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242 results on '"Cecílio, Roberto Avelino"'

27. Assessment and characterization of the monthly probabilities of rainfall in Midwest Brazil using different goodness-of-fit tests as probability density functions selection criteria

Author

Abreu, Marcel Carvalho, primary, de Souza, Amaury, additional, Lyra, Gustavo Bastos, additional, de Oliveira-Júnior, José Francisco, additional, Pobocikova, Ivana, additional, de Almeida, Laura Thebit, additional, de Souza Fraga, Micael, additional, Aristone, Flávio, additional, and Cecílio, Roberto Avelino, additional

Published
2022
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33. Random forest for spatialization of daily evapotranspiration (ET0) in watersheds in the Atlantic Forest.

Author

Baratto, Pablo Francisco Benitez, Cecílio, Roberto Avelino, de Sousa Teixeira, David Bruno, Zanetti, Sidney Sara, and Xavier, Alexandre Cândido

Subjects
RANDOM forest algorithms, FOREST restoration, EVAPOTRANSPIRATION, IRRIGATION farming, WATERSHEDS, ANGULAR distance
Abstract

The importance of daily data on reference evapotranspiration (ET0) has increased in recent years due to its relevance in planning and decision making regarding irrigated agriculture, water production, and forest restoration. Facing the scarcity of this information measured in loco, the study of interpolation methods capable of representing ET0 becomes important. Therefore, this study aimed to evaluate the adequacy of the Random Forest (RF) method in the spatialization of ET0 in the watersheds of the Mid-South region of the Espírito Santo State, located within the Atlantic Forest biome, Brazil. From this study, it was found that the RF method is the most suitable one for ET0 spatialization when compared to the Angular distance weighting (ADW) and the inverse distance weighting (IDW) techniques. Also, the spatializations carried out by this method were transformed into databases in a grid format and made available online. Furthermore, the RF database was also compared to other ET0 grid databases, and it was concluded that the RF database also carried out a better performance than the other ones. [ABSTRACT FROM AUTHOR]

Published
2022
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42. Performance Evaluation of Global Climate Models (MCGs) from the IPCC-AR4, in climatic data simulation of air temperature and pluviometric precipitation for South America

Author

Castro, Fábio da Silveira, primary, Xavier, Alexandre Cândido, additional, Cecílio, Roberto Avelino, additional, Pimenta, Luciano Roncetti, additional, Klippel, Valéria Hollunder, additional, Elesbon, Abrahão Alexandre Alden, additional, and Quartezani, Waylson Zancanella, additional

Published
2020
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44. Análise da comportamento espectral da água do Rio Doce, Brasil, mediante o rompimento da barragem de sedimentos da empresa SAMARCO

Author

Alves Ramos, María Camila, Cecílio, Roberto Avelino, Thebit Almeida, Laura, Bernardes Silva, Felipe, de Souza Fraga, Micael, Balieiro Ribeiro, Rayssa, Alves Ramos, María Camila, Cecílio, Roberto Avelino, Thebit Almeida, Laura, Bernardes Silva, Felipe, de Souza Fraga, Micael, and Balieiro Ribeiro, Rayssa

Abstract

A Barragem de Fundão, localizada na Bacia Hidrográfica do Rio Doce, Brasil, destinava-se ao acúmulo de sedimentos das atividades de extração de minério de ferro da empresa SAMARCO. Esta barragem rompeu-se no dia 5 de novembro de 2015, causando enorme desastre ambiental em todos os cursos d’agua à jusante, até atingir o Oceano Atlântico. A lama de rejeitos atingiu o Rio Doce e alterou a qualidade da água para captação e consumo em diversos municípios, sendo um desses o de Governador Valadares (MG). Sabe-se que, dentro das aplicações do sensoriamento remoto para a engenharia, a análise visual e do comportamento espectral dos alvos auxilia a tomada de decisão para a recuperação e o manejo de bacias hidrográficas. Desta forma, analisou-se o comportamento espectral da água e do NDWI (Normalized Difference Water Index) de seis imagens do Landsat 8 para o município de Governador Valadares, sendo duas antes e quatro após o rompimento da barragem (datas 05/08/2014; 25/09/2015; 12/11/2015, 16/02/2016; 10/08/2016 e 10/06/2017). Em escala de 0-1, o pico de reflectância da água antes ao ocorrido (05/08/2014) era da banda do verde, de 0,048. A imagem referente ao dia 12/11/2015, logo após o rompimento, apresentou maior reflectância em todas as bandas, com maior pico na infravermelho próximo (0,48), banda esta correspontente à resposta dos alvos sólidos suspensos na água e vegetação, bem como elevação do NDWI. A reflectância foi reduzida após 8 meses do desastre, entretanto em nenhuma data analisada o comportamento espectral equivaleu-se ao observado antes do desastre ambiental

Published
2019

45. Method for the analysis of the relationship between forest cover and streamflow in watersheds.

Author

Ferraz, Fabrina Teixeira, Zanetti, Sidney Sara, Cecílio, Roberto Avelino, de Carvalho, Dulcinéia, and de Oliveira, Francielle Rodrigues

Subjects
SCIENTIFIC literature, STREAMFLOW, MULTIPLE regression analysis, CLUSTER analysis (Statistics), REGRESSION analysis
Abstract

The relationship between forest cover and streamflow of watersheds is complex and still controversial in the scientific literature. To investigate such relationship we propose an alternative method which requires the following information for each watershed: percentage of forest cover, annual rainfall, average specific streamflow (qave), and minimum mean specific streamflow in seven consecutive days (q7). As a case study, we analyzed a dataset composed by 25 watersheds located in the Espírito Santo State (ESS), Brazil. We conducted simple and multiple linear regression analyses as well as partial correlation analysis between the above parameters. To reduce the effect of heterogeneity of environmental factors, watersheds with similar characteristics in term of rainfall, drainage area, and both rainfall and drainage area were grouped by cluster analysis, and the above regression and correlation analysis was repeated on each group. Our results using the whole dataset showed that forest cover has a negative relationship with watershed streamflow. The analysis of homogeneous groups of watersheds showed that the average minimum streamflow during seven days (q7) was more sensitive to the presence of forest cover, showing a negative relationship, especially in watersheds with low annual rainfall, while in areas with high precipitation, the annual rainfall showed a strong influence on the hydrological responses of watersheds, masking the effect of forest cover. The proposed method may be easily extended to other areas, and allows the inclusion of other relevant environmental variables according to specific cases. [ABSTRACT FROM AUTHOR]

Published
2021
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46. Qualidade da água de nascentes do assentamento Paraíso

Author

Agrizzi, Daniela Vantil, Cecílio, Roberto Avelino, Zanetti, Sidney Sára, Garcia, Giovanni de Oliveira, Do Amaral, Atanásio Alves [UNESP], Firmino, Elziane Favoreto Alves, Mendes, Natalia Gomes de Souza, Faculdade de Venda Nova do Imigrante, Universidade Federal do Espírito Santo (UFES), Universidade Estadual Paulista (Unesp), and UFES

Subjects
Coliforms, Pearson’s correlation, Normative standards, Potability
Abstract

Made available in DSpace on 2018-12-11T16:54:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-05-01. Added 1 bitstream(s) on 2021-07-15T15:02:37Z : No. of bitstreams: 1 S1413-41522018000300557.pdf: 713133 bytes, checksum: 297f8998841db75f89409f496f836c3f (MD5) The objective of this study was to evaluate the influence of land use in the surrounding of the springs on some of the parameters of water quality in eight springs located in the Paraíso settlement in the city of Alegre, Espírito Santo, Brazil. The springs evaluated were: one in the Atlantic forest remnant; six fenced ones and in different stages of forest recovery; and one without a fence and with free livestock access. Three samples of water were collected in each spring in 2011 and 2012, and 17 parameters were analyzed. The determined values were compared to the normative standards for water quality and linearly correlated through the correlation coefficient. Water from the springs showed to be consumable, if previously treated, and the more protected the springs, the better the water quality values. Faculdade de Venda Nova do Imigrante Universidade Federal do Espirito Santo (UFES) Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP) UFES Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP)

Published
2018

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