Papers by Aleska Kaufmann Almeida
Modelo para estimativa de tempo de concentração em bacia hidrográfica não-urbana de região tropical
The time of concentration application in studies around the world: a review
Environmental Science and Pollution Research, 2021
The time of concentration (Tc) is the main hydrological parameter used to characterize the respon... more The time of concentration (Tc) is the main hydrological parameter used to characterize the response of a given Hydrological Response Unit (HRU) to a precipitation event. Because of its importance, the determining Tc is an integral step in several studies involving runoff. Thus, this work presents an unprecedented review of the application of Tc in different lines of research involving water resources around the world. In this article, 1252 publications were listed, obtained from seven different databases, published by 2020, that presented the expressions “time of concentration,” “runoff,” and “watershed.” The articles and conference papers obtained in this research were classified into 12 topics. The number of publications per topic and per country was measured and a cluster analysis was developed to verify the similarity of the distribution of topics per country. In addition, 125 equations applied in related publications for the estimation of Tc are also listed. Graphical abstract ...
Analysis of indicators of surface water pollution in Atlantic Forest preservation areas
Environmental Monitoring and Assessment, 2022
Managing water resources in regions with scarce data, like most developing countries, is still on... more Managing water resources in regions with scarce data, like most developing countries, is still one of the major challenges around the world. Analysis of water quality parameters can provide important information for understanding the current status of water resources and their surroundings, including the changes that have occurred over time. This study aims to evaluate the influence of preservation areas on surface water quality in the Atlantic Forest biome. For this purpose, water quality monitoring sites with a greater number of parameters and longer monitoring time, located in six basins in the Atlantic Forest region of Brazil near preservation areas, were selected. This study employs seven statistical methods, such as cluster and principal component analysis (PCA), and promotes a robust analysis of the pollution of water resources in the Atlantic Forest. The most preserved basins, with more than 87% preservation area, have lower levels of pollution. The second most degraded basin, with 56% preservation area, presents intermediate pollution levels. The most degraded basin has the highest level of pollution. The basin with the lowest area of native vegetation is considered a degraded basin. Finally, non-point sources of pollution from agricultural activities were identified as the main sources of pollution in the region. The cophenetic correlation of 0.97 indicates a good performance of the cluster analysis. In addition, the pre-tests of PCA showed the suitability of the data for performing the test (Bartlett test, < 2.2e-16 and KMO, P= 0.7). The first principal component in the PCA, which accounts for 31.4% of the total variation, is associated with strong ammonia nitrogen and total Kjeldahl nitrogen loads, and moderate biological oxygen demand and nitrite loads. The second component, representing 13.6% of the total variation, indicates periods of self-cleaning of water resources after contamination. The results indicate the importance of maintaining preservation areas in the watershed contribution areas for the improvement of surface water quality in the Atlantic Forest.
MIX Sustentável, 2021
A drenagem urbana sustentável é técnica que visa manter as paisagens naturais e diminuir as áreas... more A drenagem urbana sustentável é técnica que visa manter as paisagens naturais e diminuir as áreas impermeáveis, como ocorre quando da implantação do telhado verde. O telhado verde é uma alternativa a ser considerada para os grandes centros urbanos, consistindo na cobertura vegetal de uma edificação, seja sobre laje ou telhado convencional. Neste trabalho foram investigados aspectos e fatores que podem afetar a qualidade do armazenamento do escoamento superficial do telhado verde, bem como sua contribuição ambiental e econômica. Assim, foram analisadas características externas, como clima e estações do ano, e características internas, relacionadas à estrutura física do telhado. Também foram averiguadas as políticas públicas de incentivo à implementação desse tipo de cobertura. O telhado verde contribui para a gestão da drenagem urbana, auxiliando na captação das águas pluviais, podendo melhorar a qualidade do ar e da água e diminuir a sobrecarga do escoamento.
MIX Sustentável, 2021
It is necessary to know the extreme precipitation occurrences in a region for satisfactory design... more It is necessary to know the extreme precipitation occurrences in a region for satisfactory design of infrastructure projects. Tropical climate regions are characterized by heavy rainfall events during the summer, and, in recent years, as a result of climate change, such events are becoming recurrent. A theoretical probability distribution model is typically used to extrapolate extreme events for high return periods. This study verified if whether probability distribution models are efficient for estimation of extreme precipitation events for the normative recommended return period. Five cities in Mato Grosso do Sul State, in the Midwest region of Brazil, affected by disasters caused by heavy rainfall were adopted as a case study. The results illustrate that the recommendations of the return periods used for the design of hydraulic control structures are insufficient to avoid damage caused by precipitation events, thus lending a high breakdown risk to structures.
Sustainability assessment model for Brazilian hydroelectric projects using multicriteria analysis
Sustainable Energy Technologies and Assessments, 2022
Multicriteria analysis for identification of flood control mechanisms: Application to extreme events in cities of different Brazilian regions
International Journal of Disaster Risk Reduction, 2021
Economic feasibility of a rainwater harvesting system in a residential condominium in the Brazilian Midwest
International Journal of Sustainable Engineering, 2021
Rainwater undergoes various processes before it is suitable for residential use. Moreover, it nee... more Rainwater undergoes various processes before it is suitable for residential use. Moreover, it needs to be sent to a residential distribution reservoir. We investigated and analysed the economic fea...
Acompanhando o constante desenvolvimento da humanidade esta a crescente demanda por energia. Devi... more Acompanhando o constante desenvolvimento da humanidade esta a crescente demanda por energia. Devido a essa necessidade, e de grande valia para o meio ambiente que a energia seja advinda de fontes limpas e renovaveis. Dentre essas fontes, destaca-se o Sol, que a partir de sua radiacao permite a geracao de energia por meio do efeito fotovoltaico. O presente trabalho, atraves de um estudo de caso, teve por objetivo analisar a capacidade de producao de energia de uma Usina Solar Fotovoltaica (USF) conectada a rede, instalada no interior do estado de Mato Grosso do Sul e o tempo de retorno do investimento, na forma de economia de energia e do valor investido em sua implementacao. Foram utilizados tres indicadores como instrumentos de analise do retorno do investimento: payback descontado, valor presente liquido e taxa interna de retorno. Tomando como base o cenario de analise e os valores obtidos pelos indicadores, pode-se concluir que a utilizacao da USF e viavel, pois a Taxa Interna de...
A gestao dos riscos possibilita a minimizacao dos seus impactos nos processos e valores das organ... more A gestao dos riscos possibilita a minimizacao dos seus impactos nos processos e valores das organizacoes, proporcionando beneficios de cunho qualitativo e quantitativo. Na seguranca do trabalho o gerenciamento de risco e essencial, pois visa assegurar a integridade fisica do trabalhador. A vista disso, ressalta-se o conjunto de medidas que tratam da prevencao e combate a incendios. O presente estudo trata das metodologias desenvolvidas para o levantamento dos riscos, destaca os diferentes tipos de dados de entrada, a producao de dados de saida e suas ligacoes. Tem como objetivo principal, discorrer sobre a importância da caracterizacao adequada dos riscos para o sucesso do projeto de seguranca contra incendio. Conclui-se que analise e gestao de riscos sao primordiais para a elaboracao e conducao de todo e qualquer projeto, principalmente para o projeto eficaz de combate a incendio.
Otimização de parâmetros de modelo hidrológico usando pesquisa harmônica
The optimization of rainfall-runoff model parameters as a function of physical and geomorphic fea... more The optimization of rainfall-runoff model parameters as a function of physical and geomorphic features of the hydrological basins makes these models applicable to areas with few or even null data availability. This paper describes a method that uses the Harmony Search algorithm to optimize the parameters of a rainfall-runoff model and obtain watershed hydrographs for areas with unavailable database on water level or discharge database. The streamflow and rainfall data used were obtained from the Aquidauana River Watershed (MS, Brazil). Information on the physical characteristics of the basin was also used to optimize model parameters and evaluate the method. The results obtained were promising, indicating that the method used is efficient and has rapid convergence.
Choosing an appropriate water quality model—a review
Environmental Monitoring and Assessment, 2021
Water quality models are quite complex to use even for scientists, requiring knowledge in differe... more Water quality models are quite complex to use even for scientists, requiring knowledge in different areas such as biology, chemistry, physics, and engineering. Hence, the use of these models by a non-specialist is quite complicated, demanding considerable time and research, particularly to choose which model is the most appropriate for a given situation. In this study, a comparative guide is suggested, which can help users select the appropriate water quality model for certain systems and variables. Five models were considered as follows: AQUATOX, CE-QUAL-W2, Spatially Referenced Regression Model on Watershed Attributes (SPARROW), Soil and Water Assessment Tool (SWAT), and Water Quality Analysis Simulation Program 7 (WASP7), which have been widely used during the last 5 years. All of these selected models are free and easily available. It was verified that each model has its particularities and applications; however, the AQUATOX model has several advantages compared with the other models analyzed. In addition, to illustrate the availability of the proposed comparative guide, a case study was carried out to demonstrating the selection process of the selected models.
Performance analysis of numerical methods for determining Weibull distribution parameters applied to wind speed in Mato Grosso do Sul, Brazil
Sustainable Energy Technologies and Assessments, 2020
Abstract Brazil is one of the countries that invests the most in renewable energy generation. The... more Abstract Brazil is one of the countries that invests the most in renewable energy generation. The share of wind power sources in the Brazilian Electricity Matrix rose from 0.9% in 2012 to 7.6% in 2018. The wind resource assessment is a crucial step in planning a wind energy project. Weibull distribution function is used to determine wind power potential for the investigated site and the distribution parameters are estimated by numerical methods. This study focus on the similarity and analyses of hourly wind speed data series. In this study, six numerical methods (Graphical Method, Maximum Likelihood Method, Modified Maximum Likelihood Method, Moment Method, Empirical Method and Power Density Method) are applied for estimating Weibull distribution parameters in 27 stations in the state of Mato Grosso do Sul, Brazil. The stations were grouped according to the similarity of their data series, and for each group the data series were separated into data series for calibration and data series for the accuracy analysis of the methods. The accuracy of the methods was evaluated using three different statistical analysis techniques. The Maximum Likelihood Method and the Modified Maximum Likelihood Method were the best methods for analyzing most of the data series in the stations.
Applicability of water quality models around the world—a review
Environmental Science and Pollution Research, 2019
Water quality models are important tools used in the management of water resources. The models ar... more Water quality models are important tools used in the management of water resources. The models are usually developed for specific regions, with particular climates and physical characteristics. Thus, applying these models in regions other than those they were designed for can generate large simulation errors. With consideration to these discrepancies, the goal of this study is to identify the models employed in different countries and assist researchers in the selection of the most appropriate models for management purposes. Published studies from the last 21 years (1997–2017) that discuss the application of water quality models were selected from three engineering databases: SpringerLink, Web of Science, and Scopus. Seven models for water quality simulations have been widely applied around the world: AQUATOX, CE-QUAL-W2, EFDC, QUALs, SWAT, SPARROW, and WASP. The countries most frequently applying water quality models are the USA, followed by China, and South Korea. SWAT was the most used model, followed by the QUAL group and CE-QUAL-W2. This study provides the opportunity for researchers, who wish to study countries with fewer cases of applied water quality models, to easily identify the work from that region. Furthermore, this work collated central themes of interest and the most simulated parameters for the seven countries that most frequently employed the water quality models.
Hydrological Sciences Journal, 2017
A recollement is a decomposition of a given category (abelian or triangulated) into two subcatego... more A recollement is a decomposition of a given category (abelian or triangulated) into two subcategories with functorial data that enables the glueing of structural information. This paper is dedicated to investigating the behaviour under glueing of some basic properties of abelian categories (well-poweredness, Grothendieck's axioms AB3, AB4 and AB5, existence of a generator) in the presence of a recollement. In particular, we observe that in a recollement of a Grothendieck abelian category the other two categories involved are also Grothendieck abelian and, more significantly, we provide an example where the converse does not hold and explore multiple sufficient conditions for it to hold.
Water Resources Management, 2016
The time of concentration for a watershed is an essential parameter to the design of any hydrolog... more The time of concentration for a watershed is an essential parameter to the design of any hydrological project. In this study, a time of concentration estimation-model that uses variables obtained by monitoring rainfall-runoff events in a rural watershed of a tropical climate is proposed. In developing the model, the relationship between the time of concentration and independent variables was verified using a linear correlation matrix. Two variables with the highest correlation coefficient were selected to derive a model that can estimate the time of concentration. The Harmony Search (HS) optimization algorithm was employed to optimize the model parameters. The performance of the model was evaluated based on the Nash-Sutcliffe (NS) coefficient, which yielded a value greater than 0.80. The proposed model allows one to estimate the time of concentration using only the hydrograph of an event at the base level of a watershed, without the use of rainfall data.
Study Area Hierarchic cluster analysis (Cluster) Results and Discussion ABSTRACT -The time of con... more Study Area Hierarchic cluster analysis (Cluster) Results and Discussion ABSTRACT -The time of concentration is a fundamental parameter in many hydrological models. Nowadays there is no universally accepted definition for such parameter. However, many definitions and estimation procedures can be found in the technical literature. After an extensive bibliographic review, the current study brings up the variability of empiric methodologies used in its estimations. Thirty empiric methodologies were listed and estimations of time of concentration were performed by applying such methodologies using data from a rural watershed. The hierarchical cluster analysis (Cluster) was applied in order to assess the similarity degree among the selected methodologies. Among all methodologies, Pasini's and Ventura's are the ones that present higher similarity to each other, whereas Pasini and Arizona DOT show stronger dissimilarities to each other.
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Papers by Aleska Kaufmann Almeida