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DOI	10.1016/j.ejrh.2021.100806
	Tracing sources of stormflow and groundwater recharge in an urban, semi-arid watershed using stable isotopes
	Wallace, Sierra; Biggs, Trent; Lai, Chun-Ta; McMillan, Hilary
通讯作者	McMillan, H (corresponding author), San Diego State Univ, Dept Geog, San Diego, CA 92182 USA.
来源期刊	JOURNAL OF HYDROLOGY-REGIONAL STUDIES
EISSN	2214-5818
出版年	2021
卷号	34
英文摘要	Study region: In this study, we use stable isotopes of water to quantify the flow pathways delivering water to the tributaries, mainstem river and groundwater basin underlying urban San Diego. Information about sources of stormflow and recharge are necessary to maintain the health of waterways and aquifers, but studies of these processes are scarce in urban, semi-arid regions. Study focus: Isotopic methods have been used in experimental or natural watersheds, but also have potential to quantify urban water cycling behaviour and water sources. We sampled baseflow, precipitation, and hourly stormflow from eight events with a range of antecedent conditions, and used end member mixing analysis to determine stormflow and groundwater sources. New hydrological insights for the region: Our results show that hydrologic connectivity controls stormflow sources. After a dry summer, and early in storm events, connectivity of pre-event water with the channel is low, so only new precipitation reaches the river. In wetter conditions, connectivity is higher and pre-event surface water mixes with infiltration-origin groundwater. Deeper groundwater composition mimics stormflow, a mix of stagnated river water and infiltration-origin water. The close connection between streamflow and groundwater implies that improving groundwater quality requires improvements to surface water quality. Average uncertainty in source fractions was +/- 8.0 %, suggesting that despite complex water pathways in urban, semi-arid environments, isotopic sampling is valuable for quantifying water sources.
英文关键词	Stable isotopes End member mixing analysis Urban Semi-arid Aquifer Watershed
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000635180700030
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/2XILL650/350914
作者单位	[Wallace, Sierra; Biggs, Trent; McMillan, Hilary] San Diego State Univ, Dept Geog, San Diego, CA 92182 USA; [Lai, Chun-Ta] San Diego State Univ, Dept Biol, San Diego, CA 92182 USA
推荐引用方式 GB/T 7714	Wallace, Sierra,Biggs, Trent,Lai, Chun-Ta,et al. Tracing sources of stormflow and groundwater recharge in an urban, semi-arid watershed using stable isotopes[J],2021,34.
APA	Wallace, Sierra,Biggs, Trent,Lai, Chun-Ta,&McMillan, Hilary.(2021).Tracing sources of stormflow and groundwater recharge in an urban, semi-arid watershed using stable isotopes.JOURNAL OF HYDROLOGY-REGIONAL STUDIES,34.
MLA	Wallace, Sierra,et al."Tracing sources of stormflow and groundwater recharge in an urban, semi-arid watershed using stable isotopes".JOURNAL OF HYDROLOGY-REGIONAL STUDIES 34(2021).