Tristram, DA, Krause, S, Levy, A, Robinson, ZP ORCID: https://orcid.org/0000-0002-9499-264X, Waller, RI and Weatherill, JJ (2015) Identifying spatial and temporal dynamics of proglacial groundwater-surface-water exchange using combined temperature-tracing methods. Freshwater Science, 34 (1). 99 -110.

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Abstract

The effect of proglacial groundwater systems on surface hydrology and ecology in cold regions often is neglected when assessing the ecohydrological implications of climate change. We present a novel approach in which we combined 2 temperature-tracing techniques to assess the spatial patterns and short-term temporal dynamics of groundwater–surface-water exchange in the proglacial zone of Skaftafellsjökull, a retreating glacier in southeastern Iceland. Our study focuses on localized groundwater discharge to a surface-water environment, where high temporal- and spatial-resolution mapping of sediment surface and subsurface temperatures (10–15 cm depth) were obtained by Fiber-Optic Distributed Temperature Sensing (FO-DTS). The FO-DTS survey identified temporally consistent locations of temperature anomalies at the sediment–water interface, indicating distinct zones of cooler groundwater upwelling. The high-resolution FO-DTS surveys were combined with calculations of 1-dimensional groundwater seepage fluxes based on 3 vertical sediment temperature profiles, covering depths of 10, 25, and 40 cm below the lake bed. The calculated groundwater seepage rates ranged between 1.02 to 6.10 m/d. We used the combined techniques successfully to identify substantial temporal and spatial heterogeneities in groundwater–surface exchange fluxes that have relevance for the ecohydrological functioning of the investigated system and its potential resilience to environmental change.

Item Type: Article
Additional Information: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via University of Chicago Press Journals at http://dx.doi.org/10.1086/679757 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: proglacial groundwater, groundwater–surface-water exchange, Fiber-Optic Distributed Temperature Sensing, seepage flux, glacial retreat, ecohydrology, Iceland
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 15 Dec 2016 09:09
Last Modified: 08 May 2019 13:49
URI: http://eprints.keele.ac.uk/id/eprint/2666

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