Multi‐offset GPR methods for hyporheic zone investigations
ABSTRACT 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 conte...
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crwiley:10.3997/1873-0604.2008034 2023-12-03T10:27:34+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. 2008 http://dx.doi.org/10.3997/1873-0604.2008034 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3997%2F1873-0604.2008034 https://onlinelibrary.wiley.com/doi/pdf/10.3997/1873-0604.2008034 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Near Surface Geophysics volume 7, issue 4, page 247-257 ISSN 1569-4445 1873-0604 Geophysics journal-article 2008 crwiley https://doi.org/10.3997/1873-0604.2008034 2023-11-09T13:25:42Z ABSTRACT 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. Article in Journal/Newspaper north slope Alaska Wiley Online Library (via Crossref) Near Surface Geophysics 7 4 247 257 |
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Open Polar |
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Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Geophysics |
spellingShingle |
Geophysics 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 |
Geophysics |
description |
ABSTRACT 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 |
Article in Journal/Newspaper |
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 |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.3997/1873-0604.2008034 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.3997%2F1873-0604.2008034 https://onlinelibrary.wiley.com/doi/pdf/10.3997/1873-0604.2008034 |
genre |
north slope Alaska |
genre_facet |
north slope Alaska |
op_source |
Near Surface Geophysics volume 7, issue 4, page 247-257 ISSN 1569-4445 1873-0604 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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_ |
1784277374780571648 |