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Record number 531535
Title Tracking the Subsurface Signal of Decadal Climate Warming to Quantify Vertical Groundwater Flow Rates
Author(s) Bense, V.F.; Kurylyk, B.L.
Source Geophysical Research Letters 44 (2017)24. - ISSN 0094-8276 - p. 12244 - 12253.
Department(s) Hydrology and Quantitative Water Management
Publication type Refereed Article in a scientific journal
Publication year 2017
Keyword(s) Climate warming - Groundwater tracer - Heat flow - Hydrogeology
Abstract Sustained ground surface warming on a decadal time scale leads to an inversion of thermal gradients in the upper tens of meters. The magnitude and direction of vertical groundwater flow should influence the propagation of this warming signal, but direct field observations of this phenomenon are rare. Comparison of temperature-depth profiles in boreholes in the Veluwe area, Netherlands, collected in 1978-1982 and 2016 provided such direct measurement. We used these repeated profiles to track the downward propagation rate of the depth at which the thermal gradient is zero. Numerical modeling of the migration of this thermal gradient "inflection point" yielded estimates of downward groundwater flow rates (0-0.24 m a-1) that generally concurred with known hydrogeological conditions in the area. We conclude that analysis of inflection point depths in temperature-depth profiles impacted by surface warming provides a largely untapped opportunity to inform sustainable groundwater management plans that rely on accurate estimates of long-term vertical groundwater fluxes.
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