Aquatic Sciences

, Volume 78, Issue 2, pp 203–213 | Cite as

Heat-based hyporheic flux calculations in heterogeneous salmon spawning gravels

  • Christian Birkel
  • Chris Soulsby
  • Dylan J. Irvine
  • Iain Malcolm
  • Laura K. Lautz
  • Doerthe Tetzlaff
Research Article


Groundwater-surface water interactions in rivers are a critically important factor for fish spawning, as streamwater downwelling or upwelling of low-oxygen groundwater can affect egg survival. Assessing such dynamics at the reach scale using distributed temperature measurements as a tracer proved reliable in determining flux rates and directions in the hyporheic zone in a number of studies. Here, we report heat-based vertical flux rates from a heterogeneous gravel-bed stream reach used by spawning Atlantic salmon in the Scottish Highlands. Results showed mostly small downwelling fluxes (~0.3 m d−1), which were largely independent of discharge. Contrasting, and at times unusual flux-depth profiles (e.g., increasing flux with depth) were detected, consistent with the heterogeneous streambed material causing diverse hyporheic flow paths. This was tested in a numerical 2-D model setup attempting to reproduce such behavior with variable random hydraulic conductivity (K) fields. The 2-D model clearly demonstrated that strong deviations from the expected decrease of fluxes with depth can be explained by high heterogeneity coupled with relatively low K fields. This showed that using simple 1-D heat-based flux estimates in combination with 2-D models is a useful approach to testing hypotheses about the influence of variable streambed materials on groundwater–surface water exchange in an ecological context.


Hyporheic zone Heat tracer Ground water-surface water interaction VFLUX Numerical 2-D model 



We thank J. Grant for her efforts in the field collecting the data used in this study. Auxiliary data provided by Marine Sciences Scotland, Freshwater Laboratory and the Scottish Environmental Protection Agency. Dylan Irvine and Laura Lautz were supported by the National Science Foundation under Grant No. EAR–0901480.


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Copyright information

© Springer Basel 2015

Authors and Affiliations

  • Christian Birkel
    • 1
    • 4
  • Chris Soulsby
    • 1
  • Dylan J. Irvine
    • 3
  • Iain Malcolm
    • 2
  • Laura K. Lautz
    • 3
  • Doerthe Tetzlaff
    • 1
  1. 1.Northern Rivers InstituteUniversity of AberdeenAberdeenUK
  2. 2.Freshwater LaboratoryMarine Science ScotlandPitlochryUK
  3. 3.Department of Earth SciencesSyracuse UniversitySyracuseUSA
  4. 4.Department of GeographyUniversity of Costa RicaSan JoséCosta Rica

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