Mestrado Profissional em Engenharia e Desenvolvimento Sustentável
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Navegando Mestrado Profissional em Engenharia e Desenvolvimento Sustentável por Autor "Akabassi, Lucien"
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- ItemAnálise probabilística de incompatibilidade entre a qualidade da água de rios do estado do Espírito Santo e os padrões de enquadramento legal(Universidade Federal do Espírito Santo, 2013-03-22) Guimarães, Brunna Oliveira; Reis, José Antonio Tosta dos; Siman, Renato Ribeiro; Akabassi, LucienThe main objective of this research was the construction and analysis of probabilistic curves of water quality incompatibility of rivers in the state of Espírito Santo and environmental quality standards, viewing the implementation of frameworkasa water resource management tool.The choice of water courses to conduct the present study was based on the availabilityand extension of water-quality data historical series provided by the Moacir Carvalheira de Mendonça Analyses and Environmental Parameters Laboratory, from the Environmentaland Water Resources State Institute.Therefore, the hydrographic basins of the rivers Jucu, Reis Magos, Santa Maria da Vitória and the areaof Rio Doce River pertaining to the state of Espírito Santo were chosen. To discuss the possibilities of framework probabilistic curves of incompatibility to pH parameters, dissolved oxygen, turbidity, total solids, oxygen biochemical demands, total phosphorus andthermotolerant coliforms were used.Considering the monitoring recordsavailable, the results indicated that adoptingdifferentiated frameworksfrom upstream to downstream for the water bodies examined is inadequate. Additionally, hydrological seasonality is relevant tovariations of concentration associated with turbidity, when eventual attempts to classify water courses in class 1 are considered.Any frameworkadopted for the basinsexamined will require relevant efforts to reduce total phosphorus and thermotolerant coliforms concentrations in the planning activities established by the basin plans.
- ItemAplicação do método de Monte Carlo para análise de incerteza na simulação do comportamento dos compostos de nitrogênio em rios(Universidade Federal do Espírito Santo, 2014-12-17) Silva, Tatiana Candeia da; Reis, José Antônio Tosta dos; Akabassi, Lucien; Daniel, RigoNitrogen is a component of major importance regarding generation and its own control of water pollution. At the same time it is an indispensable element for the production of the aquatic ecosystem, it can be the causative agent of several problems related to water quality. Nitrogen in water bodies is presented in many oxidation states and can be found in the forms of organic nitrogen, ammoniacal, nitrite and nitrate. The most important reactions are fixation, ammonification, assimilation, nitrification and denitrification. The research’s main goal is to conduct, with the use of the mathematical model of water quality Qual-UFMG and the Monte Carlo method, a computational simulation of the nitrogen compounds transformations in the last stretch of the Piracicaba River, which is an important affluent of the Doce River. The uncertainty analysis due to using the Monte Carlo method involved the random creation of entry data (hydrodynamic variables, water quality conditions and kinetic constant) with the assistance of regular and uniform distributions of probabilities. Results indicate that, for the variation coefficient values and the percentage of variation, initially assumed for the performance of this present study, the histograms of frequency of maximum values of the different nitrogen compounds concentration are similar when produced with the aid of the regular or uniform distributions in order to randomly create the kinetic constants, hydrodynamic variables and concentrations of nitrogen compounds. From all the variables simulated, the variation coefficient values and the variation percentage are not presented as relevant for Kso (sedimentation coefficient of the organic nitrogen), once the Kso values are usually small when compared to the other coefficient already simulated.
- ItemEstudo comparativo da aplicação do modelo soil and water assessment tool (swat) e métodos usuais de regionalização de vazões mínimas de referência Q90(Universidade Federal do Espírito Santo, 2019-02-26) Ferreira, Thiago Gomes; Rigo, Daniel; Coelho, Edumar Ramos Cabral; Akabassi, LucienEstimating flows in hydrographic basins is a constant problem in hydrological studies and management of water resources. Specifically, when analysing the reference flow Q90, several methodologies are found to determine these values, however, this theoretical path is surrounded by uncertainties and laborious efforts. Eletrobrás is one of the several methods of determination of Q90. It was proposed in 1985 and it has been widely used throughout Brazil. In Espírito Santo authors such as Euclydes et al. (2007) and Ferreira (2010) applied this method to the Timbuí River basin, which consists of a watercourse of significant length and potential for human supply, but it has only one stream gaging station. On the other hand, with the technological advance, methods such as SWAT (Soil and Water Assessment Tool) have been widely used to determine flows in several locations, including Espírito Santo. Therefore, this study aims to analyze the Q90 results obtained through the flow regionalization equations already developed by the authors cited previously and the results from the flow continuity curve obtained from SWAT with an uncalibrated simulation to a region that includes the Valsugana Velha-Montante fluviometric station (sub-basin 115) and to a location near the mouth of the river (sub-basin 207), where there was no monitoring. This study is divided into three steps, the first one is the hydrological modelling with SWAT, which presents the input data of the model (climatic, physiographic and fluviometric variables), the sensitivity analysis of the parameters of the model through the values of p-value and t-stat and the calibration attempts with a Nash-Sutcliffe Coefficient equal to 0.17. The second step is used to determine the Q90 flow rate with SWAT data, where the distribution of the simulated flows between the simulation period (01/01/2007 to 12/31/2015) in a which allowed the determination of the flow rate, which was equal to or exceeded 90% of the time (Q90). Finally, in the third step, the equations of Euclydes et al. (2007) and Ferreira (2010) were applied to the basins studied. As a conclusion, the values obtained by the two methodologies were compared and it was found that the values obtained by the SWAT simulation diverge from those obtained through the regionalization equations for the subbasins. This comparative measure was performed with the aid of Relative Error, a method widely used for comparative analysis in hydrological models.