Role of riparian wetlands and hydrological connectivity in the dynamics of stream thermal regimes

Jonathan J. Dick*, Doerthe Tetzlaff, Chris Soulsby

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Stream temperature is a fundamental physical characteristic of rivers, influencing biological productivity and water quality. Given the implications of climate warming for stream thermal regimes, it is an important consideration in river management plans. Energy exchanges at the water–air interface, channel geomorphology, riparian vegetation and advective heat transport from the different sources of discharge can all influence stream temperature. A simple mixing equation was used to investigate heat transport and to estimate daily mean and maximum stream temperatures on the basis of mixing groundwater and near-surface flows from riparian wetlands as end-members in a peatland catchment. The resulting data were evaluated against energy balance components and saturation extent to investigate the importance of riparian wetlands in determining stream temperatures. Data fit was generally good in periods with extensive saturation and poorest in dry periods with less hydrological connectivity, when reduced saturation and low flows increased the relative influence of energy exchange at the stream–atmosphere interface. These findings have implications in terms of climate change and land management, where the planting of riparian buffer strips to moderate water temperatures May be less effective when saturation area is extensive and hydrological connectivity is high.

Original languageEnglish
Pages (from-to)634-647
Number of pages14
JournalHydrology Research
Volume49
Issue number3
Early online date13 Nov 2017
DOIs
Publication statusPublished - 30 Jun 2018

Keywords

  • Mixing models
  • Peatlands
  • Riparian areas
  • Stream temperatures

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