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Fracture Network Characterization of an Aquitard Surface within the Wonewoc Sandstone using Digital Outcrop Photogrammetry and Discrete Fracture Network (DFN) Modelling

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Title: Fracture Network Characterization of an Aquitard Surface within the Wonewoc Sandstone using Digital Outcrop Photogrammetry and Discrete Fracture Network (DFN) Modelling
Author: Morgan, Christopher
Department: School of Engineering
Program: Engineering
Advisor: Parker, Beth
Abstract: At a research site in South-Central Wisconsin, head profiles from high-resolution multilevel monitoring wells indicate the presence of a laterally continuous aquitard surface where head loss occurs near the middle of the Wonewoc Sandstone. Fracture data from continuous rock cores, down-hole geophysical logging and hydraulic testing were correlated with fracture measurements from six outcrops to evaluate whether the head loss is caused by poor vertical connectivity between fracture networks in the upper and lower portions of the aquifer. Outcrop observations indicate that ~90% of joints terminate at, or near the contact between the Ironton and Galesville Members of the Wonewoc, at the same vertical position as where the head loss is observed in the MLS. Numerical modelling using the fracture data was able to reproduce the head gradients observed at the site and showed that the aquitard surface is highly sensitive to fracture termination percentage near the Ironton-Galesville contact.
URI: http://hdl.handle.net/10214/17416
Date: 2019-09
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