干旱区生态环境知识资源中心(Arid): Hydrogeological controls on the flow regime of an ephemeral temperate stream flowing across an alluvial fan

Arid

DOI	10.1016/j.jhydrol.2021.125994
	Hydrogeological controls on the flow regime of an ephemeral temperate stream flowing across an alluvial fan
	Blackburn, Joel; Comte, Jean-Christophe; Foster, Gez; Gibbins, Christopher
通讯作者	Blackburn, J (corresponding author), Univ Aberdeen, Sch Geosci, Northern Rivers Inst NRI, Aberdeen, Scotland.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	595
英文摘要	Alluvial fans often support ephemeral streams whose flow regimes and sediment dynamics are strongly controlled by fan sedimentary characteristics and interactions with shallow groundwater aquifers. The hydrogeology of such fans has most often been documented for large fans located within arid climate zones. This research focuses on a small (0.075 km(2)) alluvial fan situated in a temperate, high rainfall climate (the Lake District, North West England). An ephemeral stream flowing across this alluvial fan plays a key role in supplying water and sediment to the River Ehen, which is the focus of a habitat restoration initiative. This study combines high spatial resolution, near surface geophysics and outcrop data with hydrological data to characterise the hydrogeological properties of the alluvial fan. A conceptual hydrogeological model was developed to understand the hydrology across the alluvial fan and how that affects water and sediment supply to the River Ehen. The alluvial fan is composed predominantly of permeable debris flow deposits and numerous palaeochannels which may provide preferential groundwater flow paths. During streamflows, partial to full stream-aquifer connectivity occurs, especially in the distal fan where groundwater discharges back into the stream. Streamflows occur when the fan apex infiltration rate/capacity threshold of approx. 60 l/s(-1) is exceeded, typically following rainfall events >9-11 mm. Understanding interactions between ephemeral streams and their underlying aquifers enables better predictions of the timing and magnitude of future flows, and in-turn, their likely impacts on the water courses into which they discharge.
英文关键词	Ephemeral stream Alluvial fan Hydrogeology Geophysics Hydrology Stream-aquifer interactions
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000641592600045
WOS关键词	GROUNDWATER RECHARGE ; SURFACE-WATER ; HYDRAULIC CONDUCTIVITY ; ARCHITECTURE ; INFILTRATION ; DYNAMICS ; AQUIFER
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368869
作者单位	[Blackburn, Joel; Comte, Jean-Christophe] Univ Aberdeen, Sch Geosci, Northern Rivers Inst NRI, Aberdeen, Scotland; [Foster, Gez] Environm Agcy, Penrith, Cumbria, England; [Gibbins, Christopher] Univ Nottingham, Sch Environm & Geog Sci, Malaysia Campus,Jalan Broga, Semenyih, Selangor, Malaysia
推荐引用方式 GB/T 7714	Blackburn, Joel,Comte, Jean-Christophe,Foster, Gez,et al. Hydrogeological controls on the flow regime of an ephemeral temperate stream flowing across an alluvial fan[J],2021,595.
APA	Blackburn, Joel,Comte, Jean-Christophe,Foster, Gez,&Gibbins, Christopher.(2021).Hydrogeological controls on the flow regime of an ephemeral temperate stream flowing across an alluvial fan.JOURNAL OF HYDROLOGY,595.
MLA	Blackburn, Joel,et al."Hydrogeological controls on the flow regime of an ephemeral temperate stream flowing across an alluvial fan".JOURNAL OF HYDROLOGY 595(2021).