Hydraulic Conductivity Measurements Barrow 2014
Six individual ice cores were collected from Barrow Environmental Observatory in Barrow, Alaska, in May of 2013 as part of the Next Generation Ecosystem Experiment (NGEE). Each core was drilled from a different location at varying depths. A few days after drilling, the cores were stored in coolers p...
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Next Generation Ecosystems Experiment - Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (US); NGEE Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
2015
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Online Access: | https://dx.doi.org/10.5440/1170518 https://www.osti.gov/servlets/purl/1170518/ |
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ftdatacite:10.5440/1170518 2023-05-15T15:39:40+02:00 Hydraulic Conductivity Measurements Barrow 2014 McKnight, Katie Ulrich, Craig Geller, Jill Kneafsey, Tim 2015 https://dx.doi.org/10.5440/1170518 https://www.osti.gov/servlets/purl/1170518/ en eng Next Generation Ecosystems Experiment - Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (US); NGEE Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States) 54 Environmental Sciences Hydraulic Conductivity;Hydrology;Falling Head Test;Barrow, Alaska;DTLB;BD Transect;AB Transect dataset Numeric Data Dataset 2015 ftdatacite https://doi.org/10.5440/1170518 2021-11-05T12:55:41Z Six individual ice cores were collected from Barrow Environmental Observatory in Barrow, Alaska, in May of 2013 as part of the Next Generation Ecosystem Experiment (NGEE). Each core was drilled from a different location at varying depths. A few days after drilling, the cores were stored in coolers packed with dry ice and flown to Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA. 3-dimensional images of the cores were constructed using a medical X-ray computed tomography (CT) scanner at 120kV. Hydraulic conductivity samples were extracted from these cores at LBNL Richmond Field Station in Richmond, CA, in February 2014 by cutting 5 to 8 inch segments using a chop saw. Samples were packed individually and stored at freezing temperatures to minimize any changes in structure or loss of ice content prior to analysis. Hydraulic conductivity was determined through falling head tests using a permeameter [ELE International, Model #: K-770B] (Appendix A). Samples were placed in a latex membrane via a membrane stretcher while frozen. Use of a membrane stretcher made the membranes easier to secure and minimized contact with the sample. A clear polycarbonate sleeve, fabricated with a stainless steel ring at the bottom to keep the sleeve from floating, was placed around the sample inside the permeameter to minimize deformation during analysis. The permeameter was filled with water and 1.0 PSI of air was applied for confining pressure during sample defrost. Outflow valves were left open to allow for incremental thawing and samples were left to thaw for approximately 12 hours. After approximately 12 hours of thaw, initial falling head tests were performed. When the flow was significantly too fast or too slow, the analysis was stopped and the burette size was adjusted accordingly (i.e. a larger diameter burette was used for flows that were faster than desired or a smaller diameter burette was used for flows that were slower than desired). Two to four measurements were collected on each sample and collection stopped when the applied head load exceeded 25% change from the original load. Analyses were performed between 2 to 3 times for each sample. The final hydraulic conductivity calculations were computed using methodology of Das et al., 1985. Dataset Barrow Alaska DataCite Metadata Store (German National Library of Science and Technology) Psi ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
54 Environmental Sciences Hydraulic Conductivity;Hydrology;Falling Head Test;Barrow, Alaska;DTLB;BD Transect;AB Transect |
spellingShingle |
54 Environmental Sciences Hydraulic Conductivity;Hydrology;Falling Head Test;Barrow, Alaska;DTLB;BD Transect;AB Transect McKnight, Katie Ulrich, Craig Geller, Jill Kneafsey, Tim Hydraulic Conductivity Measurements Barrow 2014 |
topic_facet |
54 Environmental Sciences Hydraulic Conductivity;Hydrology;Falling Head Test;Barrow, Alaska;DTLB;BD Transect;AB Transect |
description |
Six individual ice cores were collected from Barrow Environmental Observatory in Barrow, Alaska, in May of 2013 as part of the Next Generation Ecosystem Experiment (NGEE). Each core was drilled from a different location at varying depths. A few days after drilling, the cores were stored in coolers packed with dry ice and flown to Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA. 3-dimensional images of the cores were constructed using a medical X-ray computed tomography (CT) scanner at 120kV. Hydraulic conductivity samples were extracted from these cores at LBNL Richmond Field Station in Richmond, CA, in February 2014 by cutting 5 to 8 inch segments using a chop saw. Samples were packed individually and stored at freezing temperatures to minimize any changes in structure or loss of ice content prior to analysis. Hydraulic conductivity was determined through falling head tests using a permeameter [ELE International, Model #: K-770B] (Appendix A). Samples were placed in a latex membrane via a membrane stretcher while frozen. Use of a membrane stretcher made the membranes easier to secure and minimized contact with the sample. A clear polycarbonate sleeve, fabricated with a stainless steel ring at the bottom to keep the sleeve from floating, was placed around the sample inside the permeameter to minimize deformation during analysis. The permeameter was filled with water and 1.0 PSI of air was applied for confining pressure during sample defrost. Outflow valves were left open to allow for incremental thawing and samples were left to thaw for approximately 12 hours. After approximately 12 hours of thaw, initial falling head tests were performed. When the flow was significantly too fast or too slow, the analysis was stopped and the burette size was adjusted accordingly (i.e. a larger diameter burette was used for flows that were faster than desired or a smaller diameter burette was used for flows that were slower than desired). Two to four measurements were collected on each sample and collection stopped when the applied head load exceeded 25% change from the original load. Analyses were performed between 2 to 3 times for each sample. The final hydraulic conductivity calculations were computed using methodology of Das et al., 1985. |
format |
Dataset |
author |
McKnight, Katie Ulrich, Craig Geller, Jill Kneafsey, Tim |
author_facet |
McKnight, Katie Ulrich, Craig Geller, Jill Kneafsey, Tim |
author_sort |
McKnight, Katie |
title |
Hydraulic Conductivity Measurements Barrow 2014 |
title_short |
Hydraulic Conductivity Measurements Barrow 2014 |
title_full |
Hydraulic Conductivity Measurements Barrow 2014 |
title_fullStr |
Hydraulic Conductivity Measurements Barrow 2014 |
title_full_unstemmed |
Hydraulic Conductivity Measurements Barrow 2014 |
title_sort |
hydraulic conductivity measurements barrow 2014 |
publisher |
Next Generation Ecosystems Experiment - Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (US); NGEE Arctic, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States) |
publishDate |
2015 |
url |
https://dx.doi.org/10.5440/1170518 https://www.osti.gov/servlets/purl/1170518/ |
long_lat |
ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
geographic |
Psi |
geographic_facet |
Psi |
genre |
Barrow Alaska |
genre_facet |
Barrow Alaska |
op_doi |
https://doi.org/10.5440/1170518 |
_version_ |
1766371696201170944 |