干旱区生态环境知识资源中心(Arid): Influence of groundwater and topography on stream drying in semi-arid headwater streams

Arid

DOI	10.1002/hyp.14185
	Influence of groundwater and topography on stream drying in semi-arid headwater streams
	Warix, Sara R.; Godsey, Sarah E.; Lohse, Kathleen A.; Hale, Rebecca L.
通讯作者	Warix, SR (corresponding author), Colorado Sch Mines, Hydrol Sci & Engn, Golden, CO 80401 USA.
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2021
卷号	35 期号:5
英文摘要	Non-perennial streams comprise over half of the global stream network and impact downstream water quality. Although aridity is a primary driver of stream drying globally, surface flow permanence varies spatially and temporally within many headwater streams, suggesting that these complex drying patterns may be driven by topographic and subsurface factors. Indeed, these factors affect shallow groundwater flows in perennial systems, but there has been only limited characterisation of shallow groundwater residence times and groundwater contributions to intermittent streams. Here, we asked how groundwater residence times, shallow groundwater contributions to streamflow, and topography interact to control stream drying in headwater streams. We evaluated this overarching question in eight semi-arid headwater catchments based on surface flow observations during the low-flow period, coupled with tracer-based groundwater residence times. For one headwater catchment, we analysed stream drying during the seasonal flow recession and rewetting period using a sensor network that was interspersed between groundwater monitoring locations, and linked drying patterns to groundwater inputs and topography. We found a poor relationship between groundwater residence times and flowing network extent (R-2 < 0.24). Although groundwater residence times indicated that old groundwater was present in all headwater streams, surface drying also occurred in each of them, suggesting old, deep flowpaths are insufficient to sustain surface flows. Indeed, the timing of stream drying at any given point typically coincided with a decrease in the contribution from near-surface sources and an increased relative contribution of groundwater to streamflow at that location, whereas the spatial pattern of drying within the stream network typically correlated with locations where groundwater inputs were most seasonally variable. Topographic metrics only explained similar to 30% of the variability in seasonal flow permanence, and surprisingly, we found no correlation with seasonal drying and down-valley subsurface storage area. Because we found complex spatial patterns, future studies should pair dense spatial observations of subsurface properties, such as hydraulic conductivity and transmissivity, to observations of seasonal flow permanence.
英文关键词	groundwater groundwater residence time intermittent streams topography
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000655496700036
WOS关键词	COLORADO RIVER-BASIN ; HYDROGRAPH SEPARATION ; FLOW INTERMITTENCY ; TRANSIT TIMES ; BASEFLOW ; TRACER ; WATER ; SNOW ; CONDUCTIVITY ; CONNECTIVITY
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/2XILL650/368793
作者单位	[Warix, Sara R.; Godsey, Sarah E.; Lohse, Kathleen A.] Idaho State Univ, Dept Geosci, Pocatello, ID USA; [Lohse, Kathleen A.; Hale, Rebecca L.] Idaho State Univ, Dept Biol Sci, Pocatello, ID USA
推荐引用方式 GB/T 7714	Warix, Sara R.,Godsey, Sarah E.,Lohse, Kathleen A.,et al. Influence of groundwater and topography on stream drying in semi-arid headwater streams[J],2021,35(5).
APA	Warix, Sara R.,Godsey, Sarah E.,Lohse, Kathleen A.,&Hale, Rebecca L..(2021).Influence of groundwater and topography on stream drying in semi-arid headwater streams.HYDROLOGICAL PROCESSES,35(5).
MLA	Warix, Sara R.,et al."Influence of groundwater and topography on stream drying in semi-arid headwater streams".HYDROLOGICAL PROCESSES 35.5(2021).