Estimation of effective aquifer hydraulic properties from an aquifer test with multi-well observations (Taiwan)

Improved predictions of saturated and unsaturated zone drawdowns in a heterogeneous unconfined aquifer via transient hydraulic tomography: Laboratory sandbox experiments

“…It is reasonable to expect similar limitations for analytical solutions used to estimate parameters from unconfined pumping tests. Similar results were reported by Wen et al (2010) for field aquifer tests with a large number of observation wells.…”

“…Recently, the homogeneity assumption required by analytical solutions for heterogeneous saturated aquifers have come into question by Wu et al (2005) and Wen et al (2010). In particular, Wu et al (2005) used random Gaussian fields (of transmissivity and storativity) to demonstrate that parameter estimates made using the Theis (1935) solution varied throughout the duration of the pumping test.…”

Towards a better estimate of storage properties of aquifer with magnetic resonance sounding

“…However, the averaging property of conventional pumping test has been questioned in heterogeneous aquifers (e.g. Wen et al, 2010;Wu et al, 2005;Yeh and Lee, 2007) and the hydraulic tomography method has been proposed for improving the spatial resolution of conventional test (Butler et al, 1999). The hydraulic tomography involves the simultaneous analysis of groundwater head responses recorded at numerous locations and produced by a sequence of pumping stressing different portions of the aquifer.…”

Joint interpretation of sequential pumping tests in unconfined aquifers

“…Traditional characterization approaches have adopted homogeneous conceptual models that assume aquifer homogeneity and have attempted to derive effective hydraulic parameters based on drawdowns from a single pumping test, for example, those by Theis [1935] and Cooper and Jacob [1946] for confined aquifers and those by Boulton [1963], Dagan [1967], Brutsaert [1970], Streltsova [1972aStreltsova [ , 1972b, Neuman [1972], Lakshminarayana and Rajagopalan [1978], Moench [1995], Mathias and Butler [2006], and Mishra and Neuman [2010] for unconfined aquifers. Recent numerical, sandbox, and field experiments by Wu et al [2005], Straface et al [2007], Xiang et al [2009], Wen et al [2010], Huang et al [2011], and Berg and Illman [2011b] however questioned the representativeness of the estimates from these conventional approaches.…”