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

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

Navegar

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Análise comparativa entre uso e qualidade do solo na área do reservatório da UHE – Tucuruí com base nos atributos físicos e químicos
(Universidade Federal do Pará, 2018-12-21) RAMOS, Jaqueline Pinheiro; VILHENA, Karyme do Socorro de Souza; http://lattes.cnpq.br/3071495983880548
The construction of dams and their reservoirs generates a series of problems, among them, it is mentioned the erosions in the banks of the reservoirs. The soils forming the UHE-Tucuruí region are subject to different uses and occupations that over time have undergone changes with the seasonality of the lake and the increasing use of land, without considering the potentials and limitations of the soil. Some of these areas already show signs of degradation and erosion occurrence points are also identified. The present work seeks to determine the chemical and physical attributes for the evaluation of erodibility in soils located in the reservoir area of Tucuruí Hydroelectric Power Plant. With the selection of native forest, planting and pasture areas, the collected and deformed samples were collected to perform the chemical and physical tests at the Civil Engineering Laboratory of the Federal University of Pará at the Campus Universitário de Tucuruí. After obtaining the results of the physical and chemical properties of the soils can be prescribed the changes caused by the difference of their use and occupation, in the comparative between the areas, the established parameters showed the chemical degradation of the soil and the loss of nutrients that trigger the erosive processes. Multivariate analysis techniques were applied: Principal Component Analysis (PCA) and Hierarchical Grouping Analysis (HCA) to correlate the variables, the understanding of the data set was facilitated and the interrelation between the variables and samples became clearer, From these analyzes, it was possible to determine that the pasture area in the superficial layer is the one that most differs from the others, when considering all the attributes analyzed and the extracted samples, in addition, the multivariate analysis highlighted the information set, which variables are undergoing changes as a consequence of anthropic activity.
Acesso aberto (Open Access)
Estudo da erodibilidade de solos do reservatório da UHE Tucuruí
(Universidade Federal do Pará, 2019-10-30) SILVA, Lucas Manoel da; GOUVEIA, Fernanda Pereira; http://lattes.cnpq.br/1772072130947378; ALENCAR JÚNIOR, Júlio Augusto de; http://lattes.cnpq.br/3663658632717465
The Tucuruí Hydroelectric Power Plant, besides being the 5th largest hydroelectric plant in the world in generating capacity, transfers electric power to several Brazilian states and, having a reservoir of 2,917 km², is strongly subject to erosion. Several studies report the occurrence of erosive features near the its reservoir, besides being constantly subjected to laminar erosive actions in its drainage areas. In this work we carried out bibliographical surveys, field checks and direct and indirect analyzes of the erodibility of samples of the main soils of the Tucuruí HPP reservoir. Indirect analyzes employed semiempirical formulations based on physical and geotechnical characteristics of the, and the direct ones tested undisturbed samples under runoff, exposure to gradual and total water immersion processes, and under intense sample remoulding levels for evaluations in the Tropical Compacted Miniature - M.C.T. It was possible to notice a significant increase in the reservoir territorial occupation, favoring the exposure to erosive processes, and that the samples classified as Pedisol as Ultisol and Yellow Latosol presented average erodibility rates, as 0.0392 and 0.0323 g / cm² / min / Pa and low levels of disaggregation, while Red Latosol presented low erodibility as 0.002 g / cm² / min / Pa, medium to high levels of disaggregation and expansions, in the MCT methodology. These conclusions indicate that the agricutural activity in the area must grow crops that maintain the surface coverage of the first soil areas, and the prevention of uses that may disrupt and damage the last soil.

Navegar

Navegando Dissertações em Engenharia de Barragem e Gestão Ambiental (Mestrado) - PEBGA/NDAE/Tucuruí por CNPq "CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA::MECANICAS DOS SOLOS"