干旱区生态环境知识资源中心(Arid): Estimating Surface Water Presence and Infiltration in Ephemeral to Intermittent Streams in the Southwestern US

Arid

DOI	10.3389/frwa.2020.572950
	Estimating Surface Water Presence and Infiltration in Ephemeral to Intermittent Streams in the Southwestern US
	Gallo, Erika L.; Meixner, Thomas; Lohse, Kathleen A.; Nicholas, Hillary
通讯作者	Lohse, KA (corresponding author), Idaho State Univ, Dept Biol Sci, Pocatello, ID 83209 USA.
来源期刊	FRONTIERS IN WATER
EISSN	2624-9375
出版年	2020
卷号	2
英文摘要	Streamflow in arid and semi-arid regions is predominantly temporary, an integral part of mountain block hydrology and of significant importance for groundwater recharge and biogeochemical processes. However, temporary streamflow regimes, especially ephemeral flow, remain poorly quantified. We use electrical resistance sensors and USGS stream gauge data in 15 southern Arizona streams spanning a climate gradient (mean annual precipitation from 160 to 750 mm) to quantify temporary streamflow as streamflow presence and water presence, which includes streamflow, ponding and soil moisture. We use stream channel sediment data to estimate saturated hydraulic conductivity and potential annual infiltration. Annual streamflow ranged 0.6-82.4% or 2-301 days; while water presence ranged from 2.6 to 82.4% or 10 to over 301 days, or 4-33 times longer than streamflow. We identified 5 statistically distinct flow regimes based on the annual percent streamflow and water presence: (1) dry-ephemeral, (2) wet-ephemeral, (3) dry-intermittent, (4) wet-intermittent, and (5) seasonally-intermittent. In contrast to our expectations, stream channel density was a better predictor of annual streamflow and water presence than annual rainfall alone. Whereas, the dry-ephemeral and wet-ephemeral flow regimes varied with seasonal precipitation, the dry-intermittent, wet intermittent and seasonally-intermittent flow regimes did not. These results coupled with the potential infiltration estimates indicate that streamflow at the driest sites occurs in response to rainfall and overland flow while groundwater discharge and vadose zone contributions enhance streamflow at the wetter sites. We suggest that on a short temporal scale, and with respect to water presence, wetter sites might be buffered better against shifts in the timing and distribution of precipitation in response to climate change. Flow regime classifications that include both stream flow and water presence, rather than on stream flow alone, may be important for predicting thresholds in ecological functions and refugia in these dryland systems.
英文关键词	ephemeral streamflow flow regime arid semi-arid stream hydrology surface water
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000659473000001
WOS关键词	VEGETATION ; RECHARGE ; CLASSIFICATION ; CHANNELS ; MOISTURE
WOS类目	Water Resources
WOS研究方向	Water Resources
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352579
作者单位	[Gallo, Erika L.; Meixner, Thomas; Nicholas, Hillary] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ USA; [Gallo, Erika L.; Lohse, Kathleen A.] Idaho State Univ, Dept Biol Sci, Pocatello, ID 83209 USA
推荐引用方式 GB/T 7714	Gallo, Erika L.,Meixner, Thomas,Lohse, Kathleen A.,et al. Estimating Surface Water Presence and Infiltration in Ephemeral to Intermittent Streams in the Southwestern US[J]. University of Arizona,2020,2.
APA	Gallo, Erika L.,Meixner, Thomas,Lohse, Kathleen A.,&Nicholas, Hillary.(2020).Estimating Surface Water Presence and Infiltration in Ephemeral to Intermittent Streams in the Southwestern US.FRONTIERS IN WATER,2.
MLA	Gallo, Erika L.,et al."Estimating Surface Water Presence and Infiltration in Ephemeral to Intermittent Streams in the Southwestern US".FRONTIERS IN WATER 2(2020).