دورية أكاديمية
Glacial isostatic adjustment directed incision of the Channeled Scabland by Ice Age megafloods
| العنوان: | Glacial isostatic adjustment directed incision of the Channeled Scabland by Ice Age megafloods |
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| المؤلفون: | Pico, Tamara, David, Scott R., Larsen, Isaac J., Mix, Alan C., Lehnigk, Karin, Lamb, Michael P. |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America, 119(8), Art. No. e2109502119, (2022-02-22) |
| بيانات النشر: | National Academy of Sciences |
| سنة النشر: | 2022 |
| المجموعة: | Caltech Authors (California Institute of Technology) |
| مصطلحات موضوعية: | Channeled Scabland, glacial isostatic adjustment, erosional history, Multidisciplinary |
| الوصف: | During the last deglaciation, dozens of glacial outburst floods—among the largest known floods on Earth—scoured the Channeled Scabland landscape of eastern Washington. Over this same period, deformation of the Earth's crust in response to the growth and decay of ice sheets changed the topography by hundreds of meters. Here, we investigated whether glacial isostatic adjustment affected routing of the Missoula floods and incision of the Channeled Scabland from an impounded, glacial Lake Columbia. We used modern topography corrected for glacial isostatic adjustment as an input to flood models that solved the depth-averaged, shallow water equations and compared the results to erosion constraints. Results showed that floods could have traversed and eroded parts of two major tracts of the Channeled Scabland—Telford-Crab Creek and Cheney–Palouse—near 18 ka, whereas glacial isostatic adjustment limited flow into the Cheney–Palouse tract at 15.5 ka. Partitioning of flow between tracts was governed by tilting of the landscape, which affected the filling and overspill of glacial Lake Columbia directly upstream of the tracts. These results highlight the impact of glacial isostatic adjustment on megaflood routing and landscape evolution. ; © 2022 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY). Edited by Thomas Dunne, Bren School of Environmental Science and Management, University of California, Santa Barbara, CA; received May 26, 2021; accepted December 15, 2021. T.P. acknowledges funding from the NSF-EAR (Division of Earth Sciences) Postdoctoral Fellowship and the University of California President's Postdoc Fellowship. M.P.L and I.J.L. acknowledge support from a collaborative NSF grant (1529110 and 1529528). K.L. acknowledges support from an NSF Graduate Research Fellowship. Data Availability: Source data for this research, including hydrodynamic modeling data, GIA-corrected topographic reconstructions, and analysis scripts, are ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | unknown |
| العلاقة: | https://doi.org/10.5281/zenodo.5275157Test; https://doi.org/10.1073/pnas.2109502119Test; oai:authors.library.caltech.edu:6b72n-pct15; https://www.ncbi.nlm.nih.gov/pmc/PMC8872708Test; eprintid:113450; resolverid:CaltechAUTHORS:20220215-959810500 |
| DOI: | 10.1073/pnas.2109502119 |
| الإتاحة: | https://doi.org/10.1073/pnas.210950211910.5281/zenodo.5275157Test https://www.ncbi.nlm.nih.gov/pmc/PMC8872708Test |
| حقوق: | info:eu-repo/semantics/openAccess ; Other |
| رقم الانضمام: | edsbas.22A460F8 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1073/pnas.2109502119 |
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