Dynamic ice formation in channels as a driver for stream‐aquifer interactions. Issue 13 (12th July 2013)

• Record Type: Journal Article
• Authors: Weber, Matthew D.; Booth, Eric G.; Loheide, Steven P.
• Is Part Of: Geophysical research letters. Volume 40:Issue 13(2013:Jul.)
• Page Start: 3408
• Page End: 3412
• Publication Date: 2013-07-12
• Subjects: stream‐aquifer interactions -- hyporheic exchange -- dynamic ice formation -- diurnal fluctuations -- river ice; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/grl.50620
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: [1] This research introduces and provides evidence of a novel mechanism of stream‐aquifer exchange caused by dynamic ice formation on streams. At a stream site in southwestern Wisconsin, we document a significant fluctuation in stream depth and the potentiometric surface in the adjacent aquifer during periods of ice formation, suggesting that stream‐aquifer interactions may be influenced by these transient events. Four years of winter stream data document that dynamic ice formation (1) causes an average increase in stream depth of 106%, (2) affects stream depth on 20% of days from December through February, and (3) substantially alters stream‐aquifer interactions by reducing the hydraulic gradient toward the channel during ice formation events. Dynamic ice formation represents a potentially widespread mechanism for altering stream‐aquifer interactions and associated biogeochemical transformations. The sensitivity of this process to air temperature indicates a need for further research on the impacts of climate warming. Key Points: Dynamic ice formation causes fluctuating stream and aquifer water levels Ice formation is an unidentified mechanism altering stream‐aquifer interactions Dynamic ice formation alters stream‐aquifer interactions regularly during winter