Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains
Abstract The retreat of glaciers in response to climate warming leads to substantial changes in meltwater and sediment yield. Glacial shrinkage also induces the emergence and growth of proglacial margin landforms, which strongly affect water and sedimentary transfers from the glacier to the outwash...
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crwiley:10.1002/ldr.3127 2024-06-02T08:07:04+00:00 Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains Roussel, Erwan Marren, Philip M. Cossart, Etienne Toumazet, Jean‐Pierre Chenet, Marie Grancher, Delphine Jomelli, Vincent GEOLAB-CNRS 2018 http://dx.doi.org/10.1002/ldr.3127 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fldr.3127 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ldr.3127 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ldr.3127 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Land Degradation & Development volume 29, issue 10, page 3753-3771 ISSN 1085-3278 1099-145X journal-article 2018 crwiley https://doi.org/10.1002/ldr.3127 2024-05-03T11:43:47Z Abstract The retreat of glaciers in response to climate warming leads to substantial changes in meltwater and sediment yield. Glacial shrinkage also induces the emergence and growth of proglacial margin landforms, which strongly affect water and sedimentary transfers from the glacier to the outwash plains. On a decadal timescale, field observations show that outwash plains of retreating glaciers typically exhibit proximal incision, which decreases in magnitude downstream and stops at an inflection point where aggradation begins. Nevertheless, there is a lack of knowledge about the rates and magnitude of this fluvial adjustment and the effects of the proglacial margin configuration on the temperance or the aggravation of this fluvial adjustment to glacier retreat. This paper investigates the proglacial rivers of 14 retreating glaciers in south‐east Iceland over a post‐Little Ice Age timescale, combining fluvial deposits mapping, lichenometric dating, and long‐profile measurements of proglacial fluvial terraces. Our results demonstrate that (a) proximal incision, associated with distal aggradation and downstream migration of the inflection point, is the dominant pattern of proglacial river response to post‐Little Ice Age glacier retreat in Iceland; (b) estimated mean rates of downstream migration of the inflection point range between 5 and 46 m·a −1 and (c) the downstream migration rate of the inflection point is positively correlated with the proportion of proglacial lakes within the glacier foreland. These findings suggest that proglacial margins dominated by proglacial lakes intensify the rates of proximal incision and inflection point migration. Article in Journal/Newspaper glacier Iceland Wiley Online Library Land Degradation & Development 29 10 3753 3771 |
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English |
description |
Abstract The retreat of glaciers in response to climate warming leads to substantial changes in meltwater and sediment yield. Glacial shrinkage also induces the emergence and growth of proglacial margin landforms, which strongly affect water and sedimentary transfers from the glacier to the outwash plains. On a decadal timescale, field observations show that outwash plains of retreating glaciers typically exhibit proximal incision, which decreases in magnitude downstream and stops at an inflection point where aggradation begins. Nevertheless, there is a lack of knowledge about the rates and magnitude of this fluvial adjustment and the effects of the proglacial margin configuration on the temperance or the aggravation of this fluvial adjustment to glacier retreat. This paper investigates the proglacial rivers of 14 retreating glaciers in south‐east Iceland over a post‐Little Ice Age timescale, combining fluvial deposits mapping, lichenometric dating, and long‐profile measurements of proglacial fluvial terraces. Our results demonstrate that (a) proximal incision, associated with distal aggradation and downstream migration of the inflection point, is the dominant pattern of proglacial river response to post‐Little Ice Age glacier retreat in Iceland; (b) estimated mean rates of downstream migration of the inflection point range between 5 and 46 m·a −1 and (c) the downstream migration rate of the inflection point is positively correlated with the proportion of proglacial lakes within the glacier foreland. These findings suggest that proglacial margins dominated by proglacial lakes intensify the rates of proximal incision and inflection point migration. |
author2 |
GEOLAB-CNRS |
format |
Article in Journal/Newspaper |
author |
Roussel, Erwan Marren, Philip M. Cossart, Etienne Toumazet, Jean‐Pierre Chenet, Marie Grancher, Delphine Jomelli, Vincent |
spellingShingle |
Roussel, Erwan Marren, Philip M. Cossart, Etienne Toumazet, Jean‐Pierre Chenet, Marie Grancher, Delphine Jomelli, Vincent Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
author_facet |
Roussel, Erwan Marren, Philip M. Cossart, Etienne Toumazet, Jean‐Pierre Chenet, Marie Grancher, Delphine Jomelli, Vincent |
author_sort |
Roussel, Erwan |
title |
Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
title_short |
Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
title_full |
Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
title_fullStr |
Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
title_full_unstemmed |
Incision and aggradation in proglacial rivers: Post‐Little Ice Age long‐profile adjustments of Southern Iceland outwash plains |
title_sort |
incision and aggradation in proglacial rivers: post‐little ice age long‐profile adjustments of southern iceland outwash plains |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/ldr.3127 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fldr.3127 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ldr.3127 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ldr.3127 |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_source |
Land Degradation & Development volume 29, issue 10, page 3753-3771 ISSN 1085-3278 1099-145X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ldr.3127 |
container_title |
Land Degradation & Development |
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29 |
container_issue |
10 |
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3753 |
op_container_end_page |
3771 |
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1800752081720573952 |