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Discussion papers | Copyright
https://doi.org/10.5194/hess-2018-268
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Review article 30 May 2018

Review article | 30 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Hydrology and Earth System Sciences (HESS).

Toward a conceptual framework of hyporheic exchange across spatial scales

Chiara Magliozzi1, Robert Grabowski1, Aaron I. Packman2, and Stefan Krause3 Chiara Magliozzi et al.
  • 1Cranfield Water Science Institute, Cranfield University, Cranfield, MK43 0AL, UK
  • 2Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois, USA
  • 3School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

Abstract. Rivers are not isolated systems but interact continuously with groundwater from their confined headwaters to their wide lowland floodplains. In the last few decades, research on the hyporheic zone (HZ) has increased appreciation of the hydrological importance and ecological significance of connected river and groundwater systems. While recent studies have investigated hydrological, biogeochemical and ecohydrological processes in the HZ at bedform and reach scales, a comprehensive understanding of process-based interactions between factors operating at different spatial and temporal scales driving hyporheic exchange flows (HEF) at large and reach scale is still missing. Therefore, this review summarizes the factors and processes at catchment, valley and reach scales that interact and control spatial and temporal variations in hyporheic exchange flows. By using a multi-scale perspective, this review connects field observations and modelling studies to identify process driving patterns and dynamics of HEF. Finally, the influence of process interactions over multiple spatial scales is illustrated in a case study, supported by new GIS analyses, which highlights the importance of valley scale factors to the expression of HEF at the reach scale. This conceptual framework will aid the development of approaches to interpret hyporheic exchange across scales, infer scaling relationships, and inform catchment management decisions.

Chiara Magliozzi et al.
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Chiara Magliozzi et al.
Chiara Magliozzi et al.
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Latest update: 17 Oct 2018
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Short summary
The hyporheic zone is the area below riverbeds where surface water and groundwater mix together. Hyporheic flow is linked to river processes and functions but research to date has not sufficiently addressed how factors drive hyporheic flow variations. This review critically presents the scale-specific processes and process interactions that control hyporheic flow variation and applies these findings to a case study showing how valley factors affect the expression of flows at the reach scale.
The hyporheic zone is the area below riverbeds where surface water and groundwater mix together....
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