Migration of a groundwater contaminant plume by stratabound flow in Waste Area Grouping 1 at Oak Ridge National Laboratory, Oak Ridge, Tennessee
0
Citation
0
Reference
10
Related Paper
Abstract:
The discovery of radiologically contaminated groundwater in core hole CH-8 in the western portion of Waste Area Grouping (WAG) 1 at Oak Ridge National Laboratory (ORNL) prompted a detailed investigation to identify the contaminant plume. Utilizing a working hypothesis of stratabound groundwater flow and contaminant transport, investigators analyzed existing subsurface geologic data to predict the contaminant plume discharge location in first Creek and locations of contaminated groundwater seepage into storm drains. The hypothesis states that differential lithologic/fracture conditions lead to the development of preferred flow and transport pathways, of discrete vertical extent, which may not be coincident with the hydraulic gradient. Leakage out of the stratabound pathway is a minor component of the overall plume configuration.Keywords:
Lithology
Panache
This document provides a systems description of the Reference Design for The Next Step (TNS) evolved at Oak Ridge National Laboratory (ORNL) during FY 1978. The description is presented on the basis of 24 individual device and facility systems. Additional information on these systems, the Reference Design, and the FY 1978 Oak Ridge TNS activities can be found in the associated technical memoranda, ORNL/TM-6720 and ORNL/TM-6722--ORNL/TM-6733.
Cite
Citations (5)
This report documents the electrical tests performed on the Semikron high-voltage automotive integrated power module (AIPM) at Oak Ridge National Laboratory (ORNL). Testing was performed in the 100-hp dynamometer test cell at the National Transportation Research Center.
Dynamometer
National standard
Cite
Citations (1)
Most groundwater equations for flow toward wells use a set of assumptions and idealizations about the aquifer–well configuration so that analytical expressions can be derived for steady-state and unsteady-state flows. In this article, the main assumption in these equations is that constant hydraulic conductivity is relaxed and instead allows radial variability. The basic question is how the hydraulic conductivity gradient affects groundwater flow. Changes in hydraulic conductivity influence groundwater flow; any local changes in the hydraulic conductivity cause local changes in hydraulic gradient and in groundwater velocity. This problem is solved using water balance equations with changes in linear radial hydraulic conductivity. Simple but more general equations for groundwater flow toward wells are derived and applied to steady-state groundwater flows in a confined aquifer. This formulation reduces to the classical Theim solution for constant hydraulic conductivity. The use of this methodology is presented for steady-state groundwater measurement from a well in the Arabian Peninsula. It is observed that constant hydraulic conductivity underestimates transmissivity, compared to the numerical example given in this article, by about 41%.
Groundwater flow equation
Slug test
Groundwater model
Cite
Citations (7)
This report provides second-year project simulation results for the multi-year project titled “Evaluation of Variable Refrigeration Flow (VRF) system on Oak Ridge National Laboratory (ORNL)’s Flexible Research Platform (FRP).”
Cite
Citations (0)
This report documents the electrical tests performed on the Semikron high-voltage automotive integrated power module (AIPM) at the Oak Ridge National Laboratory (ORNL). Testing was performed with an inductive/resistive load and with a motor load at the National Transportation Research Center (NTRC) during the second quarter of FY 2005.
Quarter (Canadian coin)
National laboratory
National standard
Cite
Citations (0)
The Oak Ridge National Laboratory is a large (5300 people), US-government-funded laboratory, which performs research in many disciplines and in many technological areas. Programs and organization of ORNL are described for the People's Republic of China. (RWR)
National laboratory
Cite
Citations (0)
Electron tomography is a powerful tool for characterization of three-dimensional (3D) nanoscale materials and devices.Bright-field (BF) and high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM) are two widely used imaging modes in electron tomography [1,2].These imaging modalities have proven to be useful for characterizing the structure of carbon-supported platinum (Pt/C) electrocatalysts used in fuel cells, which are an important class of clean energy conversion systems.BF and HAADF-STEM images are typically simultaneously acquired due to the complementary information they contain, as BF-STEM is more suitable for characterizing carbon due to its ability to detect lighter elements, while HAADF-STEM is more suitable for characterizing platinum due to its sensitivity to atomic number.However, the quality of BF-and HAADF-STEM images is often compromised by various artifacts, such as local blurring due to abrupt contrast changes as well as missing wedge artifacts which can severely impact the accuracy of the reconstructed 3D images.The traditional methods of reconstruction, such as Filtered Back-projection (FBP) [3], Simultaneous Iterative Reconstruction Technique (SIRT) [4], and Model-Based Iterative Reconstruction (MBIR) [5], are often not suitable for removing these artifacts effectively.To address this challenge, we present a novel approach called MBIR with Artifact Reduction and Adaptive Regularization (MBIR-ARAR).This method leverages an adaptive regularization that adjusts the strength of the regularization in real-time based on the image data, and an artifact reduction technique to reduce the artifacts in the reconstructed images.Our approach distinguishes itself from traditional methods by incorporating an adaptive regularization, which allows the method to balance the trade-off between preserving high-frequency and low-frequency information in the image.Additionally, the artifact reduction technique further improves the quality of the reconstructed images.The MBIR-ARAR method is a two-step approach for reducing artifacts in BF-STEM and HAADF-STEM images of fuel cells and characterizing both carbon and platinum.The procedure is as follows.
National laboratory
Cite
Citations (4)
This is the inaugural issues of an annual publication about the Oak Ridge National Laboratory. Here you will find a brief overview of ORNL, a sampling of our recent research achievements, and a glimpse of the directions we want to take over the next 15 years. A major purpose of ornl 89 is to provide the staff with a sketch of the character and dynamics of the Laboratory.
National laboratory
Sketch
Cite
Citations (23)
National laboratory
Geological survey
Disk formatting
Cite
Citations (0)
The National Research Facility for Small‐Angle Neutron Scattering is being established at the Oak Ridge National Laboratory by the National Science Foundation. The facility, designed to be accessible to researchers in a wide variety of disciplines, should be in operation by mid‐1979.
National laboratory
Foundation (evidence)
Cite
Citations (0)