	China hydrograph separation infiltration excess overland flow isotope tracer loess runoff semi‐ arid
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000645220700009
WOS关键词	CONCENTRATION-DISCHARGE RELATIONSHIPS ; LOESS PLATEAU ; STORM RUNOFF ; LAND-USE ; TIME DISTRIBUTIONS ; STABLE-ISOTOPE ; SOIL-EROSION ; WATER ; HYDROGRAPH ; FLOW
WOS类目	Water Resources
WOS研究方向	Water Resources
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368867
作者单位	[Tao, Ze; Li, Min; Si, Bingcheng] Northwest A&F Univ, Minist Educ, Key Lab Agr Soil & Water Engn Arid & Semiarid Are, Yangling 712100, Shaanxi, Peoples R China; [Si, Bingcheng] Univ Saskatchewan, Dept Soil Sci, Saskatoon, SK, Canada; [Si, Bingcheng] Ludong Univ, Yantai Key Lab Ecohydrol Proc & Environm Secur, Yantai, Peoples R China; [Pratt, Dyan] Univ Saskatchewan, Global Inst Water Secur, Sch Environm & Sustainabil, Saskatoon, SK, Canada
推荐引用方式 GB/T 7714	Tao, Ze,Li, Min,Si, Bingcheng,et al. Rainfall intensity affects runoff responses in a semi-arid catchment[J]. 西北农林科技大学,2021,35(4).
APA	Tao, Ze,Li, Min,Si, Bingcheng,&Pratt, Dyan.(2021).Rainfall intensity affects runoff responses in a semi-arid catchment.HYDROLOGICAL PROCESSES,35(4).
MLA	Tao, Ze,et al."Rainfall intensity affects runoff responses in a semi-arid catchment".HYDROLOGICAL PROCESSES 35.4(2021).