Analysis of subsurface soil cores from the site of a field-scale groundwater remediation experiment at Dover Air Force Base, Delaware, has revealed that tetrachloroethene and trichloroethene contamination extends into an aquitard underlying a groundwater aquifer. Geostatistical inverse modeling is used to make inferences regarding the historical concentration conditions in the overlying aquifer...

Groundwater is a reservoir of fresh water located beneath the ground surface in soil pore spaces and fractures lithology formations. contained aquifer layer has certain depth. Aquifer measurement was conducted with five tracks using AGI Super Sting R1 IP tool spacing 25 m track length 675 Balangan County. This study aims to determine 2D cross-sectional model, analyze types, depth, thickness, ty...

Harmonic Earth tide components in well water levels have been used to estimate hydraulic and geomechanical subsurface properties. However, the robustness of various methods based on analytical solutions has not established. First, we review theory examine latest solution relate tides. Second, develop verify a novel numerical model coupling hydraulics geomechanics strains. Third, assess conditio...

Abstract Time fluctuations of groundwater flux are known to affect solute transport and thus the width penetration seawater intrusion. Yet, most theoretical laboratory studies mixed‐convective processes accompanying intrusion assume constant extraction rates, even though real‐world pumping is usually intermittent. In this study, dynamic changes an experimental saltwater wedge caused by intermit...

A fully penetrating cut-off wall is a vertical seepage barrier that penetrates an aquifer and embedded in underlying aquitard to certain depth. Groundwater with this type of occurs through three paths: leakage the body aquifer, aquitard, under wall. Seepage first path can be simply treated as one-dimensional flow. However, due mutual influence latter two paths, problem complicated still needs s...

Biogeochemical gas production resulting in free phase formation can severely affect groundwater and solute transport aquifers. Such gas–water interactions are important aquifers affected by geogenic As, which commonly associated with biogeochemical CH4 production. Additionally, the influence of aquitards on As concentrations contaminated has recently been challenged. These observations prompted...

[1] We present a general framework for probabilistic risk assessment (PRA) of subsurface contamination. PRA provides a natural venue for the rigorous quantification of structural (model) and parametric uncertainties inherent in predictions of subsurface flow and transport. A typical PRA starts by identifying relevant components of a subsurface system (e.g., a buried solid-waste tank, an aquitar...

This study presents improved understanding of sensitivity analysis methods through a comparison of the local sensitivity and two global sensitivity analysis methods: the Morris and Sobol′/Saltelli methods. We re-interpret the variance-based sensitivity indices from the Sobol′/Saltelli method as difference-based measures. It suggests that the difference-based local and Morris methods provide the...