A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil
This work addresses the design and configuration of a Eulerian sediment trap mooring array, which was deployed at the shelf edge (zm ≈ 140 m) 80 km off Cabo Frio, SE- Brazil (23° S). The site was subject to interplay between the Tropical Waters (TW) of the Brazil Current (BC), intrusions from the So...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2014-06-01
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| Series: | Anais da Academia Brasileira de Ciências |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200589&lng=en&tlng=en |
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| author | URSULA MENDOZA ROGÉRIO N. CANDELLA LUIZ P.F. ASSAD FEDERICO V. CASTILLO LAURA AZEVEDO BASTIAAN A. KNOPPERS ANA LUIZA S. ALBUQUERQUE |
| author_facet | URSULA MENDOZA ROGÉRIO N. CANDELLA LUIZ P.F. ASSAD FEDERICO V. CASTILLO LAURA AZEVEDO BASTIAAN A. KNOPPERS ANA LUIZA S. ALBUQUERQUE |
| author_sort | URSULA MENDOZA |
| collection | DOAJ |
| description | This work addresses the design and configuration of a Eulerian sediment trap mooring array, which was deployed at the shelf edge (zm ≈ 140 m) 80 km off Cabo Frio, SE- Brazil (23° S). The site was subject to interplay between the Tropical Waters (TW) of the Brazil Current (BC), intrusions from the South Atlantic Central Waters (SACW), which are the source of upwelling in the region, and other oceanographic processes. Detailed computations were used to optimize the total weight, buoyancy balance, and maximum acceptable tilt to avoid hydrodynamic bias in the trapping efficiency and array adaptation to the local oceanographic conditions with the assistance of Matlab and Muringa programs and Modular Ocean Model 4.0 (MOM; i.e., to assert the vertical distribution of the meridional current component). The velocity range of the current component was determined by short term measurements to be between 0.1 and 0.5 m/s. Projections led to a resulting minimum anchor weight of 456 kg. The necessary line tension was ascertained by using the appropriate distribution of a series of buoys along the array, which finally attained a high vertical load of 350 kg because of the attached oceanographic equipment. Additional flotation devices resulted in a stable mooring array as reflected by their low calculated tilt (2.6° ± 0.6°). A low drag of 16 N was computed for the maximum surface current velocity of 0.5 m/s. The Reynolds number values ranged from 4 × 104 to 2 × 105 and a cone-trap aspect ratio of 1.75 was used to assess the trap sampling efficiency upon exposure to different current velocities. |
| first_indexed | 2024-12-22T15:45:15Z |
| format | Article |
| id | doaj.art-47baee0d8b6b488587c3c13cb47e4939 |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-22T15:45:15Z |
| publishDate | 2014-06-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-47baee0d8b6b488587c3c13cb47e49392022-12-21T18:21:02ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902014-06-0186258960010.1590/0001-37652014107112S0001-37652014000200589A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast BrazilURSULA MENDOZAROGÉRIO N. CANDELLALUIZ P.F. ASSADFEDERICO V. CASTILLOLAURA AZEVEDOBASTIAAN A. KNOPPERSANA LUIZA S. ALBUQUERQUEThis work addresses the design and configuration of a Eulerian sediment trap mooring array, which was deployed at the shelf edge (zm ≈ 140 m) 80 km off Cabo Frio, SE- Brazil (23° S). The site was subject to interplay between the Tropical Waters (TW) of the Brazil Current (BC), intrusions from the South Atlantic Central Waters (SACW), which are the source of upwelling in the region, and other oceanographic processes. Detailed computations were used to optimize the total weight, buoyancy balance, and maximum acceptable tilt to avoid hydrodynamic bias in the trapping efficiency and array adaptation to the local oceanographic conditions with the assistance of Matlab and Muringa programs and Modular Ocean Model 4.0 (MOM; i.e., to assert the vertical distribution of the meridional current component). The velocity range of the current component was determined by short term measurements to be between 0.1 and 0.5 m/s. Projections led to a resulting minimum anchor weight of 456 kg. The necessary line tension was ascertained by using the appropriate distribution of a series of buoys along the array, which finally attained a high vertical load of 350 kg because of the attached oceanographic equipment. Additional flotation devices resulted in a stable mooring array as reflected by their low calculated tilt (2.6° ± 0.6°). A low drag of 16 N was computed for the maximum surface current velocity of 0.5 m/s. The Reynolds number values ranged from 4 × 104 to 2 × 105 and a cone-trap aspect ratio of 1.75 was used to assess the trap sampling efficiency upon exposure to different current velocities.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200589&lng=en&tlng=endesenholinha de fundeioarmadilhas de sedimentaçãoeficiência de capturaressurgência de Cabo FrioSE-Brasil |
| spellingShingle | URSULA MENDOZA ROGÉRIO N. CANDELLA LUIZ P.F. ASSAD FEDERICO V. CASTILLO LAURA AZEVEDO BASTIAAN A. KNOPPERS ANA LUIZA S. ALBUQUERQUE A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil Anais da Academia Brasileira de Ciências desenho linha de fundeio armadilhas de sedimentação eficiência de captura ressurgência de Cabo Frio SE-Brasil |
| title | A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil |
| title_full | A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil |
| title_fullStr | A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil |
| title_full_unstemmed | A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil |
| title_short | A Model Analysis for the Design and Deployment of an Eulerian Sediment Trap Mooring Array in a Western Boundary Upwelling System from Southeast Brazil |
| title_sort | model analysis for the design and deployment of an eulerian sediment trap mooring array in a western boundary upwelling system from southeast brazil |
| topic | desenho linha de fundeio armadilhas de sedimentação eficiência de captura ressurgência de Cabo Frio SE-Brasil |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200589&lng=en&tlng=en |
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