The Lençóis Maranhenses: A Paradise of Dunes and Ponds

Santos, Jorge Hamilton Souza dos; Santos, Nádja Furtado Bessa dos

doi:10.1007/978-94-017-8023-0_8

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…This migration rate appears to be much lower than those set for other sectors of the coastal zone of Ceará state and other states of Northeastern Brazil, as indicated by Maia (1998), Jimenez et al (1999), Carvalho (2003), Castro (2005) and Carvalho et al (2006), Carneiro et al (2012) and Santos and Santos (2015).…”

Section: Resultsmentioning

confidence: 65%

“…This can also be a factor in the compaction of sand and of the reduction of the dune migration rates. and Santos (2015).…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, no measurements have been made to evaluate the extent of the change. Santos, 2015); and, finally, in the state of Rio Grande do Norte, where the dunes migrate with an intensity of at least 23 m/y (Carneiro, Lima, Sá, & Araújo, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Dune migration at Canoa Quebrada, northeast Brazil

Pedrosa¹,

Claudino-Sales²

2023

CLCS

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In the coastal area of Ceará State, northeast Brazil, there are large mobile dunefields, including barchans, barchanoid dunes and sandsheets. The migration rate of these dunes, as measured by several studies, varies between 32 m/y and 9 m/y. This paper analyzes the migration of the dunes in Canoa Quebrada Beach, located in the eastern coast of Ceará State, using remote sensing of aerial photos and satellite imagery from 1988 to 2013 (25 years). The resulting data indicate an average migration rate varying from 1.8 m/y to 9.3 m/y. This is the lowest rate of migration measured for large and undeveloped mobile dunes in Ceará State. The analysis indicates that the element responsible for this low rate is the low wind speed. However, the installation of wind power turbines in the area – which demanded the fixation of part of the dunes to prevent the equipment from being buried and from aeolian erosion – might be another reason for the decreasing dune migration. The dune migration decrease may increase the sedimentary deficit in the coastline downdrift of Canoa Quebrada Beach.

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Section: Resultsmentioning

confidence: 65%

“…This can also be a factor in the compaction of sand and of the reduction of the dune migration rates. and Santos (2015).…”

Section: Resultsmentioning

confidence: 99%

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Dune migration at Canoa Quebrada, northeast Brazil

Pedrosa¹,

Claudino-Sales²

2023

CLCS

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Geomorphology of Maranhão State

Barreto,

Dantas,

Pereira

et al. 2024

The Latin American Studies Book Series

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Where humid and arid meet: Sedimentology of coastal siliciclastic successions deposited in apparently contrasting climates

et al. 2022

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Deciphering the palaeoenvironmental and palaeoclimatic setting of ancient successions that include deposits typical of different climates can be challenging. This is the case in the Late Jurassic succession cropping out in eastern Spain (South-Iberian and western Maestrazgo basins), where deposits characteristic of both arid to semiarid and humid to subhumid settings have been identified through a detailed analysis of eight stratigraphic sections. These sections comprise shallow marine carbonates changing upward and laterally to a predominantly siliciclastic coastal and alluvial succession, including abundant dinosaur remains. Deposition of coastal and alluvial sediments occurred in flood plains, ephemeral and perennial fluvial channels, aeolian dunes, deltas, distributary mouth-bars and associated distributary channels, and shallow water bodies influenced by both fresh and marine waters. Some of these deposits, notably those of aeolian and ephemeral fluvial origin, are characteristic of arid to semiarid climates. However, there are also abundant deposits that can be demonstrably shown to have a coeval origin, which are indicative of permanent water courses: (i) sediments of seasonal discharge fluvial channels with perennial to semi-perennial flow, displaying subcritical and supercritical flow sedimentary structures; (ii) deltaic sediments deposited in permanent freshwater bodies; and (iii) abundant plant and dinosaur remains, especially of herbivorous dinosaurs, which required the presence of permanent water sources and abundant vegetation. These apparently contrasting sedimentary features indicate that deposition occurred under a seasonal climate controlled by monsoonal-type precipitation. These deposits are analogous to those observed nowadays in the Lenc ß ois Maranhenses National Park (north-east Brazil), where a subhumid tropical climate with a seasonal precipitation pattern prevails. Thus, this study shows that only through careful facies analysis and interpretation of depositional processes that can be shown to be occurring concurrently in 975

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The Lençóis Maranhenses: A Paradise of Dunes and Ponds

Cited by 3 publications

References 4 publications

Dune migration at Canoa Quebrada, northeast Brazil

Dune migration at Canoa Quebrada, northeast Brazil

Geomorphology of Maranhão State

Where humid and arid meet: Sedimentology of coastal siliciclastic successions deposited in apparently contrasting climates

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