Dissertações em Engenharia de Barragem e Gestão Ambiental (Mestrado) - PEBGA/NDAE/Tucuruí

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/9396

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Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Análise da influência do uso e ocupação da terra na concentração de sólidos em suspensão em reservatório hidrelétrico com o uso do sensoriamento remoto
(Universidade Federal do Pará, 2022-07-09) SOUZA, Fabíola Esquerdo de; SOARES, Carlos Benedito Santana da Silva; http://lattes.cnpq.br/9153957633685323; ISHIHARA, Júnior Hiroyuki; http://lattes.cnpq.br/3498874642887006; https://orcid.org/0000-0002-0081-7913
The use of remote sensing in reservoir sediment monitoring is important for temporal spac knowledge of sediment deposition in dam structures. In this context, this research was developed in the hydrographic basin that covers the Tucuruí HOU reservoir, in which suspended sediment concentration data from the M1 monitoring station located at 2 km upstream of the dam were acquired, and were integrated into the analyses to understand the relationship between the responses of satellite images and field measurements. Sediment analyses were performed with 14-year time series of MODIS images, composed of 8 days. Surface reflectance estimates were calculated using simplinear regression and coefficient of determination (R2). For the use and occupation of the land of the hydrographic basin, a temporal analysis of Landsat-5, Landsat-8 OLI/TIRS images was performed. Next, the land use and occupation were related to water quality analyses of stations upstream 1 (M1), Amount Repartimento (MR) and Montante Pacurui (MP). The results show that the calibration curve generated the linear regression equation with good fit for MI monitoring station, presenting efficiency in the data estimated by reflectance through this model. The analyses of land use and occupation show that over the years there was a reduction in forest formation and at the same time pasture growth occurred. In relation to water quality, the impacts caused by anthropic actions have negative influences. Thus, it is possible to observe the relevance of the use of remote sensing techniques, geoprocessing and geotechnologies, as instruments that help in the planning of land use and occupation, in the analysis of water quality and management of water resources in reservoir regions, since these technologies enable greater spatial scope of the analyses with lower costs.
Acesso aberto (Open Access)
Análise temporal da cobertura vegetal de um fragmento da RPPN Seringal Triunfo, Ferreira Gomes - Amapá
(Universidade Federal do Pará, 2021-12-27) SCHNEIDER, Juliana Cristina; GODOY, Bruno Spacek; http://lattes.cnpq.br/4036516695601666; https://orcid.org/0000-0001-9751-9885
The construction of dams became necessary for national development, the Amazon region, for having a great hydro-energetic potential, was also used for the construction of these projects. River Araguari's hydrographic basin has three hydroelectric dams (Coaracy Nunes, Ferreira Gomes and Cachoeira Caldeirão) built in its middle course, in the municipality of Ferreira Gomes, however the construction generated several problems, such as loss of territoriality, difficulties in subsistence of villages and the environment modification. However, in 1998, there was the enactment of the Seringal Triunfo National Heritage Private Reserve, which aims to conserve biodiversity. Therefore, there is a need for studies aimed at improving the knowledge of vegetation cover, which have occurred since the enactment of the RPPN. In this sense, the present study sought to understand whether there were changes in the vegetation cover in the RPPN from 2000 to 2015, after its approval and with the construction of UHE Ferreira Gomes and Cachoeira Caldeirão. For this, remote sensing data were used. Twelve images obtained from the TM/Landsat-5, ETM+/Landsat 7 and OLI/Landsat-8 satellites were used, delimiting the study area with the creation of two polygons (buffer), one located within the RPPN and another adjacent with approximately the same size. Digital processing techniques were applied to these images with the aid of pixel counting software. The Normalized Difference Vegetation Index (NDVI) was calculated, making it possible to obtain the median. The obtained results show that the image processing allowed differentiate its constituent elements (vegetal cover and exposed soil). The calculation of the NDVI medians, for the scenes between the years 2000 to 2015, in the area located within the RPPN ranged from 0,37 to 0,64 and the medians of the adjacent area ranged from 0,29 to 0,63, thus, the statistical analysis showed no relationship with the years (F1,10 = 0,02 and P = 0,87), indicating that during the analyzed period there was a stability in the vegetation cover, the same occurred for the adjacent area (F1,10 = 0,11 and P = 0,74). This stability in the area of the RPPN may be related to the role it plays in nature conservation and in the adjacent area to the stagnation of population growth in the municipality. The use of images from remote sensors proved to be a very valuable tool for the present research, even without carrying out an on-site visit, it was possible to calculate the NDVI. Therefore, it is recommended for future work to analyze the NDVI from years prior to 2000, that is, years prior to the approval of the RPPN, as well as on-site visits, for the validation of the components observed in the NDVI, for the NDVI classification to the studied locality.
Acesso aberto (Open Access)
Dinâmica temporal da cobertura vegetal da Comunidade Água Fria na RDS Alcobaça em Tucuruí-PA
(Universidade Federal do Pará, 2021-12-27) SILVA, Renata Albuquerque da; GODOY, Bruno Spacek; http://lattes.cnpq.br/4036516695601666; https://orcid.org/0000-0001-9751-9885
The Tucuruí Hydroelectric Power Plant has great socioeconomic and environmental importance for the southeast region of Pará, due to the formation of its artificial lake, resulting in changes in vegetation cover and loss of biodiversity. This study seeks to understand the dynamics of change in vegetation cover that occurred in the Água Fria Community, RDS Alcobaça, after the filling of the Tucuruí Reservoir, making it possible to understand the changes resulting from deforestation and subsidize proposals for interventions. Digital Image Processing (PDI) techniques were used, divided into stages: Landsat 8, Landsat 7 and Landsat 5 image acquisition; combination of spectral bands (Band 3 and Band 4) and atmospheric correction; NDVI calculation, map production and statistical analysis. To obtain the orbital images, the U.S.G.S. digital platform was used, in the months of July, August and September, from 1990 to 2020, with intervals of two years. The NDVI value showed no relationship with the years, indicating that during the years analyzed there was no significant reduction in the vegetation cover on the ground in the Água Fria community, in the Alcobaça RDS.
Acesso aberto (Open Access)
O uso de Veículos Aéreos Não Tripulados (VANTs) para inspenções de segurança em barragens: estudo exploratório UHE Tucuruí
(Universidade Federal do Pará, 2021-05-28) EL BANNA, Kamila Dias Bernardes; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192
The main objective of this research is to verify the applicability of remote sensing by Unmanned Aerial Vehicles (UAVs), or popularly known as (drones) to aid in the safety of security in hydroelectric dams. It highlights the role and importance of technology as a means of innovation, for this application, as an exploratory study of the UHE Tucuruí. Some signs of deterioration or cracking, for example, can only be identified with visual inspections. For this reason, they are irreplaceable in dam safety control. In this context, the use of the UAV is very useful in these inspections, since its use makes this activity faster and safer, as it allows the verification of regions of the dam that are difficult to access, thus enabling full documentation of the dam's conservation status, in addition to the possibility of adapting sensors of different types and applicability, thus helping to provide more detailed information. The UAV, used for this research, satisfactory results for the evaluations to which it was exposed. Images with adequate quality and sequences were generated, so you can easily observe all the characteristics of the dam surface, thus providing a good support in the operation activities. In addition to supporting the dam safety assessment, the images generated can be gathered and used as a basis for other photographic surveys.

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