Transient river response, captured by channel steepness and its concavity
Mountain rivers draining tropical regions are known to be great conveyor belts carrying efficiently more than half of the global sediment flux to the oceans. Many tropical mountain areas are located in tectonically active belts where the hillslope and stream channel morphology are rapidly evolving i...
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2015
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Διαθέσιμο Online: | http://dspace.ucuenca.edu.ec/handle/123456789/22012 |
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_version_ | 1839952752934912000 |
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author | Vanacker, Veerle |
author2 | Blanckenburg, F. von Govers, Gerard Molina, Armando Campforts, B. Kubik, P. W. |
author2_role | author author author author author |
author_facet | Vanacker, Veerle Blanckenburg, F. von Govers, Gerard Molina, Armando Campforts, B. Kubik, P. W. |
author_role | author |
collection | Repositorio Universidad de Cuenca |
dc.creator.none.fl_str_mv | Vanacker, Veerle Blanckenburg, F. von Govers, Gerard Molina, Armando Campforts, B. Kubik, P. W. |
dc.date.none.fl_str_mv | 2015-06-10T16:13:32Z 2015-06-10T16:13:32Z 2015-01-01 |
dc.format.none.fl_str_mv | application/pdf application/pdf |
dc.identifier.none.fl_str_mv | http://dspace.ucuenca.edu.ec/handle/123456789/22012 doi: 10.1016/j.geomorph.2014.09.013 |
dc.language.none.fl_str_mv | eng |
dc.rights.none.fl_str_mv | http://creativecommons.org/licenses/by-nc-sa/3.0/ec/ info:eu-repo/semantics/openAccess |
dc.source.none.fl_str_mv | reponame:Repositorio Universidad de Cuenca instname:Universidad de Cuenca instacron:UCUENCA |
dc.subject.none.fl_str_mv | Landscape Transience River Longitudinal Profiles Be-Derived Denudation Rates Erosion Control Tropical Andes Ecuador |
dc.title.none.fl_str_mv | Transient river response, captured by channel steepness and its concavity Geomorphology |
dc.type.none.fl_str_mv | info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
description | Mountain rivers draining tropical regions are known to be great conveyor belts carrying efficiently more than half of the global sediment flux to the oceans. Many tropical mountain areas are located in tectonically active belts where the hillslope and stream channel morphology are rapidly evolving in response to changes in base level. Here, we report basin-wide denudation rates for an east–west transect through the tropical Andes. Hillslope and channel morphology vary systematically from east to west, reflecting the transition from high relief, strongly dissected topography in the escarpment zones into relatively low relief topography in the inter-Andean valley. The spatial pattern of differential denudation rates reflects the transient adjustment of the landscape to rapid river incision following tectonic uplift and river diversion. In the inter-Andean valley, upstream of the wave of incision, slopes and river channels display a relatively smooth, concave-up morphology and denudation rates (time scale of 104–105 a) are consistently low (3 to 200 mm/ka). In contrast, slopes and river channels of rejuvenated basins draining the eastern cordillera are steep to very steep; and the studied drainage basins show a wide range of denudation rate values (60 to 400 mm/ka) that increase systematically with increasing basin mean slope gradient, channel steepness, and channel convexity. Drainage basins that are characterised by strong convexities in their river longitudinal profiles systematically have higher denudation rates. As such, this is one of the first studies that provides field-based evidence of a correlation between channel concavity and basin mean denudation rates, consistent with process-based fluvial incision models. |
eu_rights_str_mv | openAccess |
format | article |
id | UCUENCA_b5faaf7b8467f4bcc24f36ad0e0e68aa |
identifier_str_mv | doi: 10.1016/j.geomorph.2014.09.013 |
instacron_str | UCUENCA |
institution | UCUENCA |
instname_str | Universidad de Cuenca |
language | eng |
network_acronym_str | UCUENCA |
network_name_str | Repositorio Universidad de Cuenca |
oai_identifier_str | oai:dspace.ucuenca.edu.ec:123456789/22012 |
publishDate | 2015 |
reponame_str | Repositorio Universidad de Cuenca |
repository.mail.fl_str_mv | . |
repository.name.fl_str_mv | Repositorio Universidad de Cuenca - Universidad de Cuenca |
repository_id_str | 4186 |
rights_invalid_str_mv | http://creativecommons.org/licenses/by-nc-sa/3.0/ec/ |
spelling | Transient river response, captured by channel steepness and its concavityGeomorphologyVanacker, VeerleBlanckenburg, F. vonGovers, GerardMolina, ArmandoCampforts, B.Kubik, P. W.Landscape TransienceRiver Longitudinal ProfilesBe-Derived Denudation RatesErosion ControlTropical AndesEcuadorMountain rivers draining tropical regions are known to be great conveyor belts carrying efficiently more than half of the global sediment flux to the oceans. Many tropical mountain areas are located in tectonically active belts where the hillslope and stream channel morphology are rapidly evolving in response to changes in base level. Here, we report basin-wide denudation rates for an east–west transect through the tropical Andes. Hillslope and channel morphology vary systematically from east to west, reflecting the transition from high relief, strongly dissected topography in the escarpment zones into relatively low relief topography in the inter-Andean valley. The spatial pattern of differential denudation rates reflects the transient adjustment of the landscape to rapid river incision following tectonic uplift and river diversion. In the inter-Andean valley, upstream of the wave of incision, slopes and river channels display a relatively smooth, concave-up morphology and denudation rates (time scale of 104–105 a) are consistently low (3 to 200 mm/ka). In contrast, slopes and river channels of rejuvenated basins draining the eastern cordillera are steep to very steep; and the studied drainage basins show a wide range of denudation rate values (60 to 400 mm/ka) that increase systematically with increasing basin mean slope gradient, channel steepness, and channel convexity. Drainage basins that are characterised by strong convexities in their river longitudinal profiles systematically have higher denudation rates. As such, this is one of the first studies that provides field-based evidence of a correlation between channel concavity and basin mean denudation rates, consistent with process-based fluvial incision models.Cuencavolumen 2282015-06-10T16:13:32Z2015-06-10T16:13:32Z2015-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://dspace.ucuenca.edu.ec/handle/123456789/22012doi: 10.1016/j.geomorph.2014.09.013enghttp://creativecommons.org/licenses/by-nc-sa/3.0/ec/info:eu-repo/semantics/openAccessreponame:Repositorio Universidad de Cuencainstname:Universidad de Cuencainstacron:UCUENCA2020-08-01T01:11:31Zoai:dspace.ucuenca.edu.ec:123456789/22012Institucionalhttp://dspace.ucuenca.edu.ec/Universidad públicahttps://www.ucuenca.edu.ec/http://dspace.ucuenca.edu.ec/oai.Ecuador...opendoar:41862025-08-09T03:56:19.426838Repositorio Universidad de Cuenca - Universidad de Cuencatrue |
spellingShingle | Transient river response, captured by channel steepness and its concavity Vanacker, Veerle Landscape Transience River Longitudinal Profiles Be-Derived Denudation Rates Erosion Control Tropical Andes Ecuador |
status_str | publishedVersion |
title | Transient river response, captured by channel steepness and its concavity |
title_full | Transient river response, captured by channel steepness and its concavity |
title_fullStr | Transient river response, captured by channel steepness and its concavity |
title_full_unstemmed | Transient river response, captured by channel steepness and its concavity |
title_short | Transient river response, captured by channel steepness and its concavity |
title_sort | Transient river response, captured by channel steepness and its concavity |
topic | Landscape Transience River Longitudinal Profiles Be-Derived Denudation Rates Erosion Control Tropical Andes Ecuador |
url | http://dspace.ucuenca.edu.ec/handle/123456789/22012 |