Hydraulic Tomography of Sequential Pumping Tests-Reproducibility Analysis.

This study investigates the reproducibility of estimates of hydraulic properties of a heterogeneous aquifer by sequential pumping tests.  In 2004, a sequential pumping test was conducted at a site that consists of eleven wells, on the campus of the National Yunlin University of Science and Technology in Taiwan. In 2010, the same sequential pumping test was conducted again with different pumping rates and under initial and boundary conditions.

Two joint interpretation methods, Steady-State Hydraulic Tomography (SSHT) and Transient Hydraulic Tomography (THT), were used to analyse the data sets from the two pumping tests to derive the spatial distribution of transmissivity and storativity.   Results of the analysis show that both SSHT and THT derive very similar hydraulic properties based on the sequential pumping test conducted in 2004 and 2010.  That is, the estimated properties by hydraulic tomography are generally reproducible even though the initial, boundary, and pumping rates are different.  In other words, the hydraulic heterogeneity derived from the hydraulic tomography is real.