Water sources and mixing in riparian wetlands revealed by tracers and geospatial analysis

Jason S. Lessels*, Doerthe Tetzlaff, Christian Birkel, Jonathan Dick, Chris Soulsby

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Mixing of waters within riparian zones has been identified as an important influence on runoff generation and water quality. Improved understanding of the controls on the spatial and temporal variability of water sources and how they mix in riparian zones is therefore of both fundamental and applied interest. In this study, we have combined topographic indices derived from a high-resolution Digital Elevation Model (DEM) with repeated spatially high-resolution synoptic sampling of multiple tracers to investigate such dynamics of source water mixing. We use geostatistics to estimate concentrations of three different tracers (deuterium, alkalinity, and dissolved organic carbon) across an extended riparian zone in a headwater catchment in NE Scotland, to identify spatial and temporal influences on mixing of source waters. The various biogeochemical tracers and stable isotopes helped constrain the sources of runoff and their temporal dynamics. Results show that spatial variability in all three tracers was evident in all sampling campaigns, but more pronounced in warmer dryer periods. The extent of mixing areas within the riparian area reflected strong hydroclimatic controls and showed large degrees of expansion and contraction that was not strongly related to topographic indices. The integrated approach of using multiple tracers, geospatial statistics, and topographic analysis allowed us to classify three main riparian source areas and mixing zones. This study underlines the importance of the riparian zones for mixing soil water and groundwater and introduces a novel approach how this mixing can be quantified and the effect on the downstream chemistry be assessed.

Original languageEnglish
Pages (from-to)456-470
Number of pages15
JournalWater Resources Research
Volume52
Issue number1
Early online date28 Jan 2016
DOIs
Publication statusPublished - Jan 2016

Fingerprint

tracer
wetland
riparian zone
water
runoff
geostatistics
sampling
deuterium
analysis
integrated approach
headwater
contraction
alkalinity
dissolved organic carbon
digital elevation model
stable isotope
soil water
catchment
water quality
groundwater

Keywords

  • biogeochemistry
  • geostatistics
  • synoptic sampling
  • tracer

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Water sources and mixing in riparian wetlands revealed by tracers and geospatial analysis. / Lessels, Jason S.; Tetzlaff, Doerthe; Birkel, Christian; Dick, Jonathan; Soulsby, Chris.

In: Water Resources Research, Vol. 52, No. 1, 01.2016, p. 456-470.

Research output: Contribution to journalArticle

Lessels, Jason S. ; Tetzlaff, Doerthe ; Birkel, Christian ; Dick, Jonathan ; Soulsby, Chris. / Water sources and mixing in riparian wetlands revealed by tracers and geospatial analysis. In: Water Resources Research. 2016 ; Vol. 52, No. 1. pp. 456-470.
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abstract = "Mixing of waters within riparian zones has been identified as an important influence on runoff generation and water quality. Improved understanding of the controls on the spatial and temporal variability of water sources and how they mix in riparian zones is therefore of both fundamental and applied interest. In this study, we have combined topographic indices derived from a high-resolution Digital Elevation Model (DEM) with repeated spatially high-resolution synoptic sampling of multiple tracers to investigate such dynamics of source water mixing. We use geostatistics to estimate concentrations of three different tracers (deuterium, alkalinity, and dissolved organic carbon) across an extended riparian zone in a headwater catchment in NE Scotland, to identify spatial and temporal influences on mixing of source waters. The various biogeochemical tracers and stable isotopes helped constrain the sources of runoff and their temporal dynamics. Results show that spatial variability in all three tracers was evident in all sampling campaigns, but more pronounced in warmer dryer periods. The extent of mixing areas within the riparian area reflected strong hydroclimatic controls and showed large degrees of expansion and contraction that was not strongly related to topographic indices. The integrated approach of using multiple tracers, geospatial statistics, and topographic analysis allowed us to classify three main riparian source areas and mixing zones. This study underlines the importance of the riparian zones for mixing soil water and groundwater and introduces a novel approach how this mixing can be quantified and the effect on the downstream chemistry be assessed.",
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N1 - Acknowledgments We thank the European Research Council (ERC) (project GA 335910 VEWA) and Natural Environment Research Council (NERC) (project NE/K000268/1) for funding and the Airborne Research and Survey Facility for conducting the aerial survey. The data used are available from the authors. In addition, we would like to thank the additional support from Audrey Innes for the sample analysis and Maria Blumstock and Mike Kennedy for assisting with field work.

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