Multi-Offset GPR Methods for Hyporheic Zone Investigations
Porosity of stream sediments has a direct effect on hyporheic exchange patterns and rates. Improved estimates of porosity heterogeneity will yield enhanced simulation of hyporheic exchange processes. Ground-penetrating radar (GPR) velocity measurements are strongly controlled by water content thus a...
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ftboisestateu:oai:scholarworks.boisestate.edu:cgiss_facpubs-1070 2023-10-29T02:38:49+01:00 Multi-Offset GPR Methods for Hyporheic Zone Investigations Brosten, Troy R. Bradford, John H. McNamara, James P. Gooseff, Michael N. Zarnetske, Jay P. Bowden, William B. Johnston, Morgan E. 2009-08-01T07:00:00Z https://scholarworks.boisestate.edu/cgiss_facpubs/72 https://doi.org/10.3997/1873-0604.2008034 unknown ScholarWorks https://scholarworks.boisestate.edu/cgiss_facpubs/72 http://dx.doi.org/10.3997/1873-0604.2008034 CGISS Publications and Presentations Geosciences Earth Sciences Geophysics and Seismology text 2009 ftboisestateu https://doi.org/10.3997/1873-0604.2008034 2023-09-29T15:03:39Z Porosity of stream sediments has a direct effect on hyporheic exchange patterns and rates. Improved estimates of porosity heterogeneity will yield enhanced simulation of hyporheic exchange processes. Ground-penetrating radar (GPR) velocity measurements are strongly controlled by water content thus accurate measures of GPR velocity in saturated sediments provides estimates of porosity beneath stream channels using petrophysical relationships. Imaging the substream system using surface based reflection measurements is particularly challenging due to large velocity gradients that occur at the transition from open water to saturated sediments. The continuous multi-offset method improves the quality of subsurface images through stacking and provides measurements of vertical and lateral velocity distributions. We applied the continuous multi-offset method to stream sites on the North Slope, Alaska and the Sawtooth Mountains near Boise, Idaho, USA. From the continuous multi-offset data, we measure velocity using reflection tomography then estimate water content and porosity using the Topp equation. These values provide detailed measurements for improved stream channel hydraulic and thermal modelling. Text north slope Alaska Boise State University: Scholar Works Near Surface Geophysics 7 4 247 257 |
institution |
Open Polar |
collection |
Boise State University: Scholar Works |
op_collection_id |
ftboisestateu |
language |
unknown |
topic |
Geosciences Earth Sciences Geophysics and Seismology |
spellingShingle |
Geosciences Earth Sciences Geophysics and Seismology Brosten, Troy R. Bradford, John H. McNamara, James P. Gooseff, Michael N. Zarnetske, Jay P. Bowden, William B. Johnston, Morgan E. Multi-Offset GPR Methods for Hyporheic Zone Investigations |
topic_facet |
Geosciences Earth Sciences Geophysics and Seismology |
description |
Porosity of stream sediments has a direct effect on hyporheic exchange patterns and rates. Improved estimates of porosity heterogeneity will yield enhanced simulation of hyporheic exchange processes. Ground-penetrating radar (GPR) velocity measurements are strongly controlled by water content thus accurate measures of GPR velocity in saturated sediments provides estimates of porosity beneath stream channels using petrophysical relationships. Imaging the substream system using surface based reflection measurements is particularly challenging due to large velocity gradients that occur at the transition from open water to saturated sediments. The continuous multi-offset method improves the quality of subsurface images through stacking and provides measurements of vertical and lateral velocity distributions. We applied the continuous multi-offset method to stream sites on the North Slope, Alaska and the Sawtooth Mountains near Boise, Idaho, USA. From the continuous multi-offset data, we measure velocity using reflection tomography then estimate water content and porosity using the Topp equation. These values provide detailed measurements for improved stream channel hydraulic and thermal modelling. |
format |
Text |
author |
Brosten, Troy R. Bradford, John H. McNamara, James P. Gooseff, Michael N. Zarnetske, Jay P. Bowden, William B. Johnston, Morgan E. |
author_facet |
Brosten, Troy R. Bradford, John H. McNamara, James P. Gooseff, Michael N. Zarnetske, Jay P. Bowden, William B. Johnston, Morgan E. |
author_sort |
Brosten, Troy R. |
title |
Multi-Offset GPR Methods for Hyporheic Zone Investigations |
title_short |
Multi-Offset GPR Methods for Hyporheic Zone Investigations |
title_full |
Multi-Offset GPR Methods for Hyporheic Zone Investigations |
title_fullStr |
Multi-Offset GPR Methods for Hyporheic Zone Investigations |
title_full_unstemmed |
Multi-Offset GPR Methods for Hyporheic Zone Investigations |
title_sort |
multi-offset gpr methods for hyporheic zone investigations |
publisher |
ScholarWorks |
publishDate |
2009 |
url |
https://scholarworks.boisestate.edu/cgiss_facpubs/72 https://doi.org/10.3997/1873-0604.2008034 |
genre |
north slope Alaska |
genre_facet |
north slope Alaska |
op_source |
CGISS Publications and Presentations |
op_relation |
https://scholarworks.boisestate.edu/cgiss_facpubs/72 http://dx.doi.org/10.3997/1873-0604.2008034 |
op_doi |
https://doi.org/10.3997/1873-0604.2008034 |
container_title |
Near Surface Geophysics |
container_volume |
7 |
container_issue |
4 |
container_start_page |
247 |
op_container_end_page |
257 |
_version_ |
1781065186911715328 |