Spectral Analysis of Pumping Response in Observation Water Wells

Details Spectral Analysis of Pumping Response in Observation Water Wells Spectral Analysis of Pumping Response in Observation Water Wells

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.h33d1613v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #H33D-1613

Physics

1828 Groundwater Hydraulics, 1829 Groundwater Hydrology, 1872 Time Series Analysis (3270, 4277, 4475), 3255 Spectral Analysis (3205, 3280), 3280 Wavelet Transform (3255, 4455)

Scientific paper

During a constant rate discharge test a well is pumped for a period of time and the resulting hydrograph is used to estimate aquifer properties. In cases where the pumping effect is expected to be within the range of background noise it can be difficult to determine whether pumping has had an effect. We examine a sample of hydrographs from several wells in central Florida using an s-transform to identify periods of pumping response in overlying aquifers as compared to pumped aquifers. A series of synthetic drawdowns are superimposed on the hydrograph of a surficial aquifer monitor well where no pumping exists to examine the viability of this method. The spectral analysis results identify pumping response signals as well as natural signals inherent in groundwater data such as lunar cycles and daily fluctuations. An investigation of these natural signals in 14- years of hourly data is also presented to evaluate common groundwater frequencies ranging from daily to decadal. This investigation affirms the utility of spectral methods for identifying small scale responses embedded in aquifer test hydrographs.

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