Acworth, RI; Halloran, LJS; Rau, GC; Cuthbert, MO; Bernardi, TL; (2016) An objective frequency domain method for quantifying confined aquifer compressible storage using Earth and atmospheric tides. Geophysical Research Letters , 43 (22) 11,671-11,678. 10.1002/2016GL071328.

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Abstract

The groundwater hydraulic head response to the worldwide and ubiquitous atmospherictide at 2 cycles per day (cpd) is a direct function of confined aquifer compressible storage. The ratio ofthe responses of hydraulic head to the atmospheric pressure change is a measure of aquifer barometricefficiency, from which formation compressibility and aquifer specific storage can be determined in siturather than resorting to laboratory or aquifer pumping tests. The Earth tide also impacts the hydraulic headresponse at the same frequency, and a method is developed here to quantify and remove this interference.As a result, the barometric efficiency can be routinely calculated from 6-hourly hydraulic head, atmosphericpressure, and modeled Earth tide records where available for a minimum of 15 days duration. This newapproach will be of critical importance in assessing worldwide problems of land subsidence or groundwaterresource evaluation that both occur due to groundwater abstraction.

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