Determinação das Áreas Atingidas por Queimadas em Bacias Hidrográficas por meio do Índice De Queimada (NBR), Estudo de Caso da Bacia do Rio Piracicaba-MG

Pio, Fernanda Paula Bicalho; Vieira, Eliane Maria

doi:10.26848/rbgf.v13.1.p087-101

Cited by 8 publications

(1 citation statement)

References 28 publications

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“…Por sua vez, índices de vegetação podem ser descritos como uma divisão de bandas espectrais que visa o realce das variações de densidade da cobertura vegetal. As características para a resposta espectral da vegetação estão relacionadas aos parâmetros biofísicos da cobertura vegetal, ou seja, quanto maior for a densidade da cobertura vegetal em uma determinada área, menor será a refletância na região do visível, por outro lado maior será a refletância na região do infravermelho próximo (Pio e Vieira, 2020).…”

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Caracterização de Cicatrizes de Queimadas nas Mesorregiões do Sertão e São Francisco Pernambucano a partir de dados do Sensor MODIS

Gouveia¹,

Nascimento²,

Júnior³

et al. 2021

Rev. Bras. Geog. Fis.

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As mesorregiões do Sertão e São Francisco Pernambucano apresentam clima semiárido, que podem afetar a produção agrícola, em função do clima quente e seco, com temperaturas elevadas e regime pluviométrico irregular. O bioma predominante da região é a Caatinga, que vem sofrendo ao longo dos anos com várias ações antrópicas, incluindo além do desmatamento eventos de queimadas. O objetivo deste artigo foi mapear, caracterizar e quantificar a incidência de focos de calor nas mesorregiões acima relacionadas, bem como a capacidade de recuperação e/ou regeneração natural da vegetação por meio do sensoriamento remoto e técnicas de mineração de dados. Imagens do sensor Moderate Resolution Imaging Spectroradiometer (MODIS) a bordo da plataforma TERRA foram utilizadas para analisar o estado da vegetação nos períodos pré, durante e pós-queima. Para avaliar as condições necessárias para que ocorra a regeneração natural da superfície vegetal foi utilizado o software de mineração de dados Waikato Environment for Knowledge Analysis (WEKA) a partir do cruzamento dos dados do Índice de Vegetação da Diferença Normalizada (NDVI) e precipitação local. Os resultados demonstram um aumento na ocorrência dos focos no período analisado. Existe uma correlação de 91,76% entre o NDVI durante e 48 dias após o evento da queima. Além disso, os parâmetros NDVI 30 e 48 dias após a queima apresentaram um coeficiente de correlação de 83,96%. Portanto, as técnicas de sensoriamento remoto e mineração de dados permitiram avaliar as relações existentes entre o NDVI e a precipitação local para que ocorra a regeneração vegetal. Characterization of Burning Scars in the Sertão and São Francisco Pernambucano Mesoregions from MODIS Sensor dataA B S T R A C T The Sertão and São Francisco Pernambucano mesoregions have a semi-arid climate, which can affect agricultural production, due to the hot and dry climate, with high temperatures and irregular rainfall. The predominant biome of the region is the Caatinga, which has been suffering over the years with several anthropic actions, including in addition to deforestation, burning events. The purpose of this article was to map, characterize and quantify the incidence of hot spots in the mesoregions listed above, as well as the capacity for recovery and / or natural regeneration of vegetation through remote sensing and data mining techniques. Images from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor on the TERRA platform were used to analyze the state of vegetation in the pre, during and post-firing periods. To assess the conditions necessary for the natural regeneration of the plant surface to occur, the data mining software Waikato Environment for Knowledge Analysis (WEKA) was used, by crossing the data from the Normalized Ddifference Vegetation Index (NDVI) and precipitation. The results demostrate an increase in the occurrence of outbreaks in the analyzed period. There is a 91.76% correlation between NDVI during and 48 days after burning event. In addition, the NDVI parameters 30 and 48 days after burning presented a correlation coefficient of 83.96%. Therefore, the techniques of remote sensing and data mining allowed to evaluate the existing relationships between NDVI and local precipitation so that plant regeneration to occurs.Keywords: remote sensing, vegetation indexes, hot spots, data mining.

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Caracterização de Cicatrizes de Queimadas nas Mesorregiões do Sertão e São Francisco Pernambucano a partir de dados do Sensor MODIS

Gouveia¹,

Nascimento²,

Júnior³

et al. 2021

Rev. Bras. Geog. Fis.

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Möglichkeit der Verwendung von Industriekesselasche bei der Dosierung von Bau Beton

Justino¹

2021

Revista Científica Multidisciplinar Núcleo do Conhecimento

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Industrialisierung und beschleunigtes Bevölkerungswachstum haben Nebenwirkungen auf verschiedene soziale Aspekte, und das Umweltproblem ist aufgrund der Auswirkungen der sozialen Evolution besorgniserregend. Die Bewirtschaftung von Industrieabfällen ist eine große Herausforderung, die sowohl die Kontrolle ihrer Erzeugung als auch die ordnungsgemäße Entsorgung umfasst, um die ökologische Nachhaltigkeit zu gewährleisten. Kesselascherückstände finden sich in Hülle und Fülle in Fabriken, die diese Ausrüstung zur Dampferzeugung verwenden. Diese Häufigkeit tritt auf, weil es keinen Ort für die ordnungsgemäße Entsorgung oder Wiederverwendung der Rückstände gibt. Angesichts dieses Szenarios hatte dieser Artikel als Leitfrage: Wäre es möglich, diesen Rückstand bei der Herstellung von Baubeton zu verwenden? Ziel dieser Studie war es, den Rückstand durch Definition seiner möglichen Verwendungsform in der Betondosierung zu klassifizieren und experimentelle Dosierungen unter Verwendung von industrieller Kesselasche durchzuführen, um seine möglichen technischen Beiträge zu den grundlegenden Eigenschaften von Beton zu bewerten. Dazu wurden Proben von einer Industrie gesammelt, die in der Stadt Uberlândia, Bundesstaat Minas Gerais, installiert ist und in verschiedenen Sektoren wie Landwirtschaft, Tierernährung, Pharmazie und anderen tätig ist. Die Klassifizierung von Kesselasche erfolgte unter Anwendung der brasilianischen normativen Verfahren und Parameter, die für die Klassifizierung von Bindemitteln und Zuschlagstoffen für Beton verwendet wurden. Unter Berücksichtigung seiner granulometrischen Kurve und Dichte wurde der Rückstand als leichtes und sehr dünnes Aggregat klassifiziert, wodurch die Methode des teilweisen Ersatzes des dünnen Aggregats durch Kesselasche übernommen wurde. Es wurde nachgewiesen, dass die Verarbeitbarkeit von Beton im frischen Zustand proportional zum verwendeten Rückstandsgehalt verringert wurde. Daher ist es notwendig, in diesen Fällen Superweichmacheradditive zu verwenden, um die erwartete Verarbeitbarkeit zu erhalten. Eine Verringerung der Dichte des Betons wurde bei der Verwendung des Rückstands festgestellt, wobei gegebenenfalls die Aufmerksamkeit auf diese Eigenschaft des Betons in Bezug auf den in der Dosierung verwendeten Rückstandsgehalt zu berücksichtigen war. Auch beim Vergleich der Dosierungen mit der Verwendung des Rückstands bei der Standarddosis wurde beobachtet, dass es zu einer Verringerung der Druckfestigkeit kam. Es gab jedoch keine großen Unterschiede in der Druckfestigkeit zwischen den Dosierungen mit unterschiedlichen Substitutionsstufen. Unter Berücksichtigung der in dieser Studie verwendeten Werte wurde daher die Verwendung dieses Rückstands bei der Herstellung von Baubeton als machbar abgeschlossen.

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Feasibility of using industrial boiler ash in the dosing of structural concrete

Justino¹

2021

Revista Científica Multidisciplinar Núcleo do Conhecimento

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Industrialization and accelerated population growth generate side effects on various social aspects, and the environmental issue is worrisome due to the impacts caused by social evolution. The management of industrial waste is a great challenge that involves both control of its generation and the proper disposal, ensuring environmental sustainability. Boiler ash residue is found in abundance in factories that use this equipment for steam generation. This abundance occurs due to the lack of a place for proper disposal or reuse of the residue. In view of this scenario, this article had as a guide question: Would it be possible to use this residue in the production of structural concrete? The aim of this study was to classify the residue by defining its possible form of use in concrete dosage and to perform experimental dosages with the use of industrial boiler ash to evaluate its possible technical contributions to basic properties of concrete. For this, samples were collected by an industry installed in the city of Uberlândia, State of Minas Gerais, active in several sectors such as agriculture, animal nutrition, pharmaceutical and others. The classification of boiler ash was performed by applying the Brazilian normative procedures and parameters used for classification of binders and aggregates for concrete. Considering its granulometric curve and density, the residue was classified as light and very thin aggregate, thus adopting the methodology of partial replacement of the thin aggregate by boiler ash. It was verified that there was a reduction in the workability of concrete in the fresh state proportionally to the residue content used. Therefore, it is necessary to use superplasticizer additives in these cases to maintain the expected workability. A reduction in the density of concrete was noticed when the residue was used, considering as necessary the attention to this property of the concrete in relation to the content used of the residue in the dosage. It was also observed when comparing the dosages with the use of the residue at the standard dosage, that there was a reduction in compressive strength. However, there was no great variation in compressive strength between the dosages with different substitution levels used. It was concluded, therefore, considering the levels used in this study, as feasible the use of this residue in the production of structural concrete.

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Determinação das Áreas Atingidas por Queimadas em Bacias Hidrográficas por meio do Índice De Queimada (NBR), Estudo de Caso da Bacia do Rio Piracicaba-MG

Cited by 8 publications

References 28 publications

Caracterização de Cicatrizes de Queimadas nas Mesorregiões do Sertão e São Francisco Pernambucano a partir de dados do Sensor MODIS

Caracterização de Cicatrizes de Queimadas nas Mesorregiões do Sertão e São Francisco Pernambucano a partir de dados do Sensor MODIS

Möglichkeit der Verwendung von Industriekesselasche bei der Dosierung von Bau Beton

Feasibility of using industrial boiler ash in the dosing of structural concrete

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