Journal
FRESHWATER SCIENCE
Volume 34, Issue 1, Pages 99-110Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/679757
Keywords
proglacial groundwater; groundwater-surface-water exchange; Fiber-Optic Distributed Temperature Sensing; seepage flux; glacial retreat; ecohydrology; Iceland
Categories
Funding
- Royal Geographical Society [PRA 26.12]
- Institute of British Geographers (RGS-IBG) [PRA 26.12]
- Research Institute for the Environment, Physical Sciences and Applied Mathematics (EPSAM) at Keele University
- Directorate For Geosciences
- Division Of Earth Sciences [1440596, 1128999, 1129003, 1440506] Funding Source: National Science Foundation
Ask authors/readers for more resources
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 Skaftafellsjokull, 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available