دورية أكاديمية
Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T'aakú Kwáan Sít'i), Alaska
| العنوان: | Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T'aakú Kwáan Sít'i), Alaska |
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| المؤلفون: | Jenna M. Zechmann, Martin Truffer, Roman J. Motyka, Jason M. Amundson, Chris F. Larsen |
| المصدر: | Journal of Glaciology, Vol 67, Pp 204-218 (2021) |
| بيانات النشر: | Cambridge University Press, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Environmental sciences LCC:Meteorology. Climatology |
| مصطلحات موضوعية: | Atmosphere/ice/ocean interactions, fluvial transport, glacier hydrology, moraine formation, processes and landforms of glacial erosion, Environmental sciences, GE1-350, Meteorology. Climatology, QC851-999 |
| الوصف: | The recently-advancing Taku Glacier is excavating subglacial sediments at high rates over multi-decadal timescales. However, sediment redistribution over shorter timescales remains unquantified. We use a variety of methods to study subglacial and proglacial sediment redistribution on decadal, seasonal, and daily timescales to gain insight into sub- and proglacial landscape formation. Both excavation and deposition were observed from 2003 to 2015 (2.8 ± 0.9 m a−1 to +2.9 ± 0.9 m a−1). The observed patterns imply that a subglacial conduit has occupied the same site over the past decade. Outwash fans on the subaerial end moraine experience fluvial sediment reworking almost year-round, with net sediment gain in winter and net sediment loss in summer, and an overall mass gain between 2005 and 2015. We estimate that tens of meters of sediment still underlie the glacier terminus, sediments which can be remobilized during future activity. However, imminent retreat from the proglacial moraine will limit its sediment supply, leaving the moraine vulnerable to erosion by bordering rivers. Retreat into an over-deepened basin will leave the glacier vulnerable to increased frontal ablation and accelerating retreat. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0022-1430 1727-5652 60163291 |
| Relation: | https://www.cambridge.org/core/product/identifier/S002214302000101X/type/journal_article; https://doaj.org/toc/0022-1430; https://doaj.org/toc/1727-5652 |
| DOI: | 10.1017/jog.2020.101 |
| URL الوصول: | https://doaj.org/article/3a6c44ad943e44e2b01954e601632912 |
| رقم الأكسشن: | edsdoj.3a6c44ad943e44e2b01954e601632912 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 00221430 17275652 60163291 |
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| DOI: | 10.1017/jog.2020.101 |