Several discussions have arisen about energy from hydroelectric plants being considered clean energy and its reservoirs have been investigated due to the large emission of greenhouse gases (GHG), such as carbon dioxide, methane, and nitrous oxide. The present work shows a statistical study of the diffusive CO2 emissions before the formation of the reservoir of the hydroelectric power plant (HPP) of SINOP, Brazil. The association between emissions collected at the surface (water-air) and at the bottom of the reservoir (sediment-water) was investigated during four data collection campaigns, carried out from November 2017 to September 2018. This study aims to compare the effect of reservoir depth on the diffusive flow of CO2 at 34 collection points. The variable depth analyzed was defined from points collected on the surface and bottom of the reservoir. The objective is to detect whether different periods of time and whether the depth of the reservoir have a direct impact on the behavior of diffusive CO2 emissions. As the measurements of the observational unit are repeatedly observed, there is a multilevel structure, individuals are independent of each other, but there is an intra-individual correlation. Considering this data configuration, an estimation of generalized equations (GEE) was performed, which is a technique that estimates the intra-individual correlation matrix and thus produces estimates for the parameters of the generalized regression models (Generalized Regression Models – GLM) that are not biased. The study showed that the average diffusive CO2 emissions are higher on the reservoir surface. The study also found that, on average, there are more emissions during the rainy season in the region than during the dry season.
Aterros sanitários detêm a maior parcela de disposição final de Resíduos Sólidos Urbanos (RSU) no Brasil. O estudo das propriedades geotécnicas dos RSU contribui para o monitoramento das áreas de disposição, garante sua segurança estrutural e o aumento de vida útil, considerando a heterogeneidade dos resíduos. Este artigo apresenta os resultados do estudo das propriedades geotécnicas de uma amostra de RSU recém-
descartados (1) e RSU aterrados há 5 anos (2), coletadas em um Aterro Sanitário localizado no Sul do Brasil. Foram realizados ensaios de teor de umidade, massa específica e compressão confinada, utilizando como metodologia a teoria de adensamento de solos. Com os ensaios de compressão, foram obtidos os valores de índice de compressão primária para a amostra 1 (0,56 a 1,67) e para a amostra 2 (0,17 a 0,53) e o índice de compressão secundária para amostra 2 (0,006 a 0,004). Este estudo confirmou a aplicabilidade da metodologia de solos para o estudo da compressibilidade de RSU.
Palavras-chave: Resíduos sólidos urbanos. Geotecnia. Adensamento. Ensaios laboratoriais.
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