Navegando por Autor "COSTA, Francisco Ribeiro da"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Environmental sensitivity index (ESI) mapping of oil spill in the amazon coastal zone: the PIATAM Mar project
(2009) SOUZA FILHO, Pedro Walfir Martins e; PROST, Maria Thereza Ribeiro da Costa; MIRANDA, Fernando Pellon de; SALES, Maria Emília Cruz; BORGES, Heloisa Vargas; COSTA, Francisco Ribeiro da; ALMEIDA, Edson Faria de; NASCIMENTO JUNIOR, Wilson da Rocha
The importance of environmental monitoring is clear from the many oil spills that have occurred over the past three decades. This has encouraged both companies and the public sector involved in the prevention and response to these accidents to develop efficient procedures to minimize the damage caused by accidents involving oil spill. This study reviews the history of oil spill accidents in Brazil and examines how these events have contributed to the development of technological research through partnerships involving oil companies, government, universities and research institutes, with the emphasis on the Amazon coastal zone. As a result, environmental sensitivity indexes (ESIs) for oil spill have been developed specifically for the Amazon coast, where fluvial and marine processes take place in the estuary of the world's largest river system. Perspectives on research and emergency response procedures are presented, with the primary objective of conserving the social-environmental diversity of the planet's most important tropical region.
Acesso aberto (Open Access)
Influência da neotectônica sobre os arranjos geométricos dos aquíferos na Região Metropolitana de Belém – Estado do Pará
(Universidade Federal do Pará, 2004-08-31) COSTA, Francisco Ribeiro da; ABREU, Francisco de Assis Matos de; http://lattes.cnpq.br/9626349043103626
The metropolitan area of Belém (RMB) is located in a distensive segment filled by sedimentary sequences of Pirabas and Barreiras Formations (COSTA et al., 1996) which constitute one of greater ground water reservoir of Brazil (Oliveira, 2003). The aim of this work is to offer information about these aquifers units thorough using data from geology, geometry and cinematic, hydrogeology and morph tectonic, to comprehend the evolution of these units in space and time. Databank used in this work was obtained from: (1) field data; (2) information of well drilling; (3) topographic maps in scal1 1:100,000; (4) Landsat 7 images; (5) SRTM – Shuttle Radar Topographic Mission; and (6) GIS – Geographic Information System of RMB, Guajará and Marajó Bay. Softwares SPRING, Arc View and Global Mapper were used to process and treatment of data and images. Two main scales were used in this study: (1) a regional scale 1:100,000 evolving maps of Belém, Acará and Abaetetuba giving a total of 10,635 km2; and (2) a semi detail scale 1:25,000 adjusted at RMB with total of 1, 929 km2. Morph tectonic analysis showed three geomorphologic domains: Fluvial Plain Terrain, Terrain of Hills and Terrain of Small Mountains. The directions of topographic elements of terrain are compatible with the directions of the drainage net. The analysis of drainage net gave five main basin domains: (1) Coastal; (2) Marapanim River; (3) Guamá River; (4) Acará-Moju River; and (5) Pará River. Thorough this analysis was identified and defined neotectonic elements represented for lineaments from each hydrographic basin, with general directions NE-SW, NW-SE and NNE-SSW in regional scale. The RMB shows main directions in NE-SW and NW-SE with secondary trends WNW-ESE. Using projection and extension of lineaments presents in RMB, was possible to draw a two-dimensional model, which form three-dimensional blocks. Were defined two kinds of sectors based on distinct aspects of blocks. Sector I is located in southeast and Sector II is in northeast portion of RMB. There are kinematics variations in these two sectors. Sector I has dextral moving with stretching direction NW-SE and normal faults NE-SW. In the Sector II the cinematic is sinistral with stretching direction NW-SE and normal faults NE-SW associated. 4 Correlation between water wells located in different blocks proved that geologic layers present in both blocks have distinct attitudes, probably influenced by neotectonic processes. In Sector I, the gradient is moderate 1/180 m/m in the other hand Sector II has gradient 5x bigger 1/30 m/m. The different values on gradient suggest that Sector I and II are distinct with regarding to the slope of layers. With treatment integrated of information obtained was possible to establish the stretching direction for Pirabas-Barreiras Basin in NW-SE. Normal faults related to the development of basin have trends NE-SW. These structures are potential surfaces of low pressure, being favorable places to recharging of aquifers intercepted by its. So it is necessary to be worried about the possibility of pollution in these aquifers by human activity in these places of recharge. Since the recharge areas are exposed to urban or agricultural purposes.
Acesso aberto (Open Access)
Uso de lidar aerotransportado para mapeamento e análise estrutural de depósitos ferríferos na serra sul de Carajás, Amazônia
(Universidade Federal do Pará, 2018-03-29) COSTA, Francisco Ribeiro da; SOUZA FILHO, Pedro Walfir Martins e; http://lattes.cnpq.br/3282736820907252
This research is focused on the definition of methods for the use of Light Detection And Range - LiDAR data in structural geological mapping. In the Amazon Region, in particular in the banded iron formations of the Mineral Province of Carajás - PMC, the vegetal cover compromises the extraction of structural information from optical remote sensing data, since it masks the geomorphological and structural features that can correspond the geological structures . This thesis addressed the application of digital image processing techniques of LiDAR data, from i) shaded relief model - MRS do, which used a configuration with eight lighting modes with different views ranging from 45º between them, to generation of alignment maps; and ii) laplacian filtration in shaded relief model - FLMRS in multidirectional visions. In both resulting maps the same structural trends, NE-SW, NW-SE and secondarily N-S and E-W were observed. However, the map generated from the FLMRS in multidirectional visions presented a better geometry of the spatial distribution of the lineaments. The results obtained from the analysis of LiDAR data were compared with structural data collected and analyzed from the study of iron ore deformation and associated volcanic rocks at the Serra Sul de Carajás mine - S11D. The structural analysis showed a single episode reflecting shortening in the E-W direction, with the installation of two fault systems, one NE-SW direction and the new NW-SE direction. This deformation is responsible for the geometry of the rocks of the S11D plateau, forming a sinformal / antiformal sequence with NE and SE trim along with these fault systems and with axial planes dipping at high angles to NW and NE forming folds with complex interference patterns. Lamination in iron ore still preserves primary structures and there is no evidence of pervasive milonization in these rocks. It proposes a deformational model for the rocks of the S11D Plateau related to transpression controlled by the Carajás Fault during regional sinistral movements. The comparative analysis of the structural maps generated with airborne LiDAR data and traditional manual methods were performed from the comparative of the two maps. The calculation and quantification of the dispersion of the structural contour lines in each area from the different methods showed a correlation coefficient that varied between 0.91 and 0.93, suggesting a good degree of similarity between the mapped structures, although there are variations in the orientation and abundance in the structural contour lines. In general, the results demonstrate the effectiveness of the airborne LiDAR data to extract detailed and accurate structural information on tropical terrain and can be used to complement the fieldbased structural mapping.