Evaluating long-term patterns of decreasing groundwater discharge through a lake-bottom permeable reactive barrier

Journal of Environmental Management
Timothy D McCobbCarole D Johnson

Abstract

Identifying and quantifying groundwater exchange is critical when considering contaminant fate and transport at the groundwater/surface-water interface. In this paper, areally distributed temperature and point seepage measurements are used to efficiently assess spatial and temporal groundwater discharge patterns through a glacial-kettle lakebed area containing a zero-valent iron permeable reactive barrier (PRB). Concern was that the PRB was becoming less permeable with time owing to biogeochemical processes within the PRB. Patterns of groundwater discharge over an 8-year period were examined using fiber-optic distributed temperature sensing (FO-DTS) and snapshot-in-time point measurements of temperature. The resulting thermal maps show complex and uneven distributions of temperatures across the lakebed and highlight zones of rapid seepage near the shoreline and along the outer boundaries of the PRB. Repeated thermal mapping indicates an increase in lakebed temperatures over time at periods of similar stage and surface-water temperature. Flux rates in six seepage meters permanently installed on the lakebed in the PRB area decreased on average by 0.021 md-1 (or about 4.5 percent) annually between 2004 and 2015. Modeling of diurna...Continue Reading

References

Sep 19, 2003·Ground Water·Jim ConstantzGrace W Su
Oct 22, 2003·Journal of Contaminant Hydrology·W KamolpornwijitA B Sullivan
Feb 7, 2004·Ground Water·Donald O Rosenberry, Roger H Morin
Jul 21, 2005·Ground Water·Li LinElizabeth M Lawson
Dec 6, 2005·Ground Water·Mary P Anderson
Sep 16, 2015·Ground Water·Franklin W KochDale Werkema

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Citations

Jun 9, 2019·The Science of the Total Environment·Martin A BriggsJohn W Lane
Mar 23, 2021·Water Resources Research·R G FordR R Ross
Nov 16, 2021·Environmental Science. Processes & Impacts·Andrea K TokranovChad D Vecitis

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