NDLI: Interpreting spatial patterns in redox and coupled water–nitrogen fluxes in the streambed of a gaining river reach

Content Provider	Springer Nature Link
Author	Heppell, Catherine Louise Heathwaite, A. Binley, Andrew Byrne, Patrick Ullah, Sami Lansdown, Katrina Keenan, Patrick Trimmer, Mark Zhang, Hao
Copyright Year	2013
Abstract	Water pathways through permeable riverbeds are multi-dimensional, including lateral hyporheic exchange flows as well as vertical (upwelling and downwelling) fluxes. The influence of different pathways of water on solute patterns and the supply of nitrate and other redox-sensitive chemical species in the riverbed is poorly understood but could be environmentally significant. For example, nitrate-rich upwelling water in the gaining reaches of groundwater-fed rivers has the potential to supply significant quantities of nitrate through the riverbed to surface waters, constraining opportunities to deliver the goals of the EU Water Framework Directive to achieve ‘good ecological status’. We show that patterns in porewater chemistry in the armoured river bed of a gaining reach (River Leith, Cumbria) reflect the spatial variability in different sources of water; oxic conditions being associated with preferential discharge from groundwater and reducing conditions with longitudinal and lateral fluxes of water due to water movement from riparian zones and/or hyporheic exchange flows. Our findings demonstrate the important control of both vertical and lateral water fluxes on patterns of redox-sensitive chemical species in the river bed. Furthermore, under stable, baseflow conditions (
Starting Page	491
Ending Page	509
Page Count	19
File Format	PDF
ISSN	01682563
Journal	Biogeochemistry
Volume Number	117
Issue Number	2-3
e-ISSN	1573515X
Language	English
Publisher	Springer International Publishing
Publisher Date	2013-08-04
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Hyporheic Nitrate Hydrological pathways Groundwater-fed Rivers Water quality Pollution Biogeosciences Ecosystems Environmental Chemistry Life Sciences
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Environmental Chemistry Water Science and Technology

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