Navegando por Assunto "Hydrodynamic modeling"

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Acesso aberto (Open Access)
Análise dos impactos da dinâmica de sólidos e de nutrientes na qualidade da água de ambiente lêntico utilizado no abastecimento de comunidades amazônicas
(Universidade Federal do Pará, 2012-08) SARAIVA, André Luis de Lima; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
The springs of Utinga, formed by the Bolonha and Água Preta lakes, are contained in an Área de Proteção Ambiental - APA and are used by the Companhia de Saneamento do Pará - COSANPA, to supply the population of the Região Metropolitana de Belém - RMB. These springs are formed by Guamá River, where water is captured and sent to the Água Preta lake by pumping, which in an artificial channel with gravity flow, feeds the Bolonha lake, and since it is pumped to the Estação de Tratamento de Água - ETA. The main problems of pollution / contamination of water sources appeared to advancing urban disordered, giving rise to the improper release of sewage and solid waste from neighborhoods, slums and housing estates close to the main springs. The objective of this study was to use tools to support monitoring and knowledge of water quality in the Água Preta lake, to prevent and / or correct degradation processes. These tools are multivariate analysis of abiotic parameters and chlorophyll a, nutrient balance and hydrodynamic modeling aiming to observe the dispersion of sediment transport. Samples were collected in surface water at three points strategically chosen to assess the anthropogenic influence in the Água Preta lake and sediments that are suspended matter carried into the lake. The sampling points were georeferenced using GPS (GARMIN Model) and the sampling of surface water were performed with the Van Dorn bottle 2.5 L and transported to the Laboratório de Química Ambiental (LQA), located at the Universidade Federal Rural da Amazônia, for further analysis. Samples were collected during the months of March, May, June, August, September and October in 2010, coinciding with periods of higher and lower rainfall. The data of abiotic parameters and chlorophyll a were analyzed by methods of descriptive statistics and principal component analysis. Analyses were also carried out analysis of the mass balance of water and nutrients and adopted the use of hydrodynamic model of the modeling program SisBAHIA (Sistema Base de Hidrodinâmica Ambiental), aimed to mimic the hydrodynamic conditions of the Água Preta lake during a year. Through these simulations were generated maps of surface currents to observe the different patterns of movement, since the use of models have played an important role in planning and development of alternative scenarios that include the proper diagnosis of the water systems in its structure, process and dynamics. The parameters studied showed variations during periods of lower and higher rainfall, higher contribution being found in point 2 in respect of turbidity, color, DO, nitrate, NT, chlorophyll a and suspended solids were found larger contribution in points 2. The other parameters (N -ammonia, BOD and PT) had contribution in points 1 and 3, indicating a source of organic pollution, due to domestic sewage, since there are nearby dumping of sewage. In the mass balance was found that both the PT and NID were influenced by the load of water river Guamá during the lower rainfall. While with high rainfall total phosphorus load was higher due to higher contribution from dewatering of sewage released into the reservoir. The retention time for the PT was 180 days and 536 days was NID. Through this balance could quantify the entry, retention and export of nutrients as well as to evaluate the potential for eutrophication of reservoirs. In the hydrodynamic model showed that the distribution of the module speed was identical for each month of the year, regardless of wind direction, with the riparian vegetation around that water environment this important role in reducing the speed modular surface of the water. However near the output channel of pond water was observed a change of speed 0.32 m /s in the rainy season and 0.28 m / s during the dry period that can be related to the precipitation. Furthermore, the input of water in the tank forms a vortex tending to sedimentation process, a fact observed in the bathymetry. The sedimentation at this point be given especially in periods with lower precipitation, because COSANPA increases the flow of water intake to maintain the level of the reservoir to supply the Região Metropolitana de Belém, providing the greatest contribution of suspended sediment, a fact observed with the parameters of turbidity, color and suspended solids, which have higher concentrations at this point and a decrease as they move away to step 3 (water outlet channel for the connection). These tools are of great importance for maintenance of the spring, since they will allow diagnosing the lake capacity tends of retain and remove nutrients as well as the process of the hydrodynamic circulation allowing check sites that can have a major and minor deposition of materials suspended in water column. Through this study will provide data that subsidizes the competent authorities the future and help in the conservation of other sources used to supply water to cities.
Acesso aberto (Open Access)
Modelagem hidrodinâmica 2DH no furo de Laura - Nordeste Paraense
(Universidade Federal do Pará, 2016-05-23) LOPES, Matheus Santiago; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471
The estuarine environments are widely studied over the past decades due to its social, environmental and economic importance. For example, the strategies to contain oil spill are based on hydrodynamic modeling research. The application of numerical models to predict and analyze circulation patterns inside coastal water bodies is growing in the country. In northern Brazil the use of those models is still experimental. In this work was used the software SisBaHia to implement, calibrate and validate a hydrodynamic model to the water body “furo da Laura” (FL), located on Guajara-Mirin river, on the coastal region of northeastern Pará. The model was calibrated with previous data about surface elevation and current speed collected in three periods: dry season of 2013, rainy season of 2014 and dry season of 2014. The flood and ebb tide flow occurs simultaneously in two entrances that the FL presents. The goal was to locate the barotropic convergence and its seasonal variation. It was simulated one month during the rainy season (February) and one month during the dry season (August). It was simulated a lagrangian transport with particles released in Sol bay with an analysis of its horizontal dispersion. The convergence sites were found nearby the south entrance of the FL and the divergence sites have a spatial variation due the tide cycle. The particles released in the Sol bay tend to leave the modeling domain and don’t penetrate the FL, but they contribute with the erosion and sedimentation process that occurs in coast of the Colares Island.
Acesso aberto (Open Access)
Modelagem hidrodinâmica e estudo morfológico do Lago Água Preta: um dos mananciais da Grande Belém
(Universidade Federal do Pará, 2010) HOLANDA, Patrícia da Silva; BLANCO, Claudio José Cavalcante; http://lattes.cnpq.br/8319326553139808
The natural conditions of water resources can be modified with the unsustainable use of them. For example, in Belém, capital of Pará State, Água Preta Lake has a history of degradation jeopardize the drinking water supply in Belém. Thus, the main contribution of this work is to develop a study on modeling hydrodynamic and morphological study of Água Preta Lake. Such study is carrid out through two data sources. The first is a bathymetric chart to date from 1975. This chart is avaliable in the archives of COSANPA. The second was performed with an ADCP and the dates from 2009. The modeling began with the development of models of terrain elevation to date from 1975 and 2009, also used for the morphological study of the lake. To assemble the hydrodynamic model were needed bathymetrics data, substrates data for the friction model of the underwater relief of the lake to calculate the coefficient of Manning; and boundary conditions. The hydrodynamic simulations, depths and velocities, are performed using the model of Saint-Venant shallow water. The simulated depths were compared to data available in the literature. The simulated depths and velocities and the morphological study were used to analysis water flow pattern and sedimentation trends in the lake.
Acesso aberto (Open Access)
Simulação numérica de derramamento de óleo na foz do rio Amazonas
(Universidade Federal do Pará, 2023-01-30) DEMONER, Sarana Castro; ABREU, Carlos Henrique Medeiros de; http://lattes.cnpq.br/9009261156099636; https://orcid.org/0000-0003-0904-8791; TEIXEIRA, Marcelo Rassy; http://lattes.cnpq.br/8912916360456192
The dynamics of rivers in the Amazon is predominantly linked to threats or natural events that may or may not trigger environmental damage. In March 2013 a large portion of soil slid into the interior of the Santana channel in Amapá, this abrupt mass movement took with it the Port of Santana and its respective facilities. The forensics findings identified a sensitive soil that had not previously been identified in Brazil. Due to the unusual behavior of the material on the shores of the Port of Santana, the new soil characteristics identified and because it is a port area, which houses several materials of great polluting potential, including bulk terminals, pipelines, the need arises to evaluate the behavior of a possible oil spill through hydrodynamic modeling. The software SisBaHiA® - Base System of Environmental Hydrodynamics was chosen to be used in the development of the models because it has a friendly interface and is already widespread in related lines of research. With the models and simulated scenarios, we identified the proportions of a new landslide accident involving these fuel reserves, the areas of the Santana channel that would be directly affected by the oil and what is the response time that the responsible institutions would have to trigger actions for mediation and containment of an accident of this proportion. Thus, the study seeks to obtain timely management mechanisms and decision-making about a possible accident.