Storage coefficient revisited: is purely vertical strain a good assumption?

Ground Water
Thomas J Burbey

Abstract

The storage coefficient that is used ubiquitously today was first defined by the analytical work of Theis and Jacob over a half-century ago. Inherent within this definition is the restriction of purely vertical compression of the aquifer during a reduction in pressure. The assumption is revisited and quantitatively evaluated by comparing numerical results using both one- and three-dimensional strain models in the presence of three-dimensional flow. Results indicate that (1) calculated hydraulic head values are nearly identical for both models; (2) the release of water from storage in terms of volume strain is nearly identical for both models and that the location of maximum production moves outward from the well as a function of time; (3) the vertical strain components are markedly different with at least 50% of the total volume of water pumped originating from horizontal strain (and increasing to as much as 70%); and (4) for the one-dimensional strain model to yield the necessary quantity of water to the pumped well, the resulting vertical compaction (land subsidence) is as much as four times greater and vertical strain is as much as 60% greater than the three-dimensional strain model. Results indicate that small changes in po...Continue Reading

Citations

May 10, 2006·Ground Water·T N Narasimhan
Jun 28, 2008·Health Care Management Science·Christopher Brasted
Jun 21, 2019·Journal of Geophysical Research. Solid Earth·Chandrakanta OjhaManoochehr Shirzaei

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