Self-potential investigation of moraine dam seepage
International audience Self-potential (SP) and electrical resistivity measurements are used to investigate seepage at a remote moraine dam in the Sierra Nevada of California. The site is a small terminal moraine impounding roughly 300,000 m3 of water at ~ 3400 m a.s.l. Suspicious fine sediment in a...
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ftccsdartic:oai:HAL:insu-00681331v1 2023-05-15T16:37:46+02:00 Self-potential investigation of moraine dam seepage Moore, Jeffrey R. Boleve, Alexandre Sanders, Johnny W. Glaser, Steven D. Department of Civil and Environmental Engineering Berkeley (CEE) University of California Berkeley University of California-University of California Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) Institut des Sciences de la Terre (ISTerre) Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Department of Earth and Planetary Science UC Berkeley (EPS) Funding was provided in part by the Jane Lewis Foundation and by the Francis J. Turner Fellowship. 2011 https://hal-insu.archives-ouvertes.fr/insu-00681331 https://doi.org/10.1016/j.jappgeo.2011.06.014 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jappgeo.2011.06.014 insu-00681331 https://hal-insu.archives-ouvertes.fr/insu-00681331 doi:10.1016/j.jappgeo.2011.06.014 ISSN: 0926-9851 Journal of Applied Geophysics https://hal-insu.archives-ouvertes.fr/insu-00681331 Journal of Applied Geophysics, Elsevier, 2011, 74 (4), pp.277-286. ⟨10.1016/j.jappgeo.2011.06.014⟩ Self-potential Moraine dam Seepage erosion Electrokinetic Permafrost [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.1016/j.jappgeo.2011.06.014 2021-10-24T16:41:03Z International audience Self-potential (SP) and electrical resistivity measurements are used to investigate seepage at a remote moraine dam in the Sierra Nevada of California. The site is a small terminal moraine impounding roughly 300,000 m3 of water at ~ 3400 m a.s.l. Suspicious fine sediment in a small lake at the dam's downstream toe prompted initial concerns that anomalous seepage may be eroding matrix material from the moraine. 235 individual SP measurements covering the surface of the dam were collected in order to investigate electrokinetic current sources resulting from seepage, while resistivity soundings probed moraine stratigraphy and suggest that the till contains interstitial ice. Contoured SP data reveal a non-uniform voltage distribution over the moraine dam and two distinct negative SP anomalies. The first, located in the central area of the moraine, shows a broad negative SP zone around the crest and increasingly positive SP moving downhill towards both the upstream and downstream toes. This anomaly can be explained by shallow gravitational groundwater flow in the near subsurface combined with upward groundwater flux through evapotranspiration; numerical simulation of the combined effect matches field data well. The second SP anomaly has a tightly localized distribution and can be explained by vertically descending flow into a bedrock fault conduit. Our conceptual seepage model suggests that flow travels from Dana Lake first at the boundary of ice-filled moraine and bedrock before converging on a concentrated channel in the subvertical fault zone. Positive SP near the dam abutments results from groundwater inflow from adjacent hillslopes. Combined analyses suggest that seepage erosion is not currently affecting the moraine dam, and that the sediment observed on the bed of the downstream toe lake is likely a remnant of past outflow events. Article in Journal/Newspaper Ice permafrost Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Journal of Applied Geophysics 74 4 277 286 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Self-potential Moraine dam Seepage erosion Electrokinetic Permafrost [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
spellingShingle |
Self-potential Moraine dam Seepage erosion Electrokinetic Permafrost [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Moore, Jeffrey R. Boleve, Alexandre Sanders, Johnny W. Glaser, Steven D. Self-potential investigation of moraine dam seepage |
topic_facet |
Self-potential Moraine dam Seepage erosion Electrokinetic Permafrost [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience Self-potential (SP) and electrical resistivity measurements are used to investigate seepage at a remote moraine dam in the Sierra Nevada of California. The site is a small terminal moraine impounding roughly 300,000 m3 of water at ~ 3400 m a.s.l. Suspicious fine sediment in a small lake at the dam's downstream toe prompted initial concerns that anomalous seepage may be eroding matrix material from the moraine. 235 individual SP measurements covering the surface of the dam were collected in order to investigate electrokinetic current sources resulting from seepage, while resistivity soundings probed moraine stratigraphy and suggest that the till contains interstitial ice. Contoured SP data reveal a non-uniform voltage distribution over the moraine dam and two distinct negative SP anomalies. The first, located in the central area of the moraine, shows a broad negative SP zone around the crest and increasingly positive SP moving downhill towards both the upstream and downstream toes. This anomaly can be explained by shallow gravitational groundwater flow in the near subsurface combined with upward groundwater flux through evapotranspiration; numerical simulation of the combined effect matches field data well. The second SP anomaly has a tightly localized distribution and can be explained by vertically descending flow into a bedrock fault conduit. Our conceptual seepage model suggests that flow travels from Dana Lake first at the boundary of ice-filled moraine and bedrock before converging on a concentrated channel in the subvertical fault zone. Positive SP near the dam abutments results from groundwater inflow from adjacent hillslopes. Combined analyses suggest that seepage erosion is not currently affecting the moraine dam, and that the sediment observed on the bed of the downstream toe lake is likely a remnant of past outflow events. |
author2 |
Department of Civil and Environmental Engineering Berkeley (CEE) University of California Berkeley University of California-University of California Department of Earth Sciences Swiss Federal Institute of Technology - ETH Zürich (D-ERDW) Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) Institut des Sciences de la Terre (ISTerre) Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Department of Earth and Planetary Science UC Berkeley (EPS) Funding was provided in part by the Jane Lewis Foundation and by the Francis J. Turner Fellowship. |
format |
Article in Journal/Newspaper |
author |
Moore, Jeffrey R. Boleve, Alexandre Sanders, Johnny W. Glaser, Steven D. |
author_facet |
Moore, Jeffrey R. Boleve, Alexandre Sanders, Johnny W. Glaser, Steven D. |
author_sort |
Moore, Jeffrey R. |
title |
Self-potential investigation of moraine dam seepage |
title_short |
Self-potential investigation of moraine dam seepage |
title_full |
Self-potential investigation of moraine dam seepage |
title_fullStr |
Self-potential investigation of moraine dam seepage |
title_full_unstemmed |
Self-potential investigation of moraine dam seepage |
title_sort |
self-potential investigation of moraine dam seepage |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal-insu.archives-ouvertes.fr/insu-00681331 https://doi.org/10.1016/j.jappgeo.2011.06.014 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 0926-9851 Journal of Applied Geophysics https://hal-insu.archives-ouvertes.fr/insu-00681331 Journal of Applied Geophysics, Elsevier, 2011, 74 (4), pp.277-286. ⟨10.1016/j.jappgeo.2011.06.014⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jappgeo.2011.06.014 insu-00681331 https://hal-insu.archives-ouvertes.fr/insu-00681331 doi:10.1016/j.jappgeo.2011.06.014 |
op_doi |
https://doi.org/10.1016/j.jappgeo.2011.06.014 |
container_title |
Journal of Applied Geophysics |
container_volume |
74 |
container_issue |
4 |
container_start_page |
277 |
op_container_end_page |
286 |
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1766028073925345280 |