Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes?
Aeolian features framed as foredunes worldwide, whose classification faces challenges to separate wave-formed from aeolian ridges, are relevant to the context of anthropic control. An example of this kind of morphology, previously classified as foredunes, is arranged along Brazil’s northeastern coas...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/12/10/364 |
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| author | Alexandre Medeiros de Carvalho Vanda Claudino-Sales Sergio Bezerra Lima Junior Leticia Mesquita Eduardo Francisco Gleidson da Costa Gastão Lidriana de Souza Pinheiro |
| author_facet | Alexandre Medeiros de Carvalho Vanda Claudino-Sales Sergio Bezerra Lima Junior Leticia Mesquita Eduardo Francisco Gleidson da Costa Gastão Lidriana de Souza Pinheiro |
| author_sort | Alexandre Medeiros de Carvalho |
| collection | DOAJ |
| description | Aeolian features framed as foredunes worldwide, whose classification faces challenges to separate wave-formed from aeolian ridges, are relevant to the context of anthropic control. An example of this kind of morphology, previously classified as foredunes, is arranged along Brazil’s northeastern coast, and the pertinence of its classification as such or even as truly developed dunes was examined. To contribute to the debate on this issue, detailed geomorphological mapping was carried out through UAV and LIDAR surveys, in addition to the multitemporal study of satellite images and aerial photographs. Ground penetration radar sections, trenches, and particle size analysis were also conducted. Although the obliquity of wind direction to the coastline, this study’s main bedform of focus shows coast-parallel positioning conditioned by the exogenous vegetation previously inserted about 70 m from the high tide line. This morphology showed practically no migration for over 15 years; however, the wind breaks through the vegetation barrier and develops depositional lobes and V-shaped low crests protruding into the mainland. GPR sections reveal cross-strata sets with a high dip angle in only two aeolian sequences, one preceding exogenous vegetation introduction and the other in a contemporary layer, amidst the dominance of horizontal to sub-horizontal strata. The sediments are characteristically aeolian, with cross-strata and morphology resembling incipient protodunes and a few stretches at the lee slope highlighting characteristics of retention or precipitation dunes. There was little similarity to the foredunes compared to the other occurrences along the equatorial northeast coast; there was also an inconsistency in the correlation between the cross-strata and the morphological stage. In addition, the disconnection between the aeolian dynamics and morphogenetic process also differentiates it from regional foredunes. This morphology, therefore, presents aspects that are not characteristic of the classification of foredunes or the naturally formed dunes in the region and thus demands a classification to emphasize the anthropogenic character. |
| first_indexed | 2024-03-09T20:10:47Z |
| format | Article |
| id | doaj.art-827b1373dff54e6e8a1480fd5f91a79c |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T20:10:47Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-827b1373dff54e6e8a1480fd5f91a79c2023-11-24T00:17:35ZengMDPI AGGeosciences2076-32632022-09-01121036410.3390/geosciences12100364Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes?Alexandre Medeiros de Carvalho0Vanda Claudino-Sales1Sergio Bezerra Lima Junior2Leticia Mesquita Eduardo3Francisco Gleidson da Costa Gastão4Lidriana de Souza Pinheiro5Instituto de Ciências do Mar-LABOMAR, Universidade Federal do Ceará, Fortaleza 60165-081, BrazilDepartment of Geography Federal University of Ceará, Universidade do Vale do Acaraú (UVA), Sobral 62040-370, BrazilInstituto de Ciências do Mar-LABOMAR, Universidade Federal do Ceará, Fortaleza 60165-081, BrazilInstituto de Ciências do Mar-LABOMAR, Universidade Federal do Ceará, Fortaleza 60165-081, BrazilInstituto de Ciências do Mar-LABOMAR, Universidade Federal do Ceará, Fortaleza 60165-081, BrazilInstituto de Ciências do Mar-LABOMAR, Universidade Federal do Ceará, Fortaleza 60165-081, BrazilAeolian features framed as foredunes worldwide, whose classification faces challenges to separate wave-formed from aeolian ridges, are relevant to the context of anthropic control. An example of this kind of morphology, previously classified as foredunes, is arranged along Brazil’s northeastern coast, and the pertinence of its classification as such or even as truly developed dunes was examined. To contribute to the debate on this issue, detailed geomorphological mapping was carried out through UAV and LIDAR surveys, in addition to the multitemporal study of satellite images and aerial photographs. Ground penetration radar sections, trenches, and particle size analysis were also conducted. Although the obliquity of wind direction to the coastline, this study’s main bedform of focus shows coast-parallel positioning conditioned by the exogenous vegetation previously inserted about 70 m from the high tide line. This morphology showed practically no migration for over 15 years; however, the wind breaks through the vegetation barrier and develops depositional lobes and V-shaped low crests protruding into the mainland. GPR sections reveal cross-strata sets with a high dip angle in only two aeolian sequences, one preceding exogenous vegetation introduction and the other in a contemporary layer, amidst the dominance of horizontal to sub-horizontal strata. The sediments are characteristically aeolian, with cross-strata and morphology resembling incipient protodunes and a few stretches at the lee slope highlighting characteristics of retention or precipitation dunes. There was little similarity to the foredunes compared to the other occurrences along the equatorial northeast coast; there was also an inconsistency in the correlation between the cross-strata and the morphological stage. In addition, the disconnection between the aeolian dynamics and morphogenetic process also differentiates it from regional foredunes. This morphology, therefore, presents aspects that are not characteristic of the classification of foredunes or the naturally formed dunes in the region and thus demands a classification to emphasize the anthropogenic character.https://www.mdpi.com/2076-3263/12/10/364foreduneshuman activitycross-strataanthropic ridge |
| spellingShingle | Alexandre Medeiros de Carvalho Vanda Claudino-Sales Sergio Bezerra Lima Junior Leticia Mesquita Eduardo Francisco Gleidson da Costa Gastão Lidriana de Souza Pinheiro Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? Geosciences foredunes human activity cross-strata anthropic ridge |
| title | Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? |
| title_full | Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? |
| title_fullStr | Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? |
| title_full_unstemmed | Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? |
| title_short | Should Anthropic Ridges Framed as Foredunes Be Considered Real Dunes? |
| title_sort | should anthropic ridges framed as foredunes be considered real dunes |
| topic | foredunes human activity cross-strata anthropic ridge |
| url | https://www.mdpi.com/2076-3263/12/10/364 |
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