Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model.
This work presents numerical assessments of possible routing paths for the reported late Pleistocene Missoula floods, which involved Earth’s largest known peak discharges of freshwater. For our numerical model, we adopt the diffusion wave approximation of the shallow-water equation with the empirica...
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Online Access: | http://hdl.handle.net/11564/218414 https://doi.org/10.1016/j.envsoft.2006.07.006 https://www.sciencedirect.com/science/article/abs/pii/S1364815206002003?via=ihub |
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ftunivchietiiris:oai:ricerca.unich.it:11564/218414 2024-02-04T10:01:18+01:00 Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. H. MIYAMOTO KOMATSU, Goro V. R. BAKER J. M. DOHM K. ITOH H. TOSAKA H., Miyamoto Komatsu, Goro V. R., Baker J. M., Dohm K., Itoh H., Tosaka 2007 ELETTRONICO http://hdl.handle.net/11564/218414 https://doi.org/10.1016/j.envsoft.2006.07.006 https://www.sciencedirect.com/science/article/abs/pii/S1364815206002003?via=ihub eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000247403800003 volume:22 firstpage:1400 lastpage:1408 numberofpages:9 journal:ENVIRONMENTAL MODELLING & SOFTWARE http://hdl.handle.net/11564/218414 doi:10.1016/j.envsoft.2006.07.006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34147111798 https://www.sciencedirect.com/science/article/abs/pii/S1364815206002003?via=ihub info:eu-repo/semantics/closedAccess Cataclysmic flood Channeled Scabland Glacial Lake Missoula Numerical simulation Depth-averaged info:eu-repo/semantics/article 2007 ftunivchietiiris https://doi.org/10.1016/j.envsoft.2006.07.006 2024-01-09T23:08:43Z This work presents numerical assessments of possible routing paths for the reported late Pleistocene Missoula floods, which involved Earth’s largest known peak discharges of freshwater. For our numerical model, we adopt the diffusion wave approximation of the shallow-water equation with the empirical Manning coefficient. This simplification is required because (1) most previous studies are one-dimensional or analytical studies based on simple equations, so that our two-dimensional expansion is a natural step towards more sophisticated models; (2) a simple model can easily incorporate the effect of complicated topography; and (3) lower computational costs permit a broader exploration of parameters. Important and new insights obtained from this work include: (1) numerically, we confirm the presence of the Cordilleran Ice Sheet at the time of the Missoula floods; (2) floods with relatively small peak discharges cannot inundate some major reaches, including the Cheney Palouse Scabland Tract; (3) deposits indicative of multiple floods are mostly confined in the locations that can be inundated by relatively lower peak flood discharges; and (4) although Lake Missoula glacial lake failure scenario can reasonably reproduce extensive water coverage, the best fit result to the geological evidence of flooding is obtained when the total water volume is three times larger than that estimated for Glacial Lake Missoula. The above results do not negate previous works, but indicate the need for further detailed field investigation and more sophisticated modeling in order to pursue further understanding of the complex behavior of megaflooding in the Channeled Scabland. Article in Journal/Newspaper Ice Sheet ARUd'A - Archivio Istituzionale della ricerca dell'università Chieti-Pescara (IRIS) Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Environmental Modelling & Software 22 10 1400 1408 |
institution |
Open Polar |
collection |
ARUd'A - Archivio Istituzionale della ricerca dell'università Chieti-Pescara (IRIS) |
op_collection_id |
ftunivchietiiris |
language |
English |
topic |
Cataclysmic flood Channeled Scabland Glacial Lake Missoula Numerical simulation Depth-averaged |
spellingShingle |
Cataclysmic flood Channeled Scabland Glacial Lake Missoula Numerical simulation Depth-averaged H. MIYAMOTO KOMATSU, Goro V. R. BAKER J. M. DOHM K. ITOH H. TOSAKA Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
topic_facet |
Cataclysmic flood Channeled Scabland Glacial Lake Missoula Numerical simulation Depth-averaged |
description |
This work presents numerical assessments of possible routing paths for the reported late Pleistocene Missoula floods, which involved Earth’s largest known peak discharges of freshwater. For our numerical model, we adopt the diffusion wave approximation of the shallow-water equation with the empirical Manning coefficient. This simplification is required because (1) most previous studies are one-dimensional or analytical studies based on simple equations, so that our two-dimensional expansion is a natural step towards more sophisticated models; (2) a simple model can easily incorporate the effect of complicated topography; and (3) lower computational costs permit a broader exploration of parameters. Important and new insights obtained from this work include: (1) numerically, we confirm the presence of the Cordilleran Ice Sheet at the time of the Missoula floods; (2) floods with relatively small peak discharges cannot inundate some major reaches, including the Cheney Palouse Scabland Tract; (3) deposits indicative of multiple floods are mostly confined in the locations that can be inundated by relatively lower peak flood discharges; and (4) although Lake Missoula glacial lake failure scenario can reasonably reproduce extensive water coverage, the best fit result to the geological evidence of flooding is obtained when the total water volume is three times larger than that estimated for Glacial Lake Missoula. The above results do not negate previous works, but indicate the need for further detailed field investigation and more sophisticated modeling in order to pursue further understanding of the complex behavior of megaflooding in the Channeled Scabland. |
author2 |
H., Miyamoto Komatsu, Goro V. R., Baker J. M., Dohm K., Itoh H., Tosaka |
format |
Article in Journal/Newspaper |
author |
H. MIYAMOTO KOMATSU, Goro V. R. BAKER J. M. DOHM K. ITOH H. TOSAKA |
author_facet |
H. MIYAMOTO KOMATSU, Goro V. R. BAKER J. M. DOHM K. ITOH H. TOSAKA |
author_sort |
H. MIYAMOTO |
title |
Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
title_short |
Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
title_full |
Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
title_fullStr |
Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
title_full_unstemmed |
Cataclysmic Scabland flooding: Insights from a simple depth-averaged numerical model. |
title_sort |
cataclysmic scabland flooding: insights from a simple depth-averaged numerical model. |
publishDate |
2007 |
url |
http://hdl.handle.net/11564/218414 https://doi.org/10.1016/j.envsoft.2006.07.006 https://www.sciencedirect.com/science/article/abs/pii/S1364815206002003?via=ihub |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake |
geographic_facet |
Glacial Lake |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000247403800003 volume:22 firstpage:1400 lastpage:1408 numberofpages:9 journal:ENVIRONMENTAL MODELLING & SOFTWARE http://hdl.handle.net/11564/218414 doi:10.1016/j.envsoft.2006.07.006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34147111798 https://www.sciencedirect.com/science/article/abs/pii/S1364815206002003?via=ihub |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.envsoft.2006.07.006 |
container_title |
Environmental Modelling & Software |
container_volume |
22 |
container_issue |
10 |
container_start_page |
1400 |
op_container_end_page |
1408 |
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1789967060138196992 |