Temporal scaling of groundwater level fluctuations near a stream

Ground Water
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Temporal scaling in stream discharge and hydraulic heads in riparian wells was evaluated to determine the feasibility of using spectral analysis to identify potential surface and groundwater interaction. In floodplains where groundwater levels respond rapidly to precipitation recharge, potential interaction is established if the hydraulic head (h) spectrum of riparian groundwater has a power spectral density similar to stream discharge (Q), exhibiting a characteristic breakpoint between high and low frequencies. At a field site in Walnut Creek watershed in central Iowa, spectral analysis of h in wells located 1 m from the channel edge showed a breakpoint in scaling very similar to the spectrum of Q (∼20 h), whereas h in wells located 20 and 40 m from the channel showed temporal scaling from 1 to 10,000 h without a well‐defined breakpoint. The spectral exponent (β) in the riparian zone decreased systematically from the channel into the floodplain as groundwater levels were increasingly dominated by white noise groundwater recharge. The scaling pattern of hydraulic head was not affected by land cover type, although the number of analyses was limited and site conditions were variable among sites. Spectral analysis would not replace quantitative tracer or modeling studies, but the method may provide a simple means of confirming potential interaction at some sites.

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Publication type Article
Publication Subtype Journal Article
Title Temporal scaling of groundwater level fluctuations near a stream
Series title Ground Water
DOI 10.1111/j.1745-6584.2011.00804.x
Volume 50
Issue 1
Year Published 2012
Language English
Publisher National Ground Water Association
Description 9 p.
First page 59
Last page 67
Country United States
State Iowa
County Jasper County
Other Geospatial Walnut Creek Watershed
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